{"id":190880,"date":"2022-07-06T02:12:25","date_gmt":"2022-07-05T18:12:25","guid":{"rendered":"https:\/\/www.idc.net\/help\/190880\/"},"modified":"2022-07-06T02:12:25","modified_gmt":"2022-07-05T18:12:25","slug":"%e5%90%8e%e6%b5%aa%e4%ba%91ios%e6%95%99%e7%a8%8b%ef%bc%9a%e5%a3%b0%e6%98%8e%e8%87%aa%e5%ae%9a%e8%a7%86%e5%9b%be","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/190880\/","title":{"rendered":"\u540e\u6d6a\u4e91IOS\u6559\u7a0b\uff1a\u58f0\u660e\u81ea\u5b9a\u89c6\u56fe"},"content":{"rendered":"<h2> \u6982\u89c8 <\/h2>\n<p> SwiftUI \u4e3a\u7528\u6237\u754c\u9762\u8bbe\u8ba1\u63d0\u4f9b\u4e00\u79cd\u58f0\u660e\u7684\u65b9\u6cd5\u3002\u5728\u4f7f\u7528\u4f20\u7edf\u7684\u547d\u4ee4\u5f0f\u65b9\u6cd5\u65f6\uff0c\u4f60\u7684\u63a7\u5236\u5668\u4ee3\u7801\u4e0d\u4ec5\u8981\u62c5\u8d1f\u89c6\u56fe\u5b9e\u4f8b\u5316\u3001\u5e03\u5c40\u548c\u914d\u7f6e\u7684\u4efb\u52a1\uff0c\u8fd8\u8981\u968f\u7740\u6761\u4ef6\u53d1\u751f\u53d8\u5316\u6301\u7eed\u8fdb\u884c\u66f4\u65b0\u3002\u76f8\u6bd4\u4e4b\u4e0b\uff0c\u501f\u52a9\u58f0\u660e\u5f0f\u65b9\u6cd5\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u58f0\u660e\u89c6\u56fe\u6765\u521b\u5efa\u7528\u6237\u754c\u9762\u7684\u8f7b\u91cf\u7ea7\u63cf\u8ff0\uff0c\u89c6\u56fe\u7684\u5c42\u7ea7\u7ed3\u6784\u53cd\u6620\u4e86\u6240\u9700\u7684\u754c\u9762\u5e03\u5c40\u3002\u7136\u540e\uff0cSwiftUI \u4f1a\u7ba1\u7406\u8fd9\u4e9b\u89c6\u56fe\u7684\u7ed8\u5236\u548c\u66f4\u65b0\u4ee5\u54cd\u5e94\u7528\u6237\u8f93\u5165\u548c\u72b6\u6001\u66f4\u6539\u7b49\u4e8b\u4ef6\u3002 <\/p>\n<\/p>\n<p> SwiftUI \u63d0\u4f9b\u7528\u4e8e\u5728\u7528\u6237\u754c\u9762\u4e2d\u5b9a\u4e49\u548c\u914d\u7f6e\u89c6\u56fe\u7684\u5de5\u5177\u3002\u901a\u8fc7 SwiftUI \u63d0\u4f9b\u7684\u539f\u751f\u89c6\u56fe\u4ee5\u53ca\u4f60\u5df2\u5b9a\u4e49\u7684\u5176\u4ed6\u590d\u5408\u89c6\u56fe\u6784\u5efa\u81ea\u5b9a\u89c6\u56fe\u3002\u4f7f\u7528\u89c6\u56fe\u4fee\u9970\u7b26\u914d\u7f6e\u8fd9\u4e9b\u89c6\u56fe\uff0c\u5e76\u5c06\u5b83\u4eec\u4e0e\u4f60\u7684\u6570\u636e\u6a21\u578b\u8fdb\u884c\u5173\u8054\u3002\u7136\u540e\uff0c\u5c06\u81ea\u5b9a\u89c6\u56fe\u653e\u7f6e\u5728\u4f60\u7684 App \u7684\u89c6\u56fe\u5c42\u6b21\u7ed3\u6784\u4e2d\u3002 <\/p>\n<h3> \u9075\u4ece View \u534f\u8bae <\/h3>\n<p> \u901a\u8fc7\u5b9a\u4e49\u4e00\u4e2a\u9075\u4ece <code>View<\/code> (\u82f1\u6587) \u534f\u8bae\u7684\u7ed3\u6784\u6765\u58f0\u660e\u81ea\u5b9a\u89c6\u56fe\u7c7b\u578b\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>MyView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span>}<\/span><\/span><\/code>\n\t\t\t\t\t<\/pre>\n<p> \u4e0e\u5176\u4ed6 Swift \u534f\u8bae (\u82f1\u6587) \u4e00\u6837\uff0c<code>View<\/code> (\u82f1\u6587) \u534f\u8bae\u63d0\u4f9b\u4e00\u4e2a\u529f\u80fd\u84dd\u56fe\uff0c\u5728\u672c\u4f8b\u4e2d\u662f SwiftUI \u5728\u5c4f\u5e55\u4e0a\u7ed8\u5236\u7684\u5143\u7d20\u7684\u884c\u4e3a\u3002\u534f\u8bae\u7684\u9075\u4ece\u5305\u542b\u4e86\u4e24\u4e2a\u65b9\u9762\uff0c\u89c6\u56fe\u5fc5\u987b\u6ee1\u8db3\u7684\u8981\u6c42\u4ee5\u53ca\u534f\u8bae\u63d0\u4f9b\u7684\u529f\u80fd\u3002\u5728\u6ee1\u8db3\u8981\u6c42\u540e\uff0c\u4f60\u53ef\u4ee5\u5c06\u81ea\u5b9a\u89c6\u56fe\u63d2\u5165\u89c6\u56fe\u5c42\u6b21\u7ed3\u6784\u4e2d\uff0c\u4ee5\u4f7f\u5b83\u6210\u4e3a\u4f60\u7684 App \u7528\u6237\u754c\u9762\u7684\u4e00\u90e8\u5206\u3002 <\/p>\n<h3> \u58f0\u660e Body <\/h3>\n<p> <code>View<\/code> (\u82f1\u6587) \u534f\u8bae\u7684\u4e3b\u8981\u8981\u6c42\u662f\u9075\u4ece\u7c7b\u578b\u5fc5\u987b\u5b9a\u4e49\u4e00\u4e2a <code>body<\/code> (\u82f1\u6587) \u8ba1\u7b97\u5c5e\u6027 (\u82f1\u6587)\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>MyView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span> <span>var<\/span> body: <span>some<\/span> <span>View<\/span> {<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span>}<\/span><\/span><\/code>\n\t\t\t\t\t<\/pre>\n<p> SwiftUI \u4f1a\u5728\u9700\u8981\u66f4\u65b0\u89c6\u56fe\u7684\u4efb\u4f55\u65f6\u5019\u8bfb\u53d6\u6b64\u5c5e\u6027\u7684\u503c\uff0c\u8fd9\u5728\u89c6\u56fe\u7684\u751f\u547d\u5468\u671f\u4e2d\u53ef\u80fd\u91cd\u590d\u53d1\u751f\uff0c\u901a\u5e38\u7528\u6765\u54cd\u5e94\u7528\u6237\u8f93\u5165\u6216\u7cfb\u7edf\u4e8b\u4ef6\u3002\u89c6\u56fe\u8fd4\u56de\u7684\u503c\u662f SwiftUI \u5728\u5c4f\u5e55\u4e0a\u7ed8\u5236\u7684\u4e00\u4e2a\u5143\u7d20\u3002 <\/p>\n<p> <code>View<\/code> (\u82f1\u6587) \u534f\u8bae\u7684\u6b21\u8981\u8981\u6c42\u662f\u9075\u4ece\u7c7b\u578b\u5fc5\u987b\u4e3a body \u5c5e\u6027\u6307\u660e\u4e00\u4e2a\u5173\u8054\u7c7b\u578b (\u82f1\u6587)\u3002\u7136\u800c\uff0c\u4f60\u4e0d\u662f\u8fdb\u884c\u663e\u5f0f\u58f0\u660e\uff0c\u800c\u662f\u4f7f\u7528 <code>some View<\/code> \u8bed\u6cd5\u5c06 body \u5c5e\u6027\u58f0\u660e\u4e3a\u4e0d\u900f\u660e\u7c7b\u578b (\u82f1\u6587)\uff0c\u4ee5\u4ec5\u6307\u660e\u8be5 body \u7684\u7c7b\u578b\u7b26\u5408 <code>View<\/code> (\u82f1\u6587)\u3002\u786e\u5207\u7c7b\u578b\u53d6\u51b3\u4e8e body \u7684\u5185\u5bb9\uff0c\u8be5\u5185\u5bb9\u4f1a\u968f\u7740\u4f60\u5728\u5f00\u53d1\u671f\u95f4\u7f16\u8f91 body \u800c\u53d8\u5316\u3002Swift \u4f1a\u81ea\u52a8\u63a8\u65ad\u786e\u5207\u7c7b\u578b\u3002 <\/p>\n<h3> \u7ec4\u5408\u89c6\u56fe\u7684\u5185\u5bb9 <\/h3>\n<p> \u901a\u8fc7\u5c06\u5185\u5bb9\u6dfb\u52a0\u5230\u89c6\u56fe\u7684 body \u5c5e\u6027\u6765\u63cf\u8ff0\u4f60\u7684\u89c6\u56fe\u7684\u5916\u89c2\u3002\u4f60\u53ef\u4ee5\u4ece SwiftUI \u63d0\u4f9b\u7684\u539f\u751f\u89c6\u56fe\u4ee5\u53ca\u4f60\u5728\u5176\u4ed6\u5730\u65b9\u5b9a\u4e49\u7684\u81ea\u5b9a\u89c6\u56fe\u7f16\u5199 body\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528\u5185\u5efa\u7684 <code>Text<\/code> (\u82f1\u6587) \u89c6\u56fe\u521b\u5efa\u4e00\u4e2a\u7ed8\u5236\u5b57\u7b26\u4e32\u201cHello, World!\u201d\u7684 body\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>MyView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span> <span>var<\/span> body: <span>some<\/span> <span>View<\/span> {<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Hello, World!\"<\/span>)<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span>}<\/span><\/span><\/code>\n\t\t\t\t\t<\/pre>\n<\/p>\n<p> \u9664\u4e86\u7528\u4e8e\u7279\u5b9a\u5185\u5bb9\u3001\u63a7\u4ef6\u548c\u6307\u793a\u5668\u7c7b\u578b\u7684\u89c6\u56fe\u5916\uff0c\u4f8b\u5982 <code>Text<\/code> (\u82f1\u6587)\u3001<code>Toggle<\/code> (\u82f1\u6587) \u548c <code>ProgressView<\/code> (\u82f1\u6587)\uff0cSwiftUI \u8fd8\u4f1a\u63d0\u4f9b\u4f60\u53ef\u7528\u6765\u6392\u5217\u5176\u4ed6\u89c6\u56fe\u7684\u539f\u751f\u89c6\u56fe\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u7528 <code>VStack<\/code> (\u82f1\u6587) \u5782\u76f4\u5806\u53e0\u4e24\u4e2a <code>Text<\/code> (\u82f1\u6587) \u89c6\u56fe\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>MyView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span> <span>var<\/span> body: <span>some<\/span> <span>View<\/span> {<\/span><\/span><span><span><\/span> <span> <span>VStack<\/span> {<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Hello, World!\"<\/span>)<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Glad to meet you.\"<\/span>)<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span>}<\/span><\/span><\/code>\n\t\t\t\t\t<\/pre>\n<\/p>\n<p> \u91c7\u7528\u591a\u4e2a\u8f93\u5165\u5b50\u89c6\u56fe\u7684\u89c6\u56fe (\u4f8b\u5982\uff0c\u4e0a\u8ff0\u793a\u4f8b\u4e2d\u7684 stack) \u901a\u5e38\u4f7f\u7528\u4e00\u4e2a\u4ee5 <code>ViewBuilder<\/code> (\u82f1\u6587) \u5c5e\u6027\u6807\u8bb0\u7684\u95ed\u5305\u6765\u6267\u884c\u6b64\u64cd\u4f5c\u3002\u8fd9\u6837\u53ef\u5f62\u6210\u5728\u8c03\u7528\u70b9\u4e0d\u9700\u8981\u9644\u52a0\u8bed\u6cd5\u7684\u591a\u8bed\u53e5\u95ed\u5305\u3002\u4f60\u4ec5\u9700\u8981\u8fde\u7eed\u5217\u51fa\u8f93\u5165\u89c6\u56fe\u3002 <\/p>\n<p> \u6709\u5173\u53ef\u7528\u5bb9\u5668\u89c6\u56fe\u7684\u5b8c\u6574\u5217\u8868\uff0c\u4ee5\u53ca\u5b83\u4eec\u7684\u7528\u6cd5\u8be6\u60c5\uff0c\u8bf7\u53c2\u9605\u201c\u89c6\u56fe\u5e03\u5c40\u4e0e\u5448\u73b0 (\u82f1\u6587)\u201d\u3002 <\/p>\n<h3> \u4f7f\u7528\u4fee\u9970\u7b26\u914d\u7f6e\u89c6\u56fe <\/h3>\n<p> \u82e5\u8981\u5728\u89c6\u56fe\u7684 body \u4e2d\u914d\u7f6e\u89c6\u56fe\uff0c\u53ef\u4ee5\u5e94\u7528\u89c6\u56fe\u4fee\u9970\u7b26\u3002\u4fee\u9970\u7b26\u53ea\u662f\u4e00\u79cd\u5728\u7279\u5b9a\u89c6\u56fe\u4e0a\u8c03\u7528\u7684\u65b9\u6cd5\u3002\u6b64\u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u5168\u65b0\u3001\u66f4\u6539\u540e\u7684\u89c6\u56fe\uff0c\u4ee5\u6709\u6548\u5730\u53d6\u4ee3\u89c6\u56fe\u5c42\u6b21\u7ed3\u6784\u4e2d\u7684\u539f\u59cb\u89c6\u56fe\u3002 <\/p>\n<p> \u4e3a\u6b64\uff0cSwiftUI \u901a\u8fc7\u4e00\u4e2a\u5927\u578b\u65b9\u6cd5\u96c6\u6269\u5c55\u4e86 <code>View<\/code> (\u82f1\u6587) \u534f\u8bae\u3002\u53ea\u8981\u9075\u4ece <code>View<\/code> (\u82f1\u6587) \u534f\u8bae\uff0c\u4e0d\u7ba1\u662f\u539f\u751f\u89c6\u56fe\u8fd8\u662f\u81ea\u5b9a\u89c6\u56fe\uff0c\u90fd\u53ef\u4f7f\u7528\u8fd9\u4e9b\u4ee5\u67d0\u79cd\u65b9\u5f0f\u6539\u53d8\u89c6\u56fe\u884c\u4e3a\u7684\u65b9\u6cd5\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u901a\u8fc7\u5e94\u7528 <code>font(_:)<\/code> (\u82f1\u6587) \u4fee\u9970\u7b26\u66f4\u6539\u6587\u672c\u89c6\u56fe\u7684\u5b57\u4f53\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>MyView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span> <span>var<\/span> body: <span>some<\/span> <span>View<\/span> {<\/span><\/span><span><span><\/span> <span> <span>VStack<\/span> {<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Hello, World!\"<\/span>)<\/span><\/span><span><span><\/span> <span> .font(.title)<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Glad to meet you.\"<\/span>)<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span>}<\/span><\/span><\/code>\n\t\t\t\t\t<\/pre>\n<\/p>\n<p> \u6709\u5173\u89c6\u56fe\u4fee\u9970\u7b26\u7684\u5de5\u4f5c\u539f\u7406\u4ee5\u53ca\u5982\u4f55\u5728\u89c6\u56fe\u4e0a\u4f7f\u7528\u5b83\u4eec\u7684\u66f4\u591a\u4fe1\u606f\uff0c\u8bf7\u53c2\u9605\u201c\u914d\u7f6e\u89c6\u56fe\u201d\u3002 <\/p>\n<h3> \u7ba1\u7406\u6570\u636e <\/h3>\n<p> \u82e5\u8981\u4e3a\u4f60\u7684\u89c6\u56fe\u63d0\u4f9b\u8f93\u5165\uff0c\u8bf7\u6dfb\u52a0\u5c5e\u6027\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u4f7f\u201cHello, World!\u201d\u5b57\u7b26\u4e32\u7684\u5b57\u4f53\u53d8\u4e3a\u53ef\u914d\u7f6e\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>MyView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span> <span>let<\/span> helloFont: <span>Font<\/span><\/span><\/span><span><span><\/span> <span> <\/span><\/span><span><span><\/span> <span> <span>var<\/span> body: <span>some<\/span> <span>View<\/span> {<\/span><\/span><span><span><\/span> <span> <span>VStack<\/span> {<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Hello, World!\"<\/span>)<\/span><\/span><span><span><\/span> <span> .font(helloFont)<\/span><\/span><span><span><\/span> <span> <span>Text<\/span>(<span>\"Glad to meet you.\"<\/span>)<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span> }<\/span><\/span><span><span><\/span> <span>}<\/span><\/span><\/code>\n\t\t\t\t\t<\/pre>\n<p> \u5982\u679c\u8f93\u5165\u503c\u53d1\u751f\u53d8\u5316\uff0cSwiftUI \u4f1a\u6ce8\u610f\u5230\u8fd9\u79cd\u53d8\u5316\u5e76\u4ec5\u91cd\u65b0\u7ed8\u5236\u53d7\u5f71\u54cd\u7684\u754c\u9762\u90e8\u5206\u3002\u8fd9\u53ef\u80fd\u6d89\u53ca\u91cd\u65b0\u521d\u59cb\u5316\u6574\u4e2a\u89c6\u56fe\uff0c\u4f46\u662f SwiftUI \u4f1a\u4e3a\u4f60\u5904\u7406\u6b64\u64cd\u4f5c\u3002 <\/p>\n<p> 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<\/p>\n<h3> \u5c06\u89c6\u56fe\u6dfb\u52a0\u5230\u89c6\u56fe\u5c42\u6b21\u7ed3\u6784 <\/h3>\n<p> \u5728\u5b9a\u4e49\u89c6\u56fe\u540e\uff0c\u4f60\u53ef\u4ee5\u5c06\u5176\u5e76\u5165\u5176\u4ed6\u89c6\u56fe\uff0c\u5c31\u50cf\u4f60\u5bf9\u539f\u751f\u89c6\u56fe\u6267\u884c\u7684\u64cd\u4f5c\u4e00\u6837\u3002\u8981\u6dfb\u52a0\u89c6\u56fe\uff0c\u4f60\u53ef\u4ee5\u5728\u5c42\u6b21\u7ed3\u6784\u4e2d\u60f3\u8981\u89c6\u56fe\u51fa\u73b0\u7684\u4f4d\u7f6e\u58f0\u660e\u89c6\u56fe\u3002\u4f8b\u5982\uff0c\u4f60\u53ef\u4ee5\u5c06 <code>MyView<\/code> \u7f6e\u4e8e\u4f60\u7684 App \u7684 <code>ContentView<\/code> \u4e2d\uff0c\u8fd9\u6837 Xcode \u5c06\u81ea\u52a8\u521b\u5efa\u5b83\u4f5c\u4e3a\u65b0\u7684 App \u7684\u6839\u89c6\u56fe\uff1a <\/p>\n<pre><code><span><span><\/span> <span><span><span>struct<\/span> <span>ContentView<\/span>: <span>View<\/span> <\/span>{<\/span><\/span><span><span><\/span> <span> <span>var<\/span> body: <span>some<\/span> <span>View<\/span> 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