{"id":200209,"date":"2023-08-09T03:58:36","date_gmt":"2023-08-08T19:58:36","guid":{"rendered":"https:\/\/www.idc.net\/help\/200209\/"},"modified":"2023-08-09T03:58:36","modified_gmt":"2023-08-08T19:58:36","slug":"%e5%9f%ba%e4%ba%8espritekitswift%e5%bc%80%e5%8f%91%e6%89%93%e7%ab%b9%e5%9d%97%e6%b8%b8%e6%88%8f%ef%bc%88%e4%b8%8b%e7%af%87%ef%bc%89","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/200209\/","title":{"rendered":"\u57fa\u4e8eSpriteKit+Swift\u5f00\u53d1\u6253\u7af9\u5757\u6e38\u620f\uff08\u4e0b\u7bc7\uff09"},"content":{"rendered":"

\u4e00\u3001  \u7b80\u4ecb <\/h2>\n

SpriteKit\u662f\u82f9\u679c\u516c\u53f8\u63a8\u51fa\u7684iOS\u548cOS X\u6e38\u620f\u5f00\u53d1\u6846\u67b6\u3002\u8fd9\u4e2a\u5de5\u5177\u4e0d\u4ec5\u63d0\u4f9b\u4e86\u5f3a\u6709\u529b\u7684\u56fe\u5f62\u529f\u80fd\uff0c\u800c\u4e14\u8fd8\u5305\u62ec\u4e00\u4e2a\u6613\u4e8e\u4f7f\u7528\u7684\u7269\u7406\u5f15\u64ce\u3002\u6700\u91cd\u8981\u7684\u662f\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u4f60\u719f\u6089\u7684\u5de5\u5177 \u2014\u2014Swift\uff0cXcode\u548cInterface Builder\u5b8c\u6210\u6240\u6709\u7684\u5de5\u4f5c\uff01\u4f60\u53ef\u4ee5\u7528SpriteKit\u505a\u5f88\u591a\u7684\u4e8b\u60c5\uff1b\u4f46\u662f\uff0c\u60f3\u4e86\u89e3\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684***\u65b9\u6cd5\u5c31\u662f\u4f7f\u7528\u5b83\u5f00\u53d1\u4e00\u4e2a\u7b80\u5355\u7684\u6e38\u620f\u3002 <\/p>\n

\u5728\u672c\u7cfb\u5217\u6559\u7a0b\uff082\u90e8\u5206\uff09\u4e2d\uff0c\u4f60\u5c06\u8981\u5b66\u4e60\u5982\u4f55\u4f7f\u7528SpriteKit\u6765\u5f00\u53d1\u4e00\u6b3eBreakout\u6e38\u620f\u3002\u5728\u4e0a\u7bc7\u4e2d\uff0c\u6211\u4eec\u5728\u6e38\u620f\u573a\u666f\u4e2d\u6210\u529f\u5730\u6dfb\u4e86\u6321\u677f\u4e0e\u5c0f\u7403\uff1b\u5728\u672c\u7bc7\u4e2d\uff0c\u6211\u4eec\u8981\u5f80\u6e38\u620f\u573a\u666f\u4e2d\u6dfb\u52a0\u7af9\u5757\uff0c\u5e76\u5b9e\u73b0\u6e38\u620f\u7684\u6240\u6709\u5176\u4ed6\u903b\u8f91\u3002 <\/p>\n

\u4e8c\u3001  \u52a0\u5165\u7af9\u5757 <\/h2>\n

\u73b0\u5728\uff0c\u65e2\u7136\u4f60\u5df2\u7ecf\u8ba9\u5c0f\u7403\u8df3\u8dc3\u8d77\u6765\u5e76\u5b9e\u73b0\u4e86\u63a5\u89e6\u65b9\u9762\u7684\u63a7\u5236\uff0c\u90a3\u4e48\u63a5\u4e0b\u6765\u8ba9\u6211\u4eec\u6dfb\u52a0\u4e00\u4e9b\u7af9\u5757\u7528\u4e8e\u5c0f\u7403\u51fb\u6253\u4e4b\u7528\u3002\u6bd5\u7adf\u8fd9\u662f\u4e00\u6b3e\u6253\u7af9\u5757\u6e38\u620f\uff0c\u662f\u4e0d\u662f\uff1f <\/p>\n

\u597d\uff0c\u5207\u6362\u5230\u6587\u4ef6GameScene.swift\uff0c\u7136\u540e\u5728\u65b9\u6cd5didMoveToView(_:)\u4e2d\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\uff1a <\/p>\n

\n \n \n \n 
    \n  \n  \n  \n  
  1. \/\/ 1 <\/span><\/span><\/li>\n  \n  \n  \n  
  2.  <\/span><\/li>\n  \n  \n  \n  
  3. let numberOfBlocks<\/span> = <\/span>8<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  4.  <\/span><\/li>\n  \n  \n  \n  
  5. let blockWidth<\/span> = <\/span>SKSpriteNode<\/span>(imageNamed: \"block\").size.width <\/span><\/span><\/li>\n  \n  \n  \n  
  6.  <\/span><\/li>\n  \n  \n  \n  
  7. let totalBlocksWidth<\/span> = <\/span>blockWidth<\/span> * CGFloat(numberOfBlocks) <\/span><\/span><\/li>\n  \n  \n  \n  
  8.  <\/span><\/li>\n  \n  \n  \n  
  9. \/\/ 2 <\/span><\/li>\n  \n  \n  \n  
  10.  <\/span><\/li>\n  \n  \n  \n  
  11. let xOffset<\/span> = (CGRectGetWidth(frame) - totalBlocksWidth) \/ 2 <\/span><\/span><\/li>\n  \n  \n  \n  
  12.  <\/span><\/li>\n  \n  \n  \n  
  13. \/\/ 3 <\/span><\/li>\n  \n  \n  \n  
  14.  <\/span><\/li>\n  \n  \n  \n  
  15. for i in 0..<<\/span>numberOfBlocks<\/span> { <\/span><\/span><\/li>\n  \n  \n  \n  
  16.  <\/span><\/li>\n  \n  \n  \n  
  17.   let block<\/span> = <\/span>SKSpriteNode<\/span>(imageNamed: \"block.png\") <\/span><\/span><\/li>\n  \n  \n  \n  
  18.  <\/span><\/li>\n  \n  \n  \n  
  19.   block.position<\/span> = <\/span>CGPoint<\/span>(x: xOffset + CGFloat(CGFloat(i) + 0.5) * blockWidth, <\/span><\/span><\/li>\n  \n  \n  \n  
  20.  <\/span><\/li>\n  \n  \n  \n  
  21.     y: CGRectGetHeight(frame) * 0.8) <\/span><\/li>\n  \n  \n  \n  
  22.  <\/span><\/li>\n  \n  \n  \n  
  23.   block.physicsBody<\/span> = <\/span>SKPhysicsBody<\/span>(rectangleOfSize: block.frame.size) <\/span><\/span><\/li>\n  \n  \n  \n  
  24.  <\/span><\/li>\n  \n  \n  \n  
  25.   block.physicsBody!.allowsRotation<\/span> = <\/span>false<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  26.  <\/span><\/li>\n  \n  \n  \n  
  27.   block.physicsBody!.friction<\/span> = <\/span>0<\/span>.0 <\/span><\/span><\/li>\n  \n  \n  \n  
  28.  <\/span><\/li>\n  \n  \n  \n  
  29.   block.physicsBody!.affectedByGravity<\/span> = <\/span>false<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  30.  <\/span><\/li>\n  \n  \n  \n  
  31.   block.physicsBody!.dynamic<\/span> = <\/span>false<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  32.  <\/span><\/li>\n  \n  \n  \n  
  33.   block.name<\/span> = <\/span>BlockCategoryName<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  34.  <\/span><\/li>\n  \n  \n  \n  
  35.   block.physicsBody!.categoryBitMask<\/span> = <\/span>BlockCategory<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  36.  <\/span><\/li>\n  \n  \n  \n  
  37.   block.zPosition<\/span> = <\/span>2<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
  38.  <\/span><\/li>\n  \n  \n  \n  
  39.   addChild(block) <\/span><\/li>\n  \n  \n  \n  
  40.  <\/span><\/li>\n  \n  \n  \n  
  41. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
    \u6b64\u4ee3\u7801\u5728\u5c4f\u5e55\u4e0a\u5c06\u521b\u5efa\u5c45\u4e2d\u7684\u516b\u5757\u7af9\u5757\u3002\u5177\u4f53\u6765\u8bf4\uff0c\u4e0a\u9762\u4ee3\u7801\u6bb5\u5b9e\u73b0\u4e86\uff1a <\/p>\n
    \uff081\uff09\u5efa\u7acb\u4e86\u4e00\u4e9b\u6709\u7528\u7684\u5e38\u91cf\uff0c\u7528\u4e8e\u4fdd\u5b58\u7af9\u5757\u6570\u91cf\u53ca\u5bbd\u5ea6\u503c\u7b49\u3002 <\/p>\n
    \uff082\uff09\u8ba1\u7b97x\u504f\u79fb\u91cf\uff0c\u5b83\u5bf9\u5e94\u4e8e\u5c4f\u5e55\u7684\u5de6\u8fb9\u6846\u548c***\u4e2a\u7af9\u5757\u4e4b\u95f4\u7684\u8ddd\u79bb\u3002\u8fd9\u91cc\u4f7f\u7528\u5c4f\u5e55\u5bbd\u5ea6\u51cf\u53bb\u6240\u6709\u7af9\u5757\u7684\u5bbd\u5ea6\uff0c\u7136\u540e\u9664\u4ee52\u6765\u8ba1\u7b97\u3002 <\/p>\n
    \uff083\uff09\u521b\u5efa\u7af9\u5757\u5e76\u914d\u7f6e\u6bcf\u4e2a\u7af9\u5757\u9002\u5f53\u7684\u7269\u7406\u5c5e\u6027\uff0c\u5e76\u4f7f\u7528 blockWidth\u548cxOffset\u53d8\u91cf\u6765\u5b89\u6392\u6bcf\u4e00\u4e2a\u7684\u4f4d\u7f6e\u3002 <\/p>\n
    \u73b0\u5728\uff0c\u6784\u5efa\u5e76\u8fd0\u884c\u4e00\u4e0b\u4f60\u7684\u6e38\u620f\uff0c\u5e76\u6ce8\u610f\u89c2\u5bdf\uff01\u8bf7\u53c2\u8003\u4e0b\u56fe\u3002 <\/p>\n
    \n
    \u73b0\u5728\uff0c\u7af9\u5757\u5df2\u5230\u4f4d\u3002\u4f46\u662f\uff0c\u4e3a\u4e86\u76d1\u542c\u5c0f\u7403\u548c\u7af9\u5757\u4e4b\u95f4\u7684\u78b0\u649e\uff0c\u4f60\u5fc5\u987b\u66f4\u65b0\u5c0f\u7403\u7684 contactTestBitMask\u63a9\u7801\u3002\u4ecd\u7136\u5728 GameScene.swift\u6587\u4ef6\u4e2d\uff0c\u7f16\u8f91didMoveToView(_:)\u65b9\u6cd5\u4e2d\u73b0\u6709\u7684\u4ee3\u7801\u884c\u5373\u53ef\u2014\u2014\u5411\u5b83\u6dfb\u52a0\u4e00\u4e2a\u989d\u5916\u7684\u7c7b\u522b\uff1a <\/p>\n
    \n \n \n \n 
      \n  \n  \n  \n  
    1. ball.physicsBody!<\/span>.contactTestBitMask<\/span> = <\/span>BottomCategory<\/span> | BlockCategory <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
      \u4e0a\u8ff0\u4ee3\u7801\u6267\u884c\u4e86BottomCategory\u548cBlockCategory\u4e24\u4e2a\u63a9\u7801\u95f4\u7684\u6309\u4f4d\u6216\u64cd\u4f5c\u3002\u5176\u7ed3\u679c\u662f\uff0c\u8fd9\u4e24\u4e2a\u7279\u5b9a\u7c7b\u522b\u7684\u4f4d\u90fd\u8bbe\u7f6e\u4e3a1\uff0c\u800c\u6240\u6709\u5176\u4ed6\u4f4d\u4ecd\u5747\u4e3a\u96f6\u3002\u73b0\u5728\uff0c\u7403\u4e0e\u5730\u677f\u4ee5\u53ca\u7403\u548c\u5757\u4e4b\u95f4\u7684\u78b0\u649e\u4fe1\u606f\u90fd\u4f1a\u88ab\u53d1\u9001\u7ed9\u4ee3\u7406\u4ee5\u4fbf\u8fdb\u4e00\u6b65\u5904\u7406\u3002 <\/p>\n
       \u4e09\u3001  \u6253\u7af9\u5757 <\/h2>\n
      \u73b0\u5728\uff0c\u4f60\u5df2\u7ecf\u51c6\u5907\u597d\u5757\u4e0e\u7403\u4e4b\u95f4\u7684\u78b0\u649e\u68c0\u6d4b\u4e86\u3002\u8ba9\u6211\u4eec\u5c06\u4e00\u4e2a\u5e2e\u52a9\u65b9\u6cd5\u6dfb\u52a0\u5230 GameScene.swift\u6587\u4ef6\u4e2d\uff0c\u4ee5\u4fbf\u5b9e\u73b0\u4ece\u573a\u666f\u4e2d\u5220\u9664\u7af9\u5757\uff1a <\/p>\n
      \n \n \n \n 
        \n  \n  \n  \n  
      1. func breakBlock(node: SKNode) { <\/span><\/span><\/li>\n  \n  \n  \n  
      2.  <\/span><\/li>\n  \n  \n  \n  
      3.   let particles<\/span> = <\/span>SKEmitterNode<\/span>(fileNamed: \"BrokenPlatform\")! <\/span><\/span><\/li>\n  \n  \n  \n  
      4.  <\/span><\/li>\n  \n  \n  \n  
      5.   particles.position<\/span> = <\/span>node<\/span>.position <\/span><\/span><\/li>\n  \n  \n  \n  
      6.  <\/span><\/li>\n  \n  \n  \n  
      7.   particles.zPosition<\/span> = <\/span>3<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
      8.  <\/span><\/li>\n  \n  \n  \n  
      9.   addChild(particles) <\/span><\/li>\n  \n  \n  \n  
      10.  <\/span><\/li>\n  \n  \n  \n  
      11.   particles.runAction(SKAction.sequence([SKAction.waitForDuration(1.0), SKAction.removeFromParent()])) <\/span><\/li>\n  \n  \n  \n  
      12.  <\/span><\/li>\n  \n  \n  \n  
      13.   node.removeFromParent() <\/span><\/li>\n  \n  \n  \n  
      14.  <\/span><\/li>\n  \n  \n  \n  
      15. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
        \u6b64\u65b9\u6cd5\u4f7f\u7528\u4e86\u53c2\u6570SKNode\u3002\u9996\u5148\uff0c\u5b83\u4ece BrokenPlatform.sks \u6587\u4ef6\u4e2d\u521b\u5efaSKEmitterNode\u7684\u4e00\u4e2a\u5b9e\u4f8b\uff0c\u7136\u540e\u5c06\u5b83\u7684\u4f4d\u7f6e\u8bbe\u7f6e\u4e3a\u8be5\u8282\u70b9\u76f8\u540c\u7684\u4f4d\u7f6e\u3002\u53d1\u5c04\u5668\u8282\u70b9\u7684 zPosition \u8bbe\u7f6e\u4e3a 3\uff1b\u8fd9\u6837\uff0c\u7c92\u5b50\u5c31\u80fd\u591f\u663e\u793a\u5728\u5269\u4f59\u7684\u7af9\u5757\u4e0a\u9762\u3002\u628a\u7c92\u5b50\u6dfb\u52a0\u5230\u573a\u666f\u540e\uff0c\u8282\u70b9\uff08\u7af9\u5757\uff09\u5c06\u88ab\u5220\u9664\u3002 <\/p>\n
        \uff3b\u6ce8\u610f\uff3d\u53d1\u5c04\u5668\u8282\u70b9\u662f\u4e00\u79cd\u7279\u6b8a\u7c7b\u578b\u7684\u8282\u70b9\uff0c\u5b83\u7528\u4e8e\u663e\u793a\u5728\u573a\u666f\u7f16\u8f91\u5668\u4e2d\u521b\u5efa\u7684\u7c92\u5b50\u7cfb\u7edf\u3002\u82e5\u8981\u68c0\u67e5\u5b83\u662f\u5982\u4f55\u914d\u7f6e\u7684\uff0c\u4f60\u53ef\u4ee5\u6253\u5f00\u6587\u4ef6BrokenPlatform.sks\uff0c\u8fd9\u662f\u6211\u4e3a\u672c\u6559\u7a0b\u4e13\u95e8\u521b\u5efa\u7684\u7c92\u5b50\u7cfb\u7edf\u3002 <\/p>\n
        \u5269\u4e0b\u8981\u505a\u7684\u552f\u4e00\u4e8b\u60c5\u662f\u6839\u636e\u60c5\u51b5\u76f8\u5e94\u5730\u5904\u7406\u59d4\u6258\u901a\u77e5\u3002\u5728didBeginContact(_:) \u7684\u672b\u5c3e\u6dfb\u52a0\u4ee5\u4e0b\u5185\u5bb9\uff1a <\/p>\n
        \n \n \n \n 
          \n  \n  \n  \n  
        1. if <\/span>firstBody.categoryBitMask<\/span> == BallCategory && <\/span>secondBody.categoryBitMask<\/span> == BlockCategory { <\/span><\/span><\/li>\n  \n  \n  \n  
        2.  <\/span><\/li>\n  \n  \n  \n  
        3.   breakBlock(secondBody.node!) <\/span><\/li>\n  \n  \n  \n  
        4.  <\/span><\/li>\n  \n  \n  \n  
        5.   \/\/TODO: check if the game has been won <\/span><\/li>\n  \n  \n  \n  
        6.  <\/span><\/li>\n  \n  \n  \n  
        7. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
          \u4e0a\u9762\u8fd9\u4e9b\u4ee3\u7801\u884c\u68c0\u67e5\u662f\u5426\u5c0f\u7403\u548c\u7af9\u5757\u95f4\u5b58\u5728\u78b0\u649e\u3002\u5982\u679c\u662f\u8fd9\u6837\uff0c\u4f60\u5c06\u8282\u70b9\u4f20\u9012\u7ed9 breakBlock(_:) \u65b9\u6cd5\u5e76\u968f\u7740\u64ad\u653e\u7c92\u5b50\u52a8\u753b\u4ece\u573a\u666f\u4e2d\u5220\u9664\u7af9\u5757\uff01 <\/p>\n
          \u73b0\u5728\uff0c\u751f\u6210\u5e76\u8fd0\u884c\u5de5\u7a0b\u3002\u4f60\u4f1a\u6ce8\u610f\u5230\u5f53\u5c0f\u7403\u51fb\u4e2d\u7af9\u5757\u65f6\u7af9\u5757\u5e94\u8be5\u5206\u5f00\u3002 <\/p>\n
          \n
           \u56db\u3001  \u6e38\u620f\u63a7\u5236\u903b\u8f91 <\/h2>\n
          \u73b0\u5728\uff0c\u4f60\u5df2\u7ecf\u521b\u5efa\u4e86\u6253\u7af9\u5757\u6e38\u620f\u6240\u9700\u8981\u7684\u6240\u6709\u5143\u7d20\uff0c\u8f6e\u5230\u73a9\u5bb6\u4f53\u9a8c\u4e00\u4e0b\u6fc0\u52a8\u4eba\u5fc3\u7684\u80dc\u5229\u6216\u662f\u5931\u8d25\u7684\u75db\u82e6\u7684\u65f6\u5019\u4e86\uff01 <\/p>\n
          \uff08\u4e00\uff09\u6784\u5efa\u72b6\u6001\u673a <\/h3>\n
          \u5927\u591a\u6570\u6e38\u620f\u903b\u8f91\u53d7\u6e38\u620f\u7684\u5f53\u524d\u72b6\u6001\u6240\u63a7\u5236\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6e38\u620f\u662f\u5728\u201c\u4e3b\u83dc\u5355\u201d\u72b6\u6001\u4e0b\uff0c\u90a3\u4e48\u73a9\u5bb6\u5c31\u4e0d\u80fd\u79fb\u52a8\uff0c\u4f46\u5982\u679c\u6e38\u620f\u662f\u5728\u201c\u64ad\u653e\u201d\u72b6\u6001\uff0c\u73a9\u5bb6\u5e94\u8be5\u80fd\u79fb\u52a8\u3002 <\/p>\n
          \u5927\u91cf\u7684\u7b80\u5355\u6e38\u620f\u90fd\u662f\u901a\u8fc7\u4f7f\u7528\u5e03\u5c14\u578b\u53d8\u91cf\u5e76\u7ed3\u5408\u66f4\u65b0\u5faa\u73af\u6765\u7ba1\u7406\u6e38\u620f\u72b6\u6001\u3002\u901a\u8fc7\u4f7f\u7528\u72b6\u6001\u673a\uff0c\u968f\u7740\u4f60\u7684\u6e38\u620f\u53d8\u5f97\u66f4\u52a0\u590d\u6742\u4f60\u53ef\u4ee5\u66f4\u597d\u5730\u7ec4\u7ec7\u4ee3\u7801\u3002 <\/p>\n
          \u4e00\u4e2a\u72b6\u6001\u673a\u7528\u6765\u7ba1\u7406\u4e00\u7ec4\u72b6\u6001\u3002\u5176\u4e2d\uff0c\u53ea\u6709\u4e00\u4e2a\u5f53\u524d\u72b6\u6001\uff0c\u5e76\u4e14\u6709\u4e00\u5957\u89c4\u5219\u7528\u4e8e\u72b6\u6001\u4e4b\u95f4\u7684\u8fc7\u6e21\u3002\u968f\u7740\u6e38\u620f\u72b6\u6001\u7684\u53d8\u5316\uff0c\u5728\u9000\u51fa\u524d\u4e00\u4e2a\u72b6\u6001\u5e76\u8fdb\u5165\u4e0b\u4e00\u72b6\u6001\u65f6\u72b6\u6001\u673a\u90fd\u4f1a\u8fd0\u884c\u67d0\u4e9b\u65b9\u6cd5\u3002\u8fd9\u4e9b\u65b9\u6cd5\u53ef\u7528\u4e8e\u4ece\u6bcf\u4e2a\u72b6\u6001\u5185\u90e8\u6765\u63a7\u5236\u6e38\u620f\u3002\u5728\u72b6\u6001\u66f4\u6539\u6210\u529f\u540e\uff0c\u72b6\u6001\u673a\u5c06\u6267\u884c\u5f53\u524d\u72b6\u6001\u7684\u66f4\u65b0\u5faa\u73af\u3002 <\/p>\n
          \n
          \u82f9\u679c\u516c\u53f8\u5728iOS 9\u4e2d\u63a8\u51fa\u4e86GameplayKit\u6846\u67b6\uff0c\u6b64\u6846\u67b6\u5185\u7f6e\u652f\u6301\u72b6\u6001\u673a\uff0c\u4ece\u800c\u4f7f\u4f7f\u7528\u72b6\u6001\u673a\u7684\u5de5\u4f5c\u975e\u5e38\u5bb9\u6613\u3002\u6709\u5173GameplayKit\u7684\u4f7f\u7528\u7ec6\u8282\uff0c\u5df2\u7ecf\u8d85\u51fa\u4e86\u672c\u6559\u7a0b\u7684\u8303\u56f4\uff1b\u4f46\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u4f60\u5c06\u4f7f\u7528\u5176\u4e2d\u7684\u4e24\u4e2a\u7c7b\uff1aGKStateMachine \u548c GKState \u7c7b\u3002 <\/p>\n
          \uff08\u4e8c\uff09\u6dfb\u52a0\u72b6\u6001 <\/h3>\n
          \u5728\u6211\u4eec\u7684\u6253\u7af9\u5757\u6e38\u620f\u4e2d\uff0c\u5171\u6709\u4e09\u79cd\u6e38\u620f\u72b6\u6001\uff1a <\/p>\n
            \n
          • WaitingForTap\uff1a\u610f\u5473\u7740\u6e38\u620f\u5df2\u5b8c\u6210\u52a0\u8f7d\u5e76\u51c6\u5907\u5f00\u59cb\u542f\u52a8\u3002 <\/li>\n
          • Playing\uff1a\u5904\u4e8e\u73a9\u6e38\u620f\u72b6\u6001\u3002 <\/li>\n
          • GameOver\uff1a\u6e38\u620f\u7ed3\u675f\uff08\u6216\u8005\u8f93\u6216\u8005\u8d62\uff09\u3002 <\/li>\n<\/ul>\n
            \u4e3a\u4e86\u8282\u7701\u65f6\u95f4\uff0c\u5df2\u7ecf\u6709\u4e09\u4e2a GKState \u7c7b\u6dfb\u52a0\u5230\u9879\u76ee\u4e2d\uff08\u5982\u679c\u597d\u5947\u7684\u8bdd\uff0c\u4f60\u53ef\u4ee5\u67e5\u770b\u4e00\u4e0bGame States\u7ec4\uff09\u3002\u4e3a\u4e86\u521b\u5efa\u72b6\u6001\u673a\uff0c\u9996\u5148\u5728 GameScene.swift \u6587\u4ef6\u7684\u9876\u90e8\u6dfb\u52a0\u4ee5\u4e0b\u7684\u5bfc\u5165\u8bed\u53e5\uff1a <\/p>\n
            \n \n \n \n 
              \n  \n  \n  \n  
            1. import GameplayKit <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
              \u63a5\u4e0b\u6765\uff0c\u5728\u8bed\u53e5var isFingerOnPaddle = false:\u4e0b\u9762\u63d2\u5165\u8fd9\u4e2a\u7c7b\u53d8\u91cf\uff1a <\/p>\n
              \n \n \n \n 
                \n  \n  \n  \n  
              1. lazy var gameState: <\/span>GKStateMachine<\/span>GKStateMachine<\/span> = GKStateMachine(states: [ <\/span><\/span><\/li>\n  \n  \n  \n  
              2.  <\/span><\/li>\n  \n  \n  \n  
              3.   WaitingForTap(scene: self), <\/span><\/li>\n  \n  \n  \n  
              4.  <\/span><\/li>\n  \n  \n  \n  
              5.   Playing(scene: self), <\/span><\/li>\n  \n  \n  \n  
              6.  <\/span><\/li>\n  \n  \n  \n  
              7.   GameOver(scene: self)]) <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                \u901a\u8fc7\u5b9a\u4e49\u6b64\u53d8\u91cf\uff0c\u4f60\u53ef\u4ee5\u6709\u6548\u5730\u521b\u5efa\u6253\u7af9\u5757\u6e38\u620f\u7684\u72b6\u6001\u673a\u3002\u6ce8\u610f\uff1a\u4f60\u6b63\u5728\u4f7f\u7528GKState\u5b50\u7c7b\u6570\u7ec4\u521d\u59cb\u5316 GKStateMachine\u3002 <\/p>\n
                \uff08\u4e09\uff09\u5b9e\u73b0WaitingForTap\u72b6\u6001 <\/h3>\n
                WaitingForTap\u72b6\u6001\u610f\u5473\u7740\u6e38\u620f\u5df2\u5b8c\u6210\u52a0\u8f7d\u5e76\u51c6\u5907\u5f00\u59cb\u542f\u52a8\u4e86\u3002\u73a9\u5bb6\u5728\u5c4f\u5e55\u4e0a\u4f1a\u770b\u5230\u201cTap to Play\u201d\u7684\u63d0\u793a\uff0c\u5728\u6e38\u620f\u8fdb\u5165\u64ad\u653e\u72b6\u6001\u4e4b\u524d\u5c06\u7b49\u5f85\u89e6\u6478\u4e8b\u4ef6\u3002 <\/p>\n
                \u73b0\u5728\uff0c\u5728didMoveToView(_:) \u65b9\u6cd5\u7684\u672b\u5c3e\u6dfb\u52a0\u4ee5\u4e0b\u4ee3\u7801\ufe30 <\/p>\n
                \n \n \n \n 
                  \n  \n  \n  \n  
                1. let <\/span>gameMessage<\/span> = <\/span>SKSpriteNode<\/span>(imageNamed: \"TapToPlay\") <\/span><\/span><\/li>\n  \n  \n  \n  
                2.  <\/span><\/li>\n  \n  \n  \n  
                3. gameMessage.name<\/span> = <\/span>GameMessageName<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                4.  <\/span><\/li>\n  \n  \n  \n  
                5. gameMessage.position<\/span> = <\/span>CGPoint<\/span>(x: CGRectGetMidX(frame), y: CGRectGetMidY(frame)) <\/span><\/span><\/li>\n  \n  \n  \n  
                6.  <\/span><\/li>\n  \n  \n  \n  
                7. gameMessage.zPosition<\/span> = <\/span>4<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                8.  <\/span><\/li>\n  \n  \n  \n  
                9. gameMessage.setScale(0.0) <\/span><\/li>\n  \n  \n  \n  
                10.  <\/span><\/li>\n  \n  \n  \n  
                11. addChild(gameMessage) <\/span><\/li>\n  \n  \n  \n  
                12.  <\/span><\/li>\n  \n  \n  \n  
                13. gameState.enterState(WaitingForTap) <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                  \u8fd9\u5c06\u521b\u5efa\u663e\u793a\u201cTap to Play\u201d\u7684\u63d0\u793a\u6d88\u606f\uff0c\u540e\u6765\u5b83\u4e5f\u5c06\u7528\u4e8e\u663e\u793a\u201cGame Over\u201d\u6d88\u606f\u3002\u63a5\u4e0b\u6765\uff0c\u4f60\u9700\u8981\u544a\u8bc9\u72b6\u6001\u673a\u8fdb\u5165 WaitingForTap \u72b6\u6001\u3002 <\/p>\n
                  \u5728 didMoveToView(_:)\u65b9\u6cd5\u4e2d\uff0c\u4f60\u8fd8\u8981\u5220\u9664\u5982\u4e0b\u4e00\u884c\uff1a <\/p>\n
                  \n \n \n \n 
                    \n  \n  \n  \n  
                  1. ball.physicsBody!.applyImpulse(CGVector(dx: 2.0, dy: -2.0)) \/\/ REMOVE <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                    \u7a0d\u540e\uff0c\u5728\u672c\u6559\u7a0b\u4e2d\uff0c\u4f60\u9700\u8981\u628a\u8fd9\u6bb5\u4ee3\u7801\u79fb\u52a8\u5230\u6e38\u620f\u64ad\u653e\u72b6\u6001\u5904\u3002 <\/p>\n
                    \u73b0\u5728\uff0c\u6253\u5f00 WaitingForTap.swift \u6587\u4ef6\u3002\u4f7f\u7528\u5982\u4e0b\u4ee3\u7801\u66ff\u6362DidEnterWithPreviousState(_:)\u65b9\u6cd5\u548c willExitWithNextState(_:)\u65b9\u6cd5\ufe30 <\/p>\n
                    \n \n \n \n 
                      \n  \n  \n  \n  
                    1. override func didEnterWithPreviousState(previousState: GKState?) { <\/span><\/span><\/li>\n  \n  \n  \n  
                    2.  <\/span><\/li>\n  \n  \n  \n  
                    3.   let scale<\/span> = <\/span>SKAction<\/span>.scaleTo(1.0, duration: 0.25) <\/span><\/span><\/li>\n  \n  \n  \n  
                    4.  <\/span><\/li>\n  \n  \n  \n  
                    5.   scene.childNodeWithName(GameMessageName)!.runAction(scale) <\/span><\/li>\n  \n  \n  \n  
                    6.  <\/span><\/li>\n  \n  \n  \n  
                    7. } <\/span><\/li>\n  \n  \n  \n  
                    8.  <\/span><\/li>\n  \n  \n  \n  
                    9. override func willExitWithNextState(nextState: GKState) { <\/span><\/li>\n  \n  \n  \n  
                    10.  <\/span><\/li>\n  \n  \n  \n  
                    11.   if nextState is Playing { <\/span><\/li>\n  \n  \n  \n  
                    12.  <\/span><\/li>\n  \n  \n  \n  
                    13.     let scale<\/span> = <\/span>SKAction<\/span>.scaleTo(0, duration: 0.4) <\/span><\/span><\/li>\n  \n  \n  \n  
                    14.  <\/span><\/li>\n  \n  \n  \n  
                    15.     scene.childNodeWithName(GameMessageName)!.runAction(scale) <\/span><\/li>\n  \n  \n  \n  
                    16.  <\/span><\/li>\n  \n  \n  \n  
                    17.   } <\/span><\/li>\n  \n  \n  \n  
                    18.  <\/span><\/li>\n  \n  \n  \n  
                    19. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                      \u5f53\u6e38\u620f\u8fdb\u5165WaitingForTap\u72b6\u6001\u65f6\uff0cdidEnterWithPreviousState(_:) \u65b9\u6cd5\u6267\u884c\u3002\u6b64\u51fd\u6570\u53ea\u662f\u7528\u4e8e\u653e\u5927\u6d88\u606f\u201cTap to Play\u201d\u76f8\u5e94\u7684\u7cbe\u7075\uff0c\u63d0\u793a\u73a9\u5bb6\u5f00\u59cb\u6e38\u620f\u3002 <\/p>\n
                      \u5f53\u6e38\u620f\u9000\u51fa WaitingForTap\u72b6\u6001\u5e76\u8fdb\u5165Playing\u72b6\u6001\u65f6\uff0c\u4f1a\u8c03\u7528 willExitWithNextState(_:)\u65b9\u6cd5\uff0c\u540c\u65f6\u6d88\u606f\u201cTap to Play\u201d\u7f29\u5c0f\u4e3a0\u3002 <\/p>\n
                      \u73b0\u5728\uff0c\u751f\u6210\u548c\u8fd0\u884c\u5de5\u7a0b\uff0c\u7136\u540e\u70b9\u51fb\u5c4f\u5e55\u6765\u73a9\u73a9\u5427\uff01 <\/p>\n
                      \n
                      \u597d\u4e86\uff0c\u73b0\u5728\u5f53\u4f60\u70b9\u51fb\u5c4f\u5e55\u65f6\u6ca1\u4e8b\u53d1\u751f\u3002\u63a5\u4e0b\u6765\u8981\u4ecb\u7ecd\u7684\u6e38\u620f\u72b6\u6001\u6b63\u662f\u7528\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\uff01 <\/p>\n
                      \uff08\u56db\uff09\u73a9\u6e38\u620f\u72b6\u6001 <\/h3>\n
                      Playing\u72b6\u6001\u5c06\u542f\u52a8\u6e38\u620f\u5e76\u7ba1\u7406\u5c0f\u8fd0\u52a8\u7403\u901f\u5ea6\u3002 <\/p>\n
                      \u9996\u5148\uff0c\u5207\u6362\u56de GameScene.swift \u6587\u4ef6\u5e76\u5b9e\u73b0\u4e0b\u9762\u7684\u5e2e\u52a9\u65b9\u6cd5\ufe30 <\/p>\n
                      \n \n \n \n 
                        \n  \n  \n  \n  
                      1. func randomFloat(from from:CGFloat, to:CGFloat) -<\/span>><\/span> CGFloat { <\/span><\/span><\/li>\n  \n  \n  \n  
                      2.  <\/span><\/li>\n  \n  \n  \n  
                      3.   let rand:CGFloat<\/span> = CGFloat(Float(arc4random()) \/ 0xFFFFFFFF) <\/span><\/span><\/li>\n  \n  \n  \n  
                      4.  <\/span><\/li>\n  \n  \n  \n  
                      5.   return (rand) * (to - from) + from <\/span><\/li>\n  \n  \n  \n  
                      6.  <\/span><\/li>\n  \n  \n  \n  
                      7. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                        \u8fd9\u4e2a\u5de5\u5177\u51fd\u6570\u4f1a\u8fd4\u56de\u4f4d\u4e8e\u4e24\u4e2a\u4f20\u5165\u53c2\u6570\u6307\u5b9a\u7684\u6570\u5b57\u4e4b\u95f4\u7684\u968f\u673a\u6570\u3002\u4f60\u5c06\u4f7f\u7528\u5b83\u5728\u5c0f\u7403\u8fd0\u52a8\u7684\u521d\u59cb\u65b9\u5411\u65b9\u9762\u52a0\u5165\u4e00\u4e9b\u53ef\u53d8\u6027\u3002 <\/p>\n
                        \u73b0\u5728\uff0c\u6253\u5f00 Playing.swift \u6587\u4ef6\u3002\u9996\u5148\uff0c\u6dfb\u52a0\u5982\u4e0b\u7684\u5e2e\u52a9\u65b9\u6cd5\uff1a <\/p>\n
                        \n \n \n \n 
                          \n  \n  \n  \n  
                        1. func randomDirection() -<\/span>><\/span> CGFloat { <\/span><\/span><\/li>\n  \n  \n  \n  
                        2.  <\/span><\/li>\n  \n  \n  \n  
                        3.   let speedFactor: CGFloat<\/span> = <\/span>3<\/span>.0 <\/span><\/span><\/li>\n  \n  \n  \n  
                        4.  <\/span><\/li>\n  \n  \n  \n  
                        5.   if scene.randomFloat(from: 0.0, to: 100.0) ><\/span>= 50 { <\/span><\/span><\/li>\n  \n  \n  \n  
                        6.  <\/span><\/li>\n  \n  \n  \n  
                        7.     return -speedFactor <\/span><\/li>\n  \n  \n  \n  
                        8.  <\/span><\/li>\n  \n  \n  \n  
                        9.   } else { <\/span><\/li>\n  \n  \n  \n  
                        10.  <\/span><\/li>\n  \n  \n  \n  
                        11.     return speedFactor <\/span><\/li>\n  \n  \n  \n  
                        12.  <\/span><\/li>\n  \n  \n  \n  
                        13.   } <\/span><\/li>\n  \n  \n  \n  
                        14.  <\/span><\/li>\n  \n  \n  \n  
                        15. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                          \u8fd9\u6bb5\u4ee3\u7801\u53ea\u662f\u5b9e\u73b0\u8fd4\u56de\u4e00\u4e2a\u6b63\u6570\u6216\u8005\u8d1f\u6570\u7684\u529f\u80fd\u3002\u8fd9\u5411\u5c0f\u7403\u7684\u8fd0\u52a8\u65b9\u5411\u65b9\u9762\u6dfb\u52a0\u4e86\u4e00\u70b9\u968f\u673a\u6027\u3002 <\/p>\n
                          \u63a5\u4e0b\u6765\uff0c\u5c06\u6b64\u4ee3\u7801\u6dfb\u52a0\u5230 didEnterWithPreviousState(_:): <\/p>\n
                          \n \n \n \n 
                            \n  \n  \n  \n  
                          1. if previousState is WaitingForTap { <\/span><\/span><\/li>\n  \n  \n  \n  
                          2.  <\/span><\/li>\n  \n  \n  \n  
                          3.   let ball<\/span> = <\/span>scene<\/span>.childNodeWithName(BallCategoryName) as! SKSpriteNode <\/span><\/span><\/li>\n  \n  \n  \n  
                          4.  <\/span><\/li>\n  \n  \n  \n  
                          5.   ball.physicsBody!.applyImpulse(CGVector(dx: randomDirection(), dy: randomDirection())) <\/span><\/li>\n  \n  \n  \n  
                          6.  <\/span><\/li>\n  \n  \n  \n  
                          7. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                            \u5f53\u6e38\u620f\u8fdb\u5165Playing\u72b6\u6001\u65f6\uff0c\u5c0f\u7403\u7cbe\u7075\u88ab\u68c0\u7d22\u5230\uff0c\u5e76\u6fc0\u6d3b\u5176applyImpulse(_:) \u65b9\u6cd5\u3002 <\/p>\n
                            \u63a5\u4e0b\u6765\uff0c\u5c06\u6b64\u4ee3\u7801\u6dfb\u52a0\u5230 updateWithDeltaTime(_:) \u65b9\u6cd5 \ufe30 <\/p>\n
                            \n \n \n \n 
                              \n  \n  \n  \n  
                            1. let <\/span>ball<\/span> = <\/span>scene<\/span>.childNodeWithName(BallCategoryName) as! SKSpriteNode <\/span><\/span><\/li>\n  \n  \n  \n  
                            2.  <\/span><\/li>\n  \n  \n  \n  
                            3. let maxSpeed: CGFloat<\/span> = <\/span>400<\/span>.0 <\/span><\/span><\/li>\n  \n  \n  \n  
                            4.  <\/span><\/li>\n  \n  \n  \n  
                            5. let xSpeed<\/span> = <\/span>sqrt<\/span>(ball.physicsBody!.velocity.dx * ball.physicsBody!.velocity.dx) <\/span><\/span><\/li>\n  \n  \n  \n  
                            6.  <\/span><\/li>\n  \n  \n  \n  
                            7. let ySpeed<\/span> = <\/span>sqrt<\/span>(ball.physicsBody!.velocity.dy * ball.physicsBody!.velocity.dy) <\/span><\/span><\/li>\n  \n  \n  \n  
                            8.  <\/span><\/li>\n  \n  \n  \n  
                            9. let speed<\/span> = <\/span>sqrt<\/span>(ball.physicsBody!.velocity.dx * ball.physicsBody!.velocity.dx + ball.physicsBody!.velocity.dy * ball.physicsBody!.velocity.dy) <\/span><\/span><\/li>\n  \n  \n  \n  
                            10.  <\/span><\/li>\n  \n  \n  \n  
                            11. if xSpeed <<\/span>= 10.0 { <\/span><\/span><\/li>\n  \n  \n  \n  
                            12.  <\/span><\/li>\n  \n  \n  \n  
                            13.   ball.physicsBody!.applyImpulse(CGVector(dx: randomDirection(), dy: 0.0)) <\/span><\/li>\n  \n  \n  \n  
                            14.  <\/span><\/li>\n  \n  \n  \n  
                            15. } <\/span><\/li>\n  \n  \n  \n  
                            16.  <\/span><\/li>\n  \n  \n  \n  
                            17. if ySpeed <<\/span>= 10.0 { <\/span><\/span><\/li>\n  \n  \n  \n  
                            18.  <\/span><\/li>\n  \n  \n  \n  
                            19.   ball.physicsBody!.applyImpulse(CGVector(dx: 0.0, dy: randomDirection())) <\/span><\/li>\n  \n  \n  \n  
                            20.  <\/span><\/li>\n  \n  \n  \n  
                            21. } <\/span><\/li>\n  \n  \n  \n  
                            22.  <\/span><\/li>\n  \n  \n  \n  
                            23. if speed ><\/span> maxSpeed { <\/span><\/span><\/li>\n  \n  \n  \n  
                            24.  <\/span><\/li>\n  \n  \n  \n  
                            25.   ball.physicsBody!.linearDamping<\/span> = <\/span>0<\/span>.4 <\/span><\/span><\/li>\n  \n  \n  \n  
                            26.  <\/span><\/li>\n  \n  \n  \n  
                            27. } else { <\/span><\/li>\n  \n  \n  \n  
                            28.  <\/span><\/li>\n  \n  \n  \n  
                            29.   ball.physicsBody!.linearDamping<\/span> = <\/span>0<\/span>.0 <\/span><\/span><\/li>\n  \n  \n  \n  
                            30.  <\/span><\/li>\n  \n  \n  \n  
                            31. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                              \u5f53\u6e38\u620f\u7684\u6bcf\u5e27\u4e2d\u5904\u4e8ePlaying\u72b6\u6001\u65f6\u5c06\u8c03\u7528updateWithDeltaTime(_:)\u65b9\u6cd5\u3002\u4ee3\u7801\u4e2d\uff0c\u53d6\u5f97\u5c0f\u7403\u6570\u636e\u5e76\u68c0\u67e5\u5176\u901f\u5ea6\uff0c\u672c\u8d28\u4e0a\u5bf9\u5e94\u4e8e\u8fd0\u52a8\u901f\u5ea6\u3002\u5982\u679c\u6cbf x \u6216 y\u65b9\u5411\u7684 \u901f\u5ea6\u4f4e\u4e8e\u67d0\u4e00\u9608\u503c\uff0c\u5c0f\u7403\u53ef\u80fd\u88ab\u5361\u4f4f\u800c\u8868\u73b0\u4e3a\u4e0d\u505c\u5730\u8e66\u8e66\u8df3\u8df3\uff0c\u6216\u4e0d\u505c\u5730\u4ece\u4e00\u8fb9\u8fd0\u52a8\u5230\u53e6\u4e00\u8fb9\u3002\u5982\u679c\u53d1\u751f\u8fd9\u79cd\u60c5\u51b5\uff0c\u9700\u8981\u5e94\u7528\u53e6\u4e00\u79cd\u8109\u51b2\uff0c\u4ece\u800c\u628a\u5b83\u5f3a\u5236\u6027\u8f6c\u5165\u89d2\u8fd0\u52a8\u72b6\u6001\u4e0b\u3002 <\/p>\n
                              \u800c\u4e14\uff0c\u7403\u7684\u901f\u5ea6\u968f\u7740\u8e66\u8df3\u53ef\u80fd\u4e0d\u65ad\u589e\u52a0\u3002\u5982\u679c\u592a\u9ad8\u4e86\uff0c\u4f60\u9700\u8981\u589e\u52a0\u7ebf\u6027\u963b\u5c3c\uff0c\u8fd9\u6837\u5c0f\u7403\u6700\u7ec8\u4f1a\u6162\u4e0b\u6765\u3002 <\/p>\n
                              \u73b0\u5728\uff0c\u73a9\u72b6\u6001\u8bbe\u7f6e\u4e86\uff0c\u662f\u65f6\u5019\u6dfb\u52a0\u4ee3\u7801\u6765\u542f\u52a8\u6e38\u620f\u4e86\uff01 <\/p>\n
                              \u5728\u6587\u4ef6GameScene.swift\u4e2d\uff0c\u5c06 touchesBegan(_:withEvent:)\u65b9\u6cd5 \u66ff\u6362\u6210\u4e0b\u9762\u7684\u65b0\u4ee3\u7801\uff1a <\/p>\n
                              \n \n \n \n 
                                \n  \n  \n  \n  
                              1. override func touchesBegan(touches: Set<\/span><<\/span>UITouch<\/span>><\/span>, withEvent event: UIEvent?) { <\/span><\/span><\/li>\n  \n  \n  \n  
                              2.  <\/span><\/li>\n  \n  \n  \n  
                              3.   switch gameState.currentState { <\/span><\/li>\n  \n  \n  \n  
                              4.  <\/span><\/li>\n  \n  \n  \n  
                              5.   case is WaitingForTap: <\/span><\/li>\n  \n  \n  \n  
                              6.  <\/span><\/li>\n  \n  \n  \n  
                              7.     gameState.enterState(Playing) <\/span><\/li>\n  \n  \n  \n  
                              8.  <\/span><\/li>\n  \n  \n  \n  
                              9.     isFingerOnPaddle<\/span> = <\/span>true<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                              10.  <\/span><\/li>\n  \n  \n  \n  
                              11.   case is Playing: <\/span><\/li>\n  \n  \n  \n  
                              12.  <\/span><\/li>\n  \n  \n  \n  
                              13.     let touch<\/span> = <\/span>touches<\/span>.first <\/span><\/span><\/li>\n  \n  \n  \n  
                              14.  <\/span><\/li>\n  \n  \n  \n  
                              15.     let touch<\/span>touchLocation<\/span> = touch!.locationInNode(self) <\/span><\/span><\/li>\n  \n  \n  \n  
                              16.  <\/span><\/li>\n  \n  \n  \n  
                              17.     if let body<\/span> = <\/span>physicsWorld<\/span>.bodyAtPoint(touchLocation) { <\/span><\/span><\/li>\n  \n  \n  \n  
                              18.  <\/span><\/li>\n  \n  \n  \n  
                              19.       if body.node!.name<\/span> == PaddleCategoryName { <\/span><\/span><\/li>\n  \n  \n  \n  
                              20.  <\/span><\/li>\n  \n  \n  \n  
                              21.         isFingerOnPaddle<\/span> = <\/span>true<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                              22.  <\/span><\/li>\n  \n  \n  \n  
                              23.       } <\/span><\/li>\n  \n  \n  \n  
                              24.     } <\/span><\/li>\n  \n  \n  \n  
                              25.  <\/span><\/li>\n  \n  \n  \n  
                              26.   default: <\/span><\/li>\n  \n  \n  \n  
                              27.  <\/span><\/li>\n  \n  \n  \n  
                              28.     break <\/span><\/li>\n  \n  \n  \n  
                              29.  <\/span><\/li>\n  \n  \n  \n  
                              30.   } <\/span><\/li>\n  \n  \n  \n  
                              31.  <\/span><\/li>\n  \n  \n  \n  
                              32. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                \u4e0a\u9762\u4ee3\u7801\u53ef\u4ee5\u4f7f\u6e38\u620f\u68c0\u67e5\u6e38\u620f\u7684\u5f53\u524d\u72b6\u6001\uff0c\u5e76\u76f8\u5e94\u5730\u66f4\u6539\u72b6\u6001\u3002\u63a5\u4e0b\u6765\uff0c\u4f60\u9700\u8981\u91cd\u5199 update(_:) \u65b9\u6cd5\u5e76\u4fee\u6539\u6210\u50cf\u8fd9\u6837\uff1a <\/p>\n
                                \n \n \n \n 
                                  \n  \n  \n  \n  
                                1. override func update(currentTime: NSTimeInterval) { <\/span><\/span><\/li>\n  \n  \n  \n  
                                2.  <\/span><\/li>\n  \n  \n  \n  
                                3.   gameState.updateWithDeltaTime(currentTime) <\/span><\/li>\n  \n  \n  \n  
                                4.  <\/span><\/li>\n  \n  \n  \n  
                                5. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                  \u5728\u6e32\u67d3\u6bcf\u4e00\u5e27\u4e4b\u524d\u90fd\u4f1a\u8c03\u7528 update(_:) \u65b9\u6cd5\u3002\u6b63\u662f\u5728\u6b64\u5904\uff0c\u6211\u4eec\u8c03\u7528\u73a9\u72b6\u6001\u5bf9\u5e94\u7684updateWithDeltaTime(_:) \u65b9\u6cd5\u6765\u7ba1\u7406\u5c0f\u7403\u7684\u8fd0\u52a8\u901f\u5ea6\u3002 <\/p>\n
                                  \u73b0\u5728\uff0c\u751f\u6210\u5e76\u8fd0\u884c\u9879\u76ee\uff0c\u7136\u540e\u70b9\u51fb\u5c4f\u5e55\u6765\u67e5\u770b\u72b6\u6001\u673a\u5728\u6e38\u620f\u4e2d\u7684\u4f5c\u7528\uff01 <\/p>\n
                                  \n
                                  \uff08\u4e94\uff09\u6e38\u620f\u7ed3\u675f\u72b6\u6001 <\/h3>\n
                                  \u5f53\u6240\u6709\u7684\u7af9\u5757\u88ab\u538b\u8de8\u6216\u5c0f\u7403\u8dcc\u843d\u5230\u5c4f\u5e55\u7684\u5e95\u90e8\u65f6GameOver\u72b6\u6001\u53d1\u751f\u3002 <\/p>\n
                                  \u73b0\u5728\uff0c\u6211\u4eec\u6253\u5f00\u4f4d\u4e8eGame States\u7ec4\u4e2d\u7684GameOver.swift\u6587\u4ef6\uff0c\u5e76\u5c06\u4e0b\u9762\u8fd9\u4e9b\u4ee3\u7801\u884c\u6dfb\u52a0\u5230\u65b9\u6cd5didEnterWithPreviousState(_:)\u4e2d\uff1a <\/p>\n
                                  \n \n \n \n 
                                    \n  \n  \n  \n  
                                  1. if previousState is Playing { <\/span><\/span><\/li>\n  \n  \n  \n  
                                  2.  <\/span><\/li>\n  \n  \n  \n  
                                  3.   let ball<\/span> = <\/span>scene<\/span>.childNodeWithName(BallCategoryName) as! SKSpriteNode <\/span><\/span><\/li>\n  \n  \n  \n  
                                  4.  <\/span><\/li>\n  \n  \n  \n  
                                  5.   ball.physicsBody!.linearDamping<\/span> = <\/span>1<\/span>.0 <\/span><\/span><\/li>\n  \n  \n  \n  
                                  6.  <\/span><\/li>\n  \n  \n  \n  
                                  7.   scene.physicsWorld.gravity<\/span> = <\/span>CGVectorMake<\/span>(0, -9.8) <\/span><\/span><\/li>\n  \n  \n  \n  
                                  8.  <\/span><\/li>\n  \n  \n  \n  
                                  9. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                    \u5f53\u6e38\u620f\u8fdb\u5165GameOver\u72b6\u6001\u65f6\uff0c\u7ebf\u6027\u963b\u5c3c\u5e94\u7528\u4e8e\u5c0f\u7403\u800c\u4e14\u91cd\u529b\u5f97\u5230\u6062\u590d\uff0c\u4ece\u800c\u5bfc\u81f4\u5c0f\u8dcc\u843d\u5230\u5730\u4e0a\uff0c\u901f\u5ea6\u4e5f\u6162\u4e0b\u6765\u3002 <\/p>\n
                                    \u5173\u4e8eGameOver\u72b6\u6001\uff0c\u6211\u4eec\u5c31\u8ba8\u8bba\u81f3\u6b64\u3002\u63a5\u4e0b\u6765\u8981\u5b9e\u73b0\u7684\u4ee3\u7801\u662f\u786e\u5b9a\u73a9\u5bb6\u662f\u8d62\u4e86\u8fd8\u662f\u8f93\u6389\u4e86\u6e38\u620f\uff01 <\/p>\n
                                    \uff08\u516d\uff09\u6e38\u620f\u7ed3\u5c40 <\/h3>\n
                                    \u5230\u73b0\u5728\uff0c\u65e2\u7136\u72b6\u6001\u673a\u90fd\u8bbe\u7f6e\u597d\u4e86\uff0c\u53ef\u4ee5\u8bf4\u6e38\u620f\u7684\u7edd\u5927\u90e8\u5206\u5df2\u7ecf\u5f00\u53d1\u7ed3\u675f\u3002\u73b0\u5728\uff0c\u6211\u4eec\u9700\u8981\u60f3\u4e00\u79cd\u529e\u6cd5\u6765\u786e\u5b9a\u6e38\u620f\u7684\u8f93\u8d62\u3002 <\/p>\n
                                    \u6253\u5f00\u6587\u4ef6GameScene.swift\u5e76\u6dfb\u52a0\u4e0b\u9762\u7684\u5e2e\u52a9\u65b9\u6cd5\uff1a <\/p>\n
                                    \n \n \n \n 
                                      \n  \n  \n  \n  
                                    1. func isGameWon() -<\/span>><\/span> Bool { <\/span><\/span><\/li>\n  \n  \n  \n  
                                    2.  <\/span><\/li>\n  \n  \n  \n  
                                    3.   var numberOfBricks<\/span> = <\/span>0<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                                    4.  <\/span><\/li>\n  \n  \n  \n  
                                    5.   self.enumerateChildNodesWithName(BlockCategoryName) { <\/span><\/li>\n  \n  \n  \n  
                                    6.  <\/span><\/li>\n  \n  \n  \n  
                                    7.     node, stop in <\/span><\/li>\n  \n  \n  \n  
                                    8.  <\/span><\/li>\n  \n  \n  \n  
                                    9.     numberOfBricks<\/span>numberOfBricks<\/span> = numberOfBricks + 1 <\/span><\/span><\/li>\n  \n  \n  \n  
                                    10.  <\/span><\/li>\n  \n  \n  \n  
                                    11.   } <\/span><\/li>\n  \n  \n  \n  
                                    12.  <\/span><\/li>\n  \n  \n  \n  
                                    13.   return numberOfBricks<\/span> == 0 <\/span><\/span><\/li>\n  \n  \n  \n  
                                    14.  <\/span><\/li>\n  \n  \n  \n  
                                    15. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                      \u6b64\u65b9\u6cd5\u901a\u8fc7\u904d\u5386\u573a\u666f\u4e2d\u5b50\u7ed3\u70b9\u6765\u68c0\u67e5\u573a\u666f\u4e2d\u8fd8\u7559\u4e0b\u591a\u5c11\u7af9\u5757\u3002\u5bf9\u4e8e\u6bcf\u4e00\u4e2a\u5b50\u7ed3\u70b9\uff0c\u5b83\u8981\u68c0\u67e5\u5b50\u7ed3\u70b9\u540d\u5b57\u662f\u5426\u7b49\u4e8e BlockCategoryName\u3002\u5982\u679c\u573a\u666f\u4e2d\u6ca1\u6709\u7559\u4e0b\u7af9\u5757\uff0c\u90a3\u4e48\u73a9\u5bb6\u8d62\u5f97\u4e86\u5f53\u524d\u6e38\u620f\uff0c\u65b9\u6cd5\u8fd4\u56de true\u3002 <\/p>\n
                                      \u73b0\u5728\uff0c\u5c06\u5982\u4e0b\u5c5e\u6027\u6dfb\u52a0\u5230\u7c7b\u7684\u9876\u90e8\uff0c\u4e5f\u5c31\u662f\u6070\u597d\u4f4d\u4e8e\u5c5e\u6027gameState\u7684\u4e0b\u9762\uff1a <\/p>\n
                                      \n \n \n \n 
                                        \n  \n  \n  \n  
                                      1. var gameWon : <\/span>Bool<\/span> = <\/span>false<\/span> { <\/span><\/span><\/li>\n  \n  \n  \n  
                                      2.  <\/span><\/li>\n  \n  \n  \n  
                                      3.   didSet { <\/span><\/li>\n  \n  \n  \n  
                                      4.  <\/span><\/li>\n  \n  \n  \n  
                                      5.     let gameOver<\/span> = <\/span>childNodeWithName<\/span>(GameMessageName) as! SKSpriteNode <\/span><\/span><\/li>\n  \n  \n  \n  
                                      6.  <\/span><\/li>\n  \n  \n  \n  
                                      7.     let textureName<\/span> = <\/span>gameWon<\/span> ? \"YouWon\" : \"GameOver\" <\/span><\/span><\/li>\n  \n  \n  \n  
                                      8.  <\/span><\/li>\n  \n  \n  \n  
                                      9.     let texture<\/span> = <\/span>SKTexture<\/span>(imageNamed: textureName) <\/span><\/span><\/li>\n  \n  \n  \n  
                                      10.  <\/span><\/li>\n  \n  \n  \n  
                                      11.     let actionSequence<\/span> = <\/span>SKAction<\/span>.sequence([SKAction.setTexture(texture), <\/span><\/span><\/li>\n  \n  \n  \n  
                                      12.  <\/span><\/li>\n  \n  \n  \n  
                                      13.       SKAction.scaleTo(1.0, duration: 0.25)]) <\/span><\/li>\n  \n  \n  \n  
                                      14.  <\/span><\/li>\n  \n  \n  \n  
                                      15.     gameOver.runAction(actionSequence) <\/span><\/li>\n  \n  \n  \n  
                                      16.  <\/span><\/li>\n  \n  \n  \n  
                                      17.   } <\/span><\/li>\n  \n  \n  \n  
                                      18.  <\/span><\/li>\n  \n  \n  \n  
                                      19. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                        \u5728\u8fd9\u91cc\uff0c\u4f60\u521b\u5efa\u4e86gameWon\u53d8\u91cf\uff0c\u5e76\u4e3a\u4e4b\u9644\u52a0\u4e00\u4e2adidSet\u5c5e\u6027\u89c2\u5bdf\u5668\u3002\u8fd9\u5c06\u5141\u8bb8\u4f60\u89c2\u5bdf\u5c5e\u6027\u503c\u7684\u53d8\u5316\u60c5\u51b5\u5e76\u505a\u51fa\u76f8\u5e94\u7684\u53cd\u5e94\u3002\u5728\u4e0a\u9762\u5b9e\u73b0\u4ee3\u7801\u4e2d\uff0c\u6539\u53d8\u6e38\u620f\u6d88\u606f\u7cbe\u7075\u7684\u7eb9\u7406\u4ee5\u53cd\u6620\u6e38\u620f\u662f\u8d62\u4e86\u8fd8\u662f\u8f93\u4e86\uff0c\u7136\u540e\u5728\u5c4f\u5e55\u4e0a\u663e\u793a\u7ed3\u679c\u3002 <\/p>\n
                                        \uff3b\u6ce8\u610f\uff3d\u5c5e\u6027\u89c2\u5bdf\u5668\uff08Property Observer\uff09\u6709\u4e00\u4e2a\u5141\u8bb8\u60a8\u68c0\u67e5\u65b0\u503c\u6216\u65e7\u503c\u7684\u53c2\u6570\u3002\u5f53\u53d1\u751f\u5c5e\u6027\u53d8\u5316\u65f6\u5141\u8bb8\u503c\u53d8\u5316\u7684\u6bd4\u8f83\u3002\u5982\u679c\u4f60\u4e0d\u63d0\u4f9b\u540d\u79f0\u7684\u8bdd\uff0c\u5b83\u4eec\u81ea\u5df1\u90fd\u6709\u9ed8\u8ba4\u540d\u79f0\uff1b\u5728\u4e0a\u8ff0\u4ee3\u7801\u4e2d\u5206\u522b\u662fnewValue\u548coldValue\u3002 <\/p>\n
                                        \u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u7f16\u8f91\u4e00\u4e0bdidBeginContact(_:) \u65b9\u6cd5\uff0c\u5982\u4e0b\u6240\u793a\uff1a <\/p>\n
                                        \u9996\u5148\uff0c\u628a\u4e0b\u9762\u4ee3\u7801\u6dfb\u52a0\u5230didBeginContact(_:)\u65b9\u6cd5\u7684\u6700\u9876\u7aef\uff1a <\/p>\n
                                        \n \n \n \n 
                                          \n  \n  \n  \n  
                                        1. if gameState.currentState is Playing { <\/span><\/span><\/li>\n  \n  \n  \n  
                                        2.  <\/span><\/li>\n  \n  \n  \n  
                                        3. \/\/ Previous code remains here... <\/span><\/li>\n  \n  \n  \n  
                                        4.  <\/span><\/li>\n  \n  \n  \n  
                                        5. } \/\/ Don't forget to close the 'if' statement at the end of the method. <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                          \u8fd9\u6bb5\u4ee3\u7801\u7684\u529f\u80fd\u662f\uff1a\u5f53\u6e38\u620f\u8fd8\u672a\u5904\u4e8e\u73a9\u72b6\u6001\u65f6\uff0c\u9632\u6b62\u4efb\u4f55\u7684\u63a5\u89e6\u53d1\u751f\u3002 <\/p>\n
                                          \u63a5\u4e0b\u6765\uff0c\u4f7f\u7528\u4e0b\u9762\u8fd9\u6bb5\u4ee3\u7801\uff1a <\/p>\n
                                          \n \n \n \n 
                                            \n  \n  \n  \n  
                                          1. print(\"Hit bottom. First contact has been made.\") <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                            \u66ff\u6362\u6389\u4e0b\u9762\u7684\u4ee3\u7801\uff1a <\/p>\n
                                            \n \n \n \n 
                                              \n  \n  \n  \n  
                                            1. gameState.enterState(GameOver) <\/span><\/span><\/li>\n  \n  \n  \n  
                                            2.  <\/span><\/li>\n  \n  \n  \n  
                                            3. gameWon<\/span> = <\/span>false<\/span> <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                              \u73b0\u5728\uff0c\u5f53\u5c0f\u7403\u78b0\u5230\u5c4f\u5e55\u7684\u5e95\u90e8\u65f6\u6e38\u620f\u7ed3\u675f\u3002 <\/p>\n
                                              \u8bf7\u4f7f\u7528\u5982\u4e0b\u4ee3\u7801\u66ff\u6362\u6389\/\/TODO:\u90e8\u5206\uff1a <\/p>\n
                                              \n \n \n \n 
                                                \n  \n  \n  \n  
                                              1. if isGameWon() { <\/span><\/span><\/li>\n  \n  \n  \n  
                                              2.  <\/span><\/li>\n  \n  \n  \n  
                                              3.   gameState.enterState(GameOver) <\/span><\/li>\n  \n  \n  \n  
                                              4.  <\/span><\/li>\n  \n  \n  \n  
                                              5.   gameWon<\/span> = <\/span>true<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                                              6.  <\/span><\/li>\n  \n  \n  \n  
                                              7. } <\/span><\/li>\n  \n  \n  \n  
                                              8.  <\/span><\/li>\n  \n  \n  \n  
                                              9. When all the blocks are broken you win! <\/span><\/li>\n  \n  \n  \n  
                                              10.  <\/span><\/li>\n  \n  \n  \n  
                                              11. Finally, add this code to touchesBegan(_:withEvent:) just above default: <\/span><\/li>\n  \n  \n  \n  
                                              12.  <\/span><\/li>\n  \n  \n  \n  
                                              13. case is GameOver: <\/span><\/li>\n  \n  \n  \n  
                                              14.  <\/span><\/li>\n  \n  \n  \n  
                                              15.   let newScene<\/span> = <\/span>GameScene<\/span>(fileNamed:\"GameScene\") <\/span><\/span><\/li>\n  \n  \n  \n  
                                              16.  <\/span><\/li>\n  \n  \n  \n  
                                              17.   newScene!.scaleMode<\/span> = .AspectFit <\/span><\/span><\/li>\n  \n  \n  \n  
                                              18.  <\/span><\/li>\n  \n  \n  \n  
                                              19.   let reveal<\/span> = <\/span>SKTransition<\/span>.flipHorizontalWithDuration(0.5) <\/span><\/span><\/li>\n  \n  \n  \n  
                                              20.  <\/span><\/li>\n  \n  \n  \n  
                                              21.   self.view?.presentScene(newScene!, transition: reveal) <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                \u81f3\u6b64\uff0c\u4f60\u7684\u6e38\u620f\u5df2\u7ecf\u5b8c\u6210\uff01\u4f60\u53ef\u4ee5\u6784\u5efa\u5e76\u8fd0\u884c\u5b83\u4e86\u3002 <\/p>\n
                                                \n
                                                 \u4e94\u3001  \u6e38\u620f\u6da6\u8272 <\/h2>\n
                                                \u73b0\u5728\uff0c\u6253\u7af9\u5757\u6e38\u620f\u4e3b\u8981\u529f\u80fd\u5f00\u53d1\u5b8c\u6bd5\u3002\u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u5728\u6e38\u620f\u4e2d\u6dfb\u52a0\u4e9b\u8bb8\u7684\u6da6\u8272\uff01\u6bcf\u5f53\u5c0f\u7403\u53d1\u751f\u63a5\u89e6\u548c\u5f53\u7af9\u5757\u7834\u88c2\u65f6\u52a0\u5165\u4e00\u4e9b\u97f3\u6548\u3002\u5f53\u6e38\u620f\u7ed3\u675f\u7684\u65f6\u5019\uff0c\u4e5f\u6dfb\u52a0\u4e00\u79cd\u5feb\u901f\u7206\u70b8\u7684\u97f3\u4e50\u6548\u679c\u3002***\uff0c\u60a8\u5c06\u628a\u4e00\u4e2a\u7c92\u5b50\u53d1\u5c04\u5668\u6dfb\u52a0\u5230\u5c0f\u7403\uff0c\u4ee5\u4fbf\u5f53\u5c0f\u7403\u5728\u5c4f\u5e55\u5468\u56f4\u6765\u56de\u53cd\u5f39\u65f6\u7559\u4e0b\u4e00\u9053\u75d5\u8ff9\u3002 <\/p>\n
                                                \uff08\u4e00\uff09\u52a0\u5165\u58f0\u6548 <\/h3>\n
                                                \u4e3a\u4e86\u8282\u7701\u65f6\u95f4\uff0c\u9879\u76ee\u4e2d\u5df2\u7ecf\u5bfc\u5165\u4e86\u5404\u79cd\u58f0\u97f3\u6587\u4ef6\u3002\u73b0\u5728\uff0c\u6253\u5f00GameScene.swift\u6587\u4ef6\uff0c\u7136\u540e\u628a\u4e0b\u5217\u5e38\u91cf\u5b9a\u4e49\u6dfb\u52a0\u5230\u7c7b\u5b9a\u4e49\u7684\u9876\u90e8\uff0c\u66f4\u786e\u5207\u5730\u8bf4\u662f\u6070\u597d\u4f4d\u4e8egameWon\u53d8\u91cf\u7684\u540e\u9762\uff1a <\/p>\n
                                                \n \n \n \n 
                                                  \n  \n  \n  \n  
                                                1. let <\/span>blipSound<\/span> = <\/span>SKAction<\/span>.playSoundFileNamed(\"pongblip\", waitForCompletion: false) <\/span><\/span><\/li>\n  \n  \n  \n  
                                                2.  <\/span><\/li>\n  \n  \n  \n  
                                                3. let blipPaddleSound<\/span> = <\/span>SKAction<\/span>.playSoundFileNamed(\"paddleBlip\", waitForCompletion: false) <\/span><\/span><\/li>\n  \n  \n  \n  
                                                4.  <\/span><\/li>\n  \n  \n  \n  
                                                5. let bambooBreakSound<\/span> = <\/span>SKAction<\/span>.playSoundFileNamed(\"BambooBreak\", waitForCompletion: false) <\/span><\/span><\/li>\n  \n  \n  \n  
                                                6.  <\/span><\/li>\n  \n  \n  \n  
                                                7. let gameWonSound<\/span> = <\/span>SKAction<\/span>.playSoundFileNamed(\"game-won\", waitForCompletion: false) <\/span><\/span><\/li>\n  \n  \n  \n  
                                                8.  <\/span><\/li>\n  \n  \n  \n  
                                                9. let gameOverSound<\/span> = <\/span>SKAction<\/span>.playSoundFileNamed(\"game-over\", waitForCompletion: false) <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                  \u8fd9\u6bb5\u4ee3\u7801\u4e2d\u5b9a\u4e49\u4e86\u4e00\u7cfb\u5217\u7684SKAction\u5e38\u91cf\uff0c\u5176\u4e2d\u6bcf\u4e00\u4e2a\u90fd\u5c06\u52a0\u8f7d\u5e76\u64ad\u653e\u58f0\u97f3\u6587\u4ef6\u3002\u56e0\u4e3a\u4f60\u5728\u9700\u8981\u5b83\u4eec\u4e4b\u524d\u5b9a\u4e49\u4e86\u8fd9\u4e9b\u64cd\u4f5c\uff0c\u6240\u4ee5\u5b83\u4eec\u4f1a\u88ab\u9884\u5148\u52a0\u8f7d\u5230\u5185\u5b58\uff0c\u8fd9\u5728\u4f60***\u6b21\u64ad\u653e\u58f0\u97f3\u65f6\u9632\u6b62\u6e38\u620f\u5ef6\u8fdf\u3002 <\/p>\n
                                                  \u4e0b\u4e00\u6b65\uff0c\u5c06\u5728didMoveToView(_:)\u65b9\u6cd5\u4e2d\u8bbe\u7f6e\u5c0f\u7403\u7684contactTestBitMask\u63a9\u7801\u7684\u90a3\u4e00\u884c\u66f4\u65b0\u4e3a\u4ee5\u4e0b\u5f62\u5f0f\ufe30 <\/p>\n
                                                  \n \n \n \n 
                                                    \n  \n  \n  \n  
                                                  1. ball.physicsBody!<\/span>.contactTestBitMask<\/span> = <\/span>BottomCategory<\/span> | BlockCategory | BorderCategory | PaddleCategory <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                    \u5e76\u6ca1\u6709\u4ec0\u4e48\u65b0\u5185\u5bb9\uff0c\u53ea\u662f\u5728\u5c0f\u7403\u7684contactTestBitMask\u63a9\u7801\u4e0a\u6dfb\u52a0\u4e86BorderCategory\u548cPaddleCategory\uff0c\u8fd9\u6837\u4f60\u5c31\u53ef\u4ee5\u68c0\u6d4b\u5230\u4e0e\u5c4f\u5e55\u8fb9\u754c\u7684\u63a5\u89e6\uff0c\u4ee5\u53ca\u5f53\u5c0f\u7403\u4e0e\u6321\u677f\u63a5\u89e6\u65f6\u4f7f\u7528\u3002 <\/p>\n
                                                    \u63a5\u4e0b\u6765\uff0c\u8ba9\u6211\u4eec\u4fee\u6539\u4e00\u4e0b\u65b9\u6cd5didBeginContact(_:)\u6765\u52a0\u5165\u58f0\u97f3\u6548\u679c\uff0c\u65b9\u6cd5\u662f\u628a\u4ee5\u4e0b\u51e0\u884c\u6dfb\u52a0\u5230\u8bbe\u7f6efirstBody\u548csecondBody\u7684if\/else\u8bed\u53e5\u540e\u9762\uff1a <\/p>\n
                                                    \n \n \n \n 
                                                      \n  \n  \n  \n  
                                                    1. \/\/ 1 <\/span><\/span><\/li>\n  \n  \n  \n  
                                                    2.  <\/span><\/li>\n  \n  \n  \n  
                                                    3. if firstBody.categoryBitMask<\/span> == BallCategory && <\/span>secondBody.categoryBitMask<\/span> == BorderCategory { <\/span><\/span><\/li>\n  \n  \n  \n  
                                                    4.  <\/span><\/li>\n  \n  \n  \n  
                                                    5.   runAction(blipSound) <\/span><\/li>\n  \n  \n  \n  
                                                    6.  <\/span><\/li>\n  \n  \n  \n  
                                                    7. } <\/span><\/li>\n  \n  \n  \n  
                                                    8.  <\/span><\/li>\n  \n  \n  \n  
                                                    9. \/\/ 2 <\/span><\/li>\n  \n  \n  \n  
                                                    10.  <\/span><\/li>\n  \n  \n  \n  
                                                    11. if firstBody.categoryBitMask<\/span> == BallCategory && <\/span>secondBody.categoryBitMask<\/span> == PaddleCategory { <\/span><\/span><\/li>\n  \n  \n  \n  
                                                    12.  <\/span><\/li>\n  \n  \n  \n  
                                                    13.   runAction(blipPaddleSound) <\/span><\/li>\n  \n  \n  \n  
                                                    14.  <\/span><\/li>\n  \n  \n  \n  
                                                    15. } <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                      \u6b64\u4ee3\u7801\u8d1f\u8d23\u68c0\u67e5\u4e24\u4e2a\u65b0\u7684\u78b0\u649e\uff1a <\/p>\n
                                                      \uff081\uff09\u5728\u4ece\u5c4f\u5e55\u8fb9\u754c\u53cd\u5f39\u65f6\u64ad\u653eblipSound\u58f0\u6548\u3002 <\/p>\n
                                                      \uff082\uff09\u5728\u5c0f\u7403\u4e0e\u6321\u677f\u63a5\u89e6\u65f6\u64ad\u653eblipPaddleSound\u58f0\u6548\u3002 <\/p>\n
                                                      \u5f53\u7136\uff0c\u4f60\u5e0c\u671b\u5728\u5c0f\u7403\u6253\u7834\u7af9\u5757\u65f6\u4f7f\u7528\u4ee4\u4eba\u6ee1\u610f\u7684\u560e\u5431\u58f0\u6548\u3002\u4e3a\u6b64\uff0c\u4f60\u53ef\u4ee5\u5c06\u4e0b\u9762\u4e00\u884c\u6dfb\u52a0\u5230\u65b9\u6cd5breakBlock(_:) \u7684\u9876\u90e8\uff1a <\/p>\n
                                                      \n \n \n \n 
                                                        \n  \n  \n  \n  
                                                      1. runAction(bambooBreakSound) <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                        ***\uff0c\u5728\u7c7b\u9876\u90e8\u7684\u9488\u5bf9\u53d8\u91cfgameWon\u521b\u5efa\u7684didSet\u5c5e\u6027\u89c2\u5bdf\u5668\u7684\u91cc\u9762\u63d2\u5165\u4e0b\u9762\u7684\u884c\u7801\u884c\u5373\u53ef\uff1a <\/p>\n
                                                        \n \n \n \n 
                                                          \n  \n  \n  \n  
                                                        1. runAction(gameWon ? gameWonSound : gameOverSound) <\/span><\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                          \uff08\u4e8c\uff09\u52a0\u5165\u7c92\u5b50\u7cfb\u7edf <\/h3>\n
                                                          \u73b0\u5728\uff0c\u8ba9\u6211\u4eec\u7ed9\u5c0f\u7403\u6dfb\u52a0\u4e00\u4e2a\u7c92\u5b50\u7cfb\u7edf\uff1b\u8fd9\u6837\u4e00\u6765\uff0c\u5f53\u5b83\u56db\u5904\u53cd\u5f39\u65f6\u4f1a\u7559\u4e0b\u4e00\u6761\u706b\u82d7\u6837\u5f0f\u7684\u8f68\u8ff9\uff01 <\/p>\n
                                                          \u4e3a\u6b64\uff0c\u53ef\u4ee5\u5c06\u4e0b\u9762\u7684\u4ee3\u7801\u6dfb\u52a0\u5230\u65b9\u6cd5didMoveToView(_:)\u4e2d\uff1a <\/p>\n
                                                          \n \n \n \n 
                                                            \n  \n  \n  \n  
                                                          1. \/\/ 1 <\/span><\/span><\/li>\n  \n  \n  \n  
                                                          2.  <\/span><\/li>\n  \n  \n  \n  
                                                          3. let trailNode<\/span> = <\/span>SKNode<\/span>() <\/span><\/span><\/li>\n  \n  \n  \n  
                                                          4.  <\/span><\/li>\n  \n  \n  \n  
                                                          5. trailNode.zPosition<\/span> = <\/span>1<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                                                          6.  <\/span><\/li>\n  \n  \n  \n  
                                                          7. addChild(trailNode) <\/span><\/li>\n  \n  \n  \n  
                                                          8.  <\/span><\/li>\n  \n  \n  \n  
                                                          9. \/\/ 2 <\/span><\/li>\n  \n  \n  \n  
                                                          10.  <\/span><\/li>\n  \n  \n  \n  
                                                          11. let trail<\/span> = <\/span>SKEmitterNode<\/span>(fileNamed: \"BallTrail\")! <\/span><\/span><\/li>\n  \n  \n  \n  
                                                          12.  <\/span><\/li>\n  \n  \n  \n  
                                                          13. \/\/ 3 <\/span><\/li>\n  \n  \n  \n  
                                                          14.  <\/span><\/li>\n  \n  \n  \n  
                                                          15. trail.targetNode<\/span> = <\/span>trailNode<\/span> <\/span><\/span><\/li>\n  \n  \n  \n  
                                                          16.  <\/span><\/li>\n  \n  \n  \n  
                                                          17. \/\/ 4 <\/span><\/li>\n  \n  \n  \n  
                                                          18.  <\/span><\/li>\n  \n  \n  \n  
                                                          19. ball.addChild(trail) <\/span><\/li>\n \n \n \n <\/ol><\/pre>\n
                                                            \u8ba9\u6211\u4eec\u56de\u987e\u4e00\u4e0b\u4e0a\u9762\u4ee3\u7801\u7684\u529f\u80fd\uff1a <\/p>\n
                                                            \uff081\uff09\u521b\u5efa\u4e00\u4e2aSKNode\u4f5c\u4e3a\u7c92\u5b50\u7cfb\u7edf\u7684targetNode\u3002 <\/p>\n
                                                            \uff082\uff09\u4eceBallTrail.sks\u6587\u4ef6\u521b\u5efa\u4e00\u4e2aSKEmitterNode\u3002 <\/p>\n
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