{"rsdb":{"rid":"377780","subhead":"","postdate":"0","aid":"264308","fid":"89","uid":"1","topic":"1","content":"<div id=\"cnblogs_post_body\" class=\"blogpost-body cnblogs-markdown\"> \n <h1 id=\"\u524d\u8a00\">\u524d\u8a00<\/h1> \n <p><code>\u4eac\u559cAPP<\/code>\u6700\u65e9\u57282019\u5e74\u5f15\u5165\u4e86<code>Swift<\/code>\uff0c\u4f7f\u7528<code>Swift<\/code>\u5b8c\u6210\u4e86\u7b2c\u4e00\u4e2a\u8ba2\u5355\u6a21\u5757\u7684\u5f00\u53d1\u3002\u4e4b\u540e\u4e00\u5e74\u591a\u6211\u4eec\u6301\u7eed\u5728\u56e2\u961f\/\u516c\u53f8\u5185\u90e8\u63a8\u5e7f\u548c\u666e\u53ca<code>Swift<\/code>\uff0c\u76ee\u524d<code>Swift<\/code>\u5df2\u7ecf\u652f\u6491\u4e86<code>70%+<\/code>\u4ee5\u4e0a\u7684\u4e1a\u52a1\u3002\u901a\u8fc7\u4f7f\u7528<code>Swift<\/code>\u63d0\u9ad8\u4e86\u56e2\u961f\u5185\u540c\u5b66\u7684\u5f00\u53d1\u6548\u7387\uff0c\u540c\u65f6\u4e5f\u5e26\u6765\u4e86\u8d28\u91cf\u7684\u63d0\u5347\uff0c\u76ee\u524d\u6765\u81ea<code>Swift<\/code>\u7684Crash\u7684\u5360\u6bd4\u4e0d\u5230<code>1%<\/code>\u3002\u5728\u8fd9\u8fc7\u7a0b\u4e2d\u4e0d\u65ad\u7684\u5b66\u4e60\/\u5b9e\u8df5\uff0c\u56e2\u961f\u5185\u7684<code>Code Review<\/code>\uff0c\u4e5f\u5bf9\u5982\u4f55\u4f7f\u7528<code>Swift<\/code>\u6765\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\u6709\u66f4\u6df1\u7684\u7406\u89e3\u3002<\/p> \n <h1 id=\"swift\u7279\u6027\">Swift\u7279\u6027<\/h1> \n <p>\u5728\u8ba8\u8bba\u5982\u4f55\u4f7f\u7528<code>Swift<\/code>\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u6765\u770b\u770b<code>Swift<\/code>\u672c\u8eab\u76f8\u6bd4<code>ObjC<\/code>\u6216\u5176\u4ed6\u7f16\u7a0b\u8bed\u8a00\u6709\u4ec0\u4e48\u4f18\u52bf\u3002<code>Swift<\/code>\u6709\u4e09\u4e2a\u91cd\u8981\u7684\u7279\u6027\u5206\u522b\u662f<code>\u5bcc\u6709\u8868\u73b0\u529b<\/code>\/<code>\u5b89\u5168\u6027<\/code>\/<code>\u5feb\u901f<\/code>\uff0c\u63a5\u4e0b\u6765\u6211\u4eec\u5206\u522b\u4ece\u8fd9\u4e09\u4e2a\u7279\u6027\u7b80\u5355\u4ecb\u7ecd\u4e00\u4e0b\uff1a<\/p> \n <h3 id=\"\u5bcc\u6709\u8868\u73b0\u529b\">\u5bcc\u6709\u8868\u73b0\u529b<\/h3> \n <p><code>Swift<\/code>\u63d0\u4f9b\u66f4\u591a\u7684<code>\u7f16\u7a0b\u8303\u5f0f<\/code>\u548c<code>\u7279\u6027<\/code>\u652f\u6301\uff0c\u53ef\u4ee5\u7f16\u5199\u66f4\u5c11\u7684\u4ee3\u7801\uff0c\u800c\u4e14\u6613\u4e8e\u9605\u8bfb\u548c\u7ef4\u62a4\u3002<\/p> \n <ul> \n  <li><code>\u57fa\u7840\u7c7b\u578b<\/code>&nbsp;- \u5143\u7ec4\u3001Enum<code>\u5173\u8054\u7c7b\u578b<\/code><\/li> \n  <li><code>\u65b9\u6cd5<\/code>&nbsp;-&nbsp;<code>\u65b9\u6cd5\u91cd\u8f7d<\/code><\/li> \n  <li><code>protocol<\/code>&nbsp;- \u4e0d\u9650\u5236\u53ea\u652f\u6301<code>class<\/code>\u3001\u534f\u8bae<code>\u9ed8\u8ba4<\/code>\u5b9e\u73b0\u3001<code>\u7c7b<\/code>\u4e13\u5c5e\u534f\u8bae<\/li> \n  <li><code>\u6cdb\u578b<\/code>&nbsp;-&nbsp;<code>protocol<\/code>\u5173\u8054\u7c7b\u578b\u3001<code>where<\/code>\u5b9e\u73b0\u7c7b\u578b\u7ea6\u675f\u3001\u6cdb\u578b\u6269\u5c55<\/li> \n  <li><code>\u53ef\u9009\u503c<\/code>&nbsp;- \u53ef\u9009\u503c\u7533\u660e\u3001\u53ef\u9009\u94fe\u3001\u9690\u5f0f\u53ef\u9009\u503c<\/li> \n  <li><code>\u5c5e\u6027<\/code>&nbsp;- let\u3001lazy\u3001\u8ba1\u7b97\u5c5e\u6027`\u3001willset\/didset\u3001Property Wrappers<\/li> \n  <li><code>\u51fd\u6570\u5f0f\u7f16\u7a0b<\/code>&nbsp;- \u96c6\u5408<code>filter\/map\/reduce<\/code>\u65b9\u6cd5\uff0c\u63d0\u4f9b\u66f4\u591a\u6807\u51c6\u5e93\u65b9\u6cd5<\/li> \n  <li><code>\u5e76\u53d1<\/code>&nbsp;- async\/await\u3001actor<\/li> \n  <li><code>\u6807\u51c6\u5e93\u6846\u67b6<\/code>&nbsp;-&nbsp;<code>Combine<\/code>\u54cd\u5e94\u5f0f\u6846\u67b6\u3001<code>SwiftUI<\/code>\u7533\u660e\u5f0fUI\u6846\u67b6\u3001<code>Codable<\/code>JSON\u6a21\u578b\u8f6c\u6362<\/li> \n  <li><code>Result builder<\/code>&nbsp;- \u63cf\u8ff0\u5b9e\u73b0<code>DSL<\/code>\u7684\u80fd\u529b<\/li> \n  <li><code>\u52a8\u6001\u6027<\/code>&nbsp;- dynamicCallable\u3001dynamicMemberLookup<\/li> \n  <li><code>\u5176\u4ed6<\/code>&nbsp;- \u6269\u5c55\u3001subscript\u3001\u64cd\u4f5c\u7b26\u91cd\u5199\u3001\u5d4c\u5957\u7c7b\u578b\u3001\u533a\u95f4<\/li> \n  <li><code>Swift Package Manager<\/code>&nbsp;- \u57fa\u4e8eSwift\u7684\u5305\u7ba1\u7406\u5de5\u5177\uff0c\u53ef\u4ee5\u76f4\u63a5\u7528<code>Xcode<\/code>\u8fdb\u884c\u7ba1\u7406\u66f4\u65b9\u4fbf<\/li> \n  <li><code>struct<\/code>&nbsp;- \u521d\u59cb\u5316\u65b9\u6cd5\u81ea\u52a8\u8865\u9f50<\/li> \n  <li><code>\u7c7b\u578b\u63a8\u65ad<\/code>&nbsp;- \u901a\u8fc7\u7f16\u8bd1\u5668\u5f3a\u5927\u7684<code>\u7c7b\u578b\u63a8\u65ad<\/code>\u7f16\u5199\u4ee3\u7801\u65f6\u53ef\u4ee5\u51cf\u5c11\u5f88\u591a\u7c7b\u578b\u7533\u660e<\/li> \n <\/ul> \n <blockquote> \n  <p>\u63d0\u793a\uff1a\u7c7b\u578b\u63a8\u65ad\u540c\u65f6\u4e5f\u4f1a\u589e\u52a0\u4e00\u5b9a\u7684\u7f16\u8bd1<code>\u8017\u65f6<\/code>\uff0c\u4e0d\u8fc7<code>Swift<\/code>\u56e2\u961f\u4e5f\u5728\u4e0d\u65ad\u7684\u6539\u5584\u7f16\u8bd1\u901f\u5ea6\u3002<\/p> \n <\/blockquote> \n <h3 id=\"\u5b89\u5168\u6027\">\u5b89\u5168\u6027<\/h3> \n <h4 id=\"\u4ee3\u7801\u5b89\u5168\">\u4ee3\u7801\u5b89\u5168<\/h4> \n <ul> \n  <li><code>let\u5c5e\u6027<\/code>&nbsp;- \u4f7f\u7528<code>let<\/code>\u7533\u660e\u5e38\u91cf\u907f\u514d\u88ab\u4fee\u6539\u3002<\/li> \n  <li><code>\u503c\u7c7b\u578b<\/code>&nbsp;- \u503c\u7c7b\u578b\u53ef\u4ee5\u907f\u514d\u5728\u65b9\u6cd5\u8c03\u7528\u7b49<code>\u53c2\u6570\u4f20\u9012<\/code>\u8fc7\u7a0b\u4e2d\u72b6\u6001\u88ab\u4fee\u6539\u3002<\/li> \n  <li><code>\u8bbf\u95ee\u63a7\u5236<\/code>&nbsp;- \u901a\u8fc7<code>public<\/code>\u548c<code>final<\/code>\u9650\u5236\u6a21\u5757\u5916\u4f7f\u7528<code>class<\/code>\u4e0d\u80fd\u88ab<code>\u7ee7\u627f<\/code>\u548c<code>\u91cd\u5199<\/code>\u3002<\/li> \n  <li><code>\u5f3a\u5236\u5f02\u5e38\u5904\u7406<\/code>&nbsp;- \u65b9\u6cd5\u9700\u8981\u629b\u51fa\u5f02\u5e38\u65f6\uff0c\u9700\u8981\u7533\u660e\u4e3a<code>throw<\/code>\u65b9\u6cd5\u3002\u5f53\u8c03\u7528\u53ef\u80fd\u4f1a<code>throw<\/code>\u5f02\u5e38\u7684\u65b9\u6cd5\uff0c\u9700\u8981\u5f3a\u5236\u6355\u83b7\u5f02\u5e38\u907f\u514d\u5c06\u5f02\u5e38\u66b4\u9732\u5230\u4e0a\u5c42\u3002<\/li> \n  <li><code>\u6a21\u5f0f\u5339\u914d<\/code>&nbsp;- \u901a\u8fc7\u6a21\u5f0f\u5339\u914d\u68c0\u6d4b<code>switch<\/code>\u4e2d\u672a\u5904\u7406\u7684case\u3002<\/li> \n <\/ul> \n <h4 id=\"\u7c7b\u578b\u5b89\u5168\">\u7c7b\u578b\u5b89\u5168<\/h4> \n <ul> \n  <li><code>\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362<\/code>&nbsp;- \u7981\u6b62<code>\u9690\u5f0f\u7c7b\u578b\u8f6c\u6362<\/code>\u907f\u514d\u8f6c\u6362\u4e2d\u5e26\u6765\u7684\u5f02\u5e38\u95ee\u9898\u3002\u540c\u65f6\u7c7b\u578b\u8f6c\u6362\u4e0d\u4f1a\u5e26\u6765<code>\u989d\u5916<\/code>\u7684\u8fd0\u884c\u65f6\u6d88\u8017\u3002\u3002<\/li> \n <\/ul> \n <blockquote> \n  <p>\u63d0\u793a\uff1a\u7f16\u5199<code>ObjC<\/code>\u4ee3\u7801\u65f6\uff0c\u6211\u4eec\u901a\u5e38\u4f1a\u5728\u7f16\u7801\u65f6\u6dfb\u52a0\u7c7b\u578b\u68c0\u67e5\u907f\u514d\u8fd0\u884c\u65f6\u5d29\u6e83\u5bfc\u81f4<code>Crash<\/code>\u3002<\/p> \n <\/blockquote> \n <ul> \n  <li><code>KeyPath<\/code>&nbsp;-&nbsp;<code>KeyPath<\/code>\u76f8\u6bd4\u4f7f\u7528<code>\u5b57\u7b26\u4e32<\/code>\u53ef\u4ee5\u63d0\u4f9b\u5c5e\u6027\u540d\u548c\u7c7b\u578b\u4fe1\u606f\uff0c\u53ef\u4ee5\u5229\u7528\u7f16\u8bd1\u5668\u68c0\u67e5\u3002<\/li> \n  <li><code>\u6cdb\u578b<\/code>&nbsp;- \u63d0\u4f9b<code>\u6cdb\u578b<\/code>\u548c\u534f\u8bae<code>\u5173\u8054\u7c7b\u578b<\/code>\uff0c\u53ef\u4ee5\u7f16\u5199\u51fa\u7c7b\u578b\u5b89\u5168\u7684\u4ee3\u7801\u3002\u76f8\u6bd4<code>Any<\/code>\u53ef\u4ee5\u66f4\u591a\u5229\u7528\u7f16\u8bd1\u65f6\u68c0\u67e5\u53d1\u73b0\u7c7b\u578b\u95ee\u9898\u3002<\/li> \n  <li><code>Enum\u5173\u8054\u7c7b\u578b<\/code>&nbsp;- \u901a\u8fc7\u7ed9\u7279\u5b9a\u679a\u4e3e\u6307\u5b9a\u7c7b\u578b\u907f\u514d\u4f7f\u7528<code>Any<\/code>\u3002<\/li> \n <\/ul> \n <h4 id=\"\u5185\u5b58\u5b89\u5168\">\u5185\u5b58\u5b89\u5168<\/h4> \n <ul> \n  <li><code>\u7a7a\u5b89\u5168<\/code>&nbsp;- \u901a\u8fc7\u6807\u8bc6\u53ef\u9009\u503c\u907f\u514d<code>\u7a7a\u6307\u9488<\/code>\u5e26\u6765\u7684\u5f02\u5e38\u95ee\u9898<\/li> \n  <li><code>ARC<\/code>&nbsp;- \u4f7f\u7528<code>\u81ea\u52a8<\/code>\u5185\u5b58\u7ba1\u7406\u907f\u514d<code>\u624b\u52a8<\/code>\u7ba1\u7406\u5185\u5b58\u5e26\u6765\u7684\u5404\u79cd\u5185\u5b58\u95ee\u9898<\/li> \n  <li><code>\u5f3a\u5236\u521d\u59cb\u5316<\/code>&nbsp;- \u53d8\u91cf\u4f7f\u7528\u524d\u5fc5\u987b<code>\u521d\u59cb\u5316<\/code><\/li> \n  <li><code>\u5185\u5b58\u72ec\u5360\u8bbf\u95ee<\/code>&nbsp;- \u901a\u8fc7\u7f16\u8bd1\u5668\u68c0\u67e5\u53d1\u73b0\u6f5c\u5728\u7684\u5185\u5b58\u51b2\u7a81\u95ee\u9898<\/li> \n <\/ul> \n <h4 id=\"\u7ebf\u7a0b\u5b89\u5168\">\u7ebf\u7a0b\u5b89\u5168<\/h4> \n <ul> \n  <li><code>\u503c\u7c7b\u578b<\/code>&nbsp;- \u66f4\u591a\u4f7f\u7528\u503c\u7c7b\u578b\u51cf\u5c11\u5728\u591a\u7ebf\u7a0b\u4e2d\u9047\u5230\u7684<code>\u6570\u636e\u7ade\u4e89<\/code>\u95ee\u9898<\/li> \n  <li><code>async\/await<\/code>&nbsp;- \u63d0\u4f9b<code>async<\/code>\u51fd\u6570\u4f7f\u6211\u4eec\u53ef\u4ee5\u7528\u7ed3\u6784\u5316\u7684\u65b9\u5f0f\u7f16\u5199\u5e76\u53d1\u64cd\u4f5c\u3002\u907f\u514d\u57fa\u4e8e<code>\u95ed\u5305<\/code>\u7684\u5f02\u6b65\u65b9\u5f0f\u5e26\u6765\u7684\u5185\u5b58<code>\u5faa\u73af\u5f15\u7528<\/code>\u548c\u65e0\u6cd5\u629b\u51fa\u5f02\u5e38\u7684\u95ee\u9898<\/li> \n  <li><code>Actor<\/code>&nbsp;- \u63d0\u4f9b<code>Actor<\/code>\u6a21\u578b\u907f\u514d\u591a\u7ebf\u7a0b\u5f00\u53d1\u4e2d\u8fdb\u884c\u6570\u636e\u5171\u4eab\u65f6\u53d1\u751f\u7684\u6570\u636e\u7ade\u4e89\u95ee\u9898\uff0c\u540c\u65f6\u907f\u514d\u5728\u4f7f\u7528\u9501\u65f6\u5e26\u6765\u7684\u6b7b\u9501\u7b49\u95ee\u9898<\/li> \n <\/ul> \n <h3 id=\"\u5feb\u901f\">\u5feb\u901f<\/h3> \n <ul> \n  <li><code>\u503c\u7c7b\u578b<\/code>&nbsp;- \u76f8\u6bd4<code>class<\/code>\u4e0d\u9700\u8981\u989d\u5916\u7684<code>\u5806\u5185\u5b58<\/code>\u5206\u914d\/\u91ca\u653e\u548c\u66f4\u5c11\u7684\u5185\u5b58\u6d88\u8017<\/li> \n  <li><code>\u65b9\u6cd5\u9759\u6001\u6d3e\u53d1<\/code>&nbsp;- \u65b9\u6cd5\u8c03\u7528\u652f\u6301<code>\u9759\u6001<\/code>\u8c03\u7528\u76f8\u6bd4\u539f\u6709ObjC<code>\u6d88\u606f\u8f6c\u53d1<\/code>\u8c03\u7528\u6027\u80fd\u66f4\u597d<\/li> \n  <li><code>\u7f16\u8bd1\u5668\u4f18\u5316<\/code>&nbsp;- Swift\u7684<code>\u9759\u6001\u6027<\/code>\u53ef\u4ee5\u4f7f\u7f16\u8bd1\u5668\u505a\u66f4\u591a\u4f18\u5316\u3002\u4f8b\u5982<code>Tree Shaking<\/code>\u76f8\u5173\u4f18\u5316\u79fb\u9664\u672a\u4f7f\u7528\u7684\u7c7b\u578b\/\u65b9\u6cd5\u7b49\u51cf\u5c11\u4e8c\u8fdb\u5236\u6587\u4ef6\u5927\u5c0f\u3002\u4f7f\u7528<code>\u9759\u6001\u6d3e\u53d1<\/code>\/<code>\u65b9\u6cd5\u5185\u8054\u4f18\u5316<\/code>\/<code>\u6cdb\u578b\u7279\u5316<\/code>\/<code>\u5199\u65f6\u590d\u5236<\/code>\u7b49\u4f18\u5316\u63d0\u9ad8\u8fd0\u884c\u65f6\u6027\u80fd<\/li> \n <\/ul> \n <blockquote> \n  <p>\u63d0\u793a\uff1a<code>ObjC<\/code>\u6d88\u606f\u6d3e\u53d1\u4f1a\u5bfc\u81f4\u7f16\u8bd1\u5668\u65e0\u6cd5\u8fdb\u884c\u79fb\u9664\u65e0\u7528\u65b9\u6cd5\/\u7c7b\u7684\u4f18\u5316\uff0c\u7f16\u8bd1\u5668\u5e76\u4e0d\u77e5\u9053\u662f\u5426\u53ef\u80fd\u88ab\u7528\u5230\u3002<\/p> \n <\/blockquote> \n <ul> \n  <li><code>ARC\u4f18\u5316<\/code>&nbsp;- \u867d\u7136\u548c<code>ObjC<\/code>\u4e00\u6837\u90fd\u662f\u4f7f\u7528<code>ARC<\/code>\uff0c<code>Swift<\/code>\u901a\u8fc7\u7f16\u8bd1\u5668\u4f18\u5316\uff0c\u53ef\u4ee5\u8fdb\u884c\u66f4\u5feb\u7684\u5185\u5b58\u56de\u6536\u548c\u66f4\u5c11\u7684\u5185\u5b58\u5f15\u7528\u8ba1\u6570\u7ba1\u7406<\/li> \n <\/ul> \n <blockquote> \n  <p>\u63d0\u793a\uff1a \u76f8\u6bd4<code>ObjC<\/code>\uff0cSwift\u5185\u90e8\u4e0d\u9700\u8981\u4f7f\u7528<code>autorelease<\/code>\u8fdb\u884c\u7ba1\u7406\u3002<\/p> \n <\/blockquote> \n <h1 id=\"\u4ee3\u7801\u8d28\u91cf\u6307\u6807\">\u4ee3\u7801\u8d28\u91cf\u6307\u6807<\/h1> \n <p><img src=\"https:\/\/oscimg.oschina.net\/oscnet\/up-6f28bb4fcff4d48520c4d0f1ff4f9fc57f2.png\" alt=\"\" loading=\"lazy\" \/><\/p> \n <p>\u4ee5\u4e0a\u662f\u4e00\u4e9b\u5e38\u89c1\u7684\u4ee3\u7801\u8d28\u91cf\u6307\u6807\u3002\u6211\u4eec\u7684\u76ee\u6807\u662f\u5982\u4f55\u66f4\u597d\u7684\u4f7f\u7528<code>Swift<\/code>\u7f16\u5199\u51fa\u7b26\u5408\u4ee3\u7801\u8d28\u91cf\u6307\u6807\u8981\u6c42\u7684\u4ee3\u7801\u3002<\/p> \n <blockquote> \n  <p>\u63d0\u793a\uff1a\u672c\u6587\u4e0d\u6d89\u53ca\u8bbe\u8ba1\u6a21\u5f0f\/\u67b6\u6784\uff0c\u66f4\u591a\u5173\u6ce8\u5982\u4f55\u901a\u8fc7\u5408\u7406\u4f7f\u7528<code>Swift<\/code>\u7279\u6027\u505a\u5c40\u90e8\u4ee3\u7801\u6bb5\u7684\u91cd\u6784\u3002<\/p> \n <\/blockquote> \n <h2 id=\"\u4e00\u4e9b\u4e0d\u9519\u7684\u5b9e\u8df5\">\u4e00\u4e9b\u4e0d\u9519\u7684\u5b9e\u8df5<\/h2> \n <h3 id=\"\u5229\u7528\u7f16\u8bd1\u68c0\u67e5\">\u5229\u7528\u7f16\u8bd1\u68c0\u67e5<\/h3> \n <h4 id=\"\u51cf\u5c11\u4f7f\u7528anyanyobject\">\u51cf\u5c11\u4f7f\u7528<code>Any\/AnyObject<\/code><\/h4> \n <p>\u56e0\u4e3a<code>Any\/AnyObject<\/code>\u7f3a\u5c11\u660e\u786e\u7684\u7c7b\u578b\u4fe1\u606f\uff0c\u7f16\u8bd1\u5668\u65e0\u6cd5\u8fdb\u884c\u7c7b\u578b\u68c0\u67e5\uff0c\u4f1a\u5e26\u6765\u4e00\u4e9b\u95ee\u9898\uff1a<\/p> \n <ul> \n  <li>\u7f16\u8bd1\u5668\u65e0\u6cd5\u68c0\u67e5\u7c7b\u578b\u662f\u5426\u6b63\u786e\u4fdd\u8bc1\u7c7b\u578b\u5b89\u5168<\/li> \n  <li>\u4ee3\u7801\u4e2d\u5927\u91cf\u7684<code>as?<\/code>\u8f6c\u6362<\/li> \n  <li>\u7c7b\u578b\u7684\u7f3a\u5931\u5bfc\u81f4\u7f16\u8bd1\u5668\u65e0\u6cd5\u505a\u4e00\u4e9b\u6f5c\u5728\u7684<code>\u7f16\u8bd1\u4f18\u5316<\/code><\/li> \n <\/ul> \n <p>\u4f7f\u7528<code>as?<\/code>\u5e26\u6765\u7684\u95ee\u9898<\/p> \n <p>\u5f53\u4f7f\u7528<code>Any\/AnyObject<\/code>\u65f6\u4f1a\u9891\u7e41\u4f7f\u7528<code>as?<\/code>\u8fdb\u884c\u7c7b\u578b\u8f6c\u6362\u3002\u8fd9\u597d\u50cf\u6ca1\u4ec0\u4e48\u95ee\u9898\u56e0\u4e3a\u4f7f\u7528<code>as?<\/code>\u5e76\u4e0d\u4f1a\u5bfc\u81f4\u7a0b\u5e8f<code>Crash<\/code>\u3002\u4e0d\u8fc7\u4ee3\u7801\u9519\u8bef\u81f3\u5c11\u5e94\u8be5\u5206\u4e3a\u4e24\u7c7b\uff0c\u4e00\u7c7b\u662f\u7a0b\u5e8f\u672c\u8eab\u7684\u9519\u8bef\u901a\u5e38\u4f1a\u5f15\u53d1Crash\uff0c\u53e6\u5916\u4e00\u79cd\u662f\u4e1a\u52a1\u903b\u8f91\u9519\u8bef\u3002\u4f7f\u7528<code>as?<\/code>\u53ea\u662f\u907f\u514d\u4e86\u7a0b\u5e8f\u9519\u8bef<code>Crash<\/code>\uff0c\u4f46\u662f\u5e76\u4e0d\u80fd\u9632\u6b62\u4e1a\u52a1\u903b\u8f91\u9519\u8bef\u3002<\/p> \n <pre><code>func do(data: Any?) {\n    guard let string = data as? String else {\n        return\n    }\n    \/\/ \n}\n\ndo(1)\ndo(&quot;&quot;)\n\n\n<\/code><\/pre> \n <p>\u4ee5\u4e0a\u9762\u7684\u4f8b\u5b50\u4e3a\u4f8b\uff0c\u6211\u4eec\u8fdb\u884c\u4e86<code>as?<\/code>\u8f6c\u6362\uff0c\u5f53<code>data<\/code>\u4e3a<code>String<\/code>\u65f6\u624d\u4f1a\u8fdb\u884c\u5904\u7406\u3002\u4f46\u662f\u5f53<code>do<\/code>\u65b9\u6cd5\u5185<code>String<\/code>\u7c7b\u578b\u53d1\u751f\u4e86\u6539\u53d8\u51fd\u6570\uff0c\u4f7f\u7528\u65b9\u5e76\u4e0d\u77e5\u9053\u5df2\u53d8\u66f4\u6ca1\u6709\u505a\u76f8\u5e94\u7684\u9002\u914d\uff0c\u8fd9\u65f6\u5019\u5c31\u4f1a\u9020\u6210\u4e1a\u52a1\u903b\u8f91\u7684\u9519\u8bef\u3002<\/p> \n <blockquote> \n  <p>\u63d0\u793a\uff1a\u8fd9\u7c7b\u9519\u8bef\u901a\u5e38\u66f4\u96be\u53d1\u73b0\uff0c\u8fd9\u4e5f\u662f\u6211\u4eec\u5728\u4e00\u6b21\u771f\u5b9e<code>bug<\/code>\u573a\u666f\u9047\u5230\u7684\u3002<\/p> \n <\/blockquote> \n <h4 id=\"\u4f7f\u7528\u81ea\u5b9a\u4e49\u7c7b\u578b\u4ee3\u66ffdictionary\">\u4f7f\u7528<code>\u81ea\u5b9a\u4e49\u7c7b\u578b<\/code>\u4ee3\u66ff<code>Dictionary<\/code><\/h4> \n <p>\u4ee3\u7801\u4e2d\u5927\u91cf<code>Dictionary<\/code>\u6570\u636e\u7ed3\u6784\u4f1a\u964d\u4f4e\u4ee3\u7801\u53ef\u7ef4\u62a4\u6027\uff0c\u540c\u65f6\u5e26\u6765\u6f5c\u5728\u7684<code>bug<\/code>\uff1a<\/p> \n <ul> \n  <li><code>key<\/code>\u9700\u8981\u5b57\u7b26\u4e32\u786c\u7f16\u7801\uff0c\u7f16\u8bd1\u65f6\u65e0\u6cd5\u68c0\u67e5<\/li> \n  <li><code>value<\/code>\u6ca1\u6709\u7c7b\u578b\u9650\u5236\u3002<code>\u4fee\u6539<\/code>\u65f6\u7c7b\u578b\u65e0\u6cd5\u9650\u5236\uff0c\u8bfb\u53d6\u65f6\u9700\u8981\u91cd\u590d\u7c7b\u578b\u8f6c\u6362\u548c\u89e3\u5305\u64cd\u4f5c<\/li> \n  <li>\u65e0\u6cd5\u5229\u7528<code>\u7a7a\u5b89\u5168<\/code>\u7279\u6027\uff0c\u6307\u5b9a\u67d0\u4e2a\u5c5e\u6027\u5fc5\u987b\u6709\u503c<\/li> \n <\/ul> \n <blockquote> \n  <p>\u63d0\u793a\uff1a<code>\u81ea\u5b9a\u4e49\u7c7b\u578b<\/code>\u8fd8\u6709\u4e2a\u597d\u5904\uff0c\u4f8b\u5982<code>JSON<\/code>\u8f6c<code>\u81ea\u5b9a\u4e49\u7c7b\u578b<\/code>\u65f6\u4f1a\u8fdb\u884c<code>\u7c7b\u578b\/nil\/\u5c5e\u6027\u540d<\/code>\u68c0\u67e5\uff0c\u53ef\u4ee5\u907f\u514d\u5c06\u9519\u8bef\u6570\u636e\u4e22\u5230\u4e0b\u4e00\u5c42\u3002<\/p> \n <\/blockquote> \n <p>\u4e0d\u63a8\u8350<\/p> \n <pre><code>let dic: [String: Any]","orderid":"0","title":"\u4e07\u5b57\u957f\u6587\u8be6\u89e3\u5982\u4f55\u4f7f\u7528Swift\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf(\u4e00)","smalltitle":"","mid":"0","fname":"Swift","special_id":"0","bak_id":"0","info":"0","hits":"506","pages":"6","comments":"0","posttime":"2023-07-23 13:24:53","list":"1690089893","username":"admin","author":"","copyfrom":"","copyfromurl":"","titlecolor":"","fonttype":"0","titleicon":"0","picurl":"https:\/\/www.cppentry.com\/upload_files\/","ispic":"0","yz":"1","yzer":"","yztime":"0","levels":"0","levelstime":"0","keywords":"<A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%CE%C4%CF%EA%BD%E2' target=_blank>\u6587\u8be6\u89e3<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%BA%CE%CA%B9%D3%C3' target=_blank>\u4f55\u4f7f\u7528<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=Swift' target=_blank>Swift<\/A> <A HREF='https:\/\/www.cppentry.com\/do\/search.php?type=keyword&keyword=%B8%DF%B4%FA%C2%EB' target=_blank>\u9ad8\u4ee3\u7801<\/A>","jumpurl":"","iframeurl":"","style":"","template":"a:3:{s:4:\"head\";s:0:\"\";s:4:\"foot\";s:0:\"\";s:8:\"bencandy\";s:0:\"\";}","target":"0","ip":"119.59.235.169","lastfid":"0","money":"0","buyuser":"","passwd":"","allowdown":"","allowview":"","editer":"","edittime":"0","begintime":"0","endtime":"0","description":"\u4e07\u5b57\u957f\u6587\u8be6\u89e3\u5982\u4f55\u4f7f\u7528Swift\u63d0\u9ad8\u4ee3\u7801\u8d28\u91cf","lastview":"1715457605","digg_num":"0","digg_time":"0","forbidcomment":"0","ifvote":"0","heart":"","htmlname":"","city_id":"0"},"page":"1"}