{"id":7254,"date":"2022-09-05T10:22:17","date_gmt":"2022-09-05T02:22:17","guid":{"rendered":"http:\/\/123.57.164.21\/?p=7254"},"modified":"2022-09-06T22:16:39","modified_gmt":"2022-09-06T14:16:39","slug":"swift-%e4%b8%adobjc%e4%bb%a5%e5%8f%8adynamic%e7%9a%84%e4%bd%bf%e7%94%a8","status":"publish","type":"post","link":"https:\/\/92it.top\/?p=7254","title":{"rendered":"Swift \u4e2d@Objc\u4ee5\u53caDynamic\u7684\u4f7f\u7528"},"content":{"rendered":"\n<p><strong>@Objc<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Objective-C \u548c Swift \u5728\u5e95\u5c42\u4f7f\u7528\u7684\u662f\u4e24\u5957\u5b8c\u5168\u4e0d\u540c\u7684\u673a\u5236\uff0cCocoa \u4e2d\u7684 Objective-C \u5bf9\u8c61\u662f\u57fa\u4e8e\u8fd0\u884c\u65f6\u7684\uff0c\u5b83\u4ece\u9aa8\u5b50\u91cc\u9075\u5faa\u4e86 KVC (Key-Value Coding\uff0c\u901a\u8fc7\u7c7b\u4f3c\u5b57\u5178\u7684\u65b9\u5f0f\u5b58\u50a8\u5bf9\u8c61\u4fe1\u606f) \u4ee5\u53ca\u52a8\u6001\u6d3e\u53d1 (Dynamic Dispatch\uff0c\u5728\u8fd0\u884c\u8c03\u7528\u65f6\u518d\u51b3\u5b9a\u5b9e\u9645\u8c03\u7528\u7684\u5177\u4f53\u5b9e\u73b0)\u3002\u800c Swift \u4e3a\u4e86\u8ffd\u6c42\u6027\u80fd\uff0c\u5982\u679c\u6ca1\u6709\u7279\u6b8a\u9700\u8981\u7684\u8bdd\uff0c\u662f\u4e0d\u4f1a\u5728\u8fd0\u884c\u65f6\u518d\u6765\u51b3\u5b9a\u8fd9\u4e9b\u7684\u3002\u4e5f\u5c31\u662f\u8bf4\uff0cSwift \u7c7b\u578b\u7684\u6210\u5458\u6216\u8005\u65b9\u6cd5\u5728\u7f16\u8bd1\u65f6\u5c31\u5df2\u7ecf\u51b3\u5b9a\uff0c\u800c\u8fd0\u884c\u65f6\u4fbf\u4e0d\u518d\u9700\u8981\u7ecf\u8fc7\u4e00\u6b21\u67e5\u627e\uff0c\u800c\u53ef\u4ee5\u76f4\u63a5\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>\u663e\u800c\u6613\u89c1\uff0c\u8fd9\u5e26\u6765\u7684\u95ee\u9898\u662f\u5982\u679c\u6211\u4eec\u8981\u4f7f\u7528 Objective-C \u7684\u4ee3\u7801\u6216\u8005\u7279\u6027\u6765\u8c03\u7528\u7eaf Swift \u7684\u7c7b\u578b\u65f6\u5019\uff0c\u6211\u4eec\u4f1a\u56e0\u4e3a\u627e\u4e0d\u5230\u6240\u9700\u8981\u7684\u8fd9\u4e9b\u8fd0\u884c\u65f6\u4fe1\u606f\uff0c\u800c\u5bfc\u81f4\u5931\u8d25\u3002\u89e3\u51b3\u8d77\u6765\u4e5f\u5f88\u7b80\u5355\uff0c\u5728 Swift \u7c7b\u578b\u6587\u4ef6\u4e2d\uff0c\u6211\u4eec\u53ef\u4ee5\u5c06\u9700\u8981\u66b4\u9732\u7ed9 Objective-C \u4f7f\u7528\u7684\u4efb\u4f55\u5730\u65b9 (\u5305\u62ec\u7c7b\uff0c\u5c5e\u6027\u548c\u65b9\u6cd5\u7b49) \u7684\u58f0\u660e\u524d\u9762\u52a0\u4e0a@objc\u4fee\u9970\u7b26\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\u8fd9\u4e2a\u6b65\u9aa4\u53ea\u9700\u8981\u5bf9\u90a3\u4e9b\u4e0d\u662f\u7ee7\u627f\u81eaNSObject\u7684\u7c7b\u578b\u8fdb\u884c\uff0c\u5982\u679c\u4f60\u7528 Swift \u5199\u7684 class \u662f\u7ee7\u627f\u81eaNSObject\u7684\u8bdd\uff0cSwift \u4f1a\u9ed8\u8ba4\u81ea\u52a8\u4e3a\u6240\u6709\u7684\u975e private \u7684\u7c7b\u548c\u6210\u5458\u52a0\u4e0a@objc\u3002\u8fd9\u5c31\u662f\u8bf4\uff0c\u5bf9\u4e00\u4e2aNSObject\u7684\u5b50\u7c7b\uff0c\u4f60\u53ea\u9700\u8981\u5bfc\u5165\u76f8\u5e94\u7684\u5934\u6587\u4ef6\u5c31\u53ef\u4ee5\u5728 Objective-C \u91cc\u4f7f\u7528\u8fd9\u4e2a\u7c7b\u4e86<\/p>\n\n\n\n<p><strong><span class=\"has-inline-color has-vivid-red-color\">Objective-C \u4e2d\u6240\u6709\u7c7b\u90fd\u7ee7\u627f\u81eaNSObject\uff0cSwift \u4e2d\u7684\u7c7b\u5982\u679c\u8981\u4f9b Objective-C \u8c03\u7528\uff0c\u5fc5\u987b\u4e5f\u7ee7\u627f\u81eaNSObject\u3002<\/span><\/strong><\/p>\n\n\n\n<p>@objc\u4fee\u9970\u7b26\u7684\u6839\u672c\u76ee\u7684\u662f\u7528\u6765\u66b4\u9732\u63a5\u53e3\u7ed9 Objective-C \u7684\u8fd0\u884c\u65f6\uff08\u7c7b\u3001\u534f\u8bae\u3001\u5c5e\u6027\u548c\u65b9\u6cd5\u7b49\uff09<\/p>\n\n\n\n<p>\u6dfb\u52a0@objc\u4fee\u9970\u7b26\u5e76\u4e0d\u610f\u5473\u7740\u8fd9\u4e2a\u65b9\u6cd5\u6216\u8005\u5c5e\u6027\u4f1a\u91c7\u7528 Objective-C \u7684\u65b9\u5f0f\u53d8\u6210\u52a8\u6001\u6d3e\u53d1\uff0cSwift \u4f9d\u7136\u53ef\u80fd\u4f1a\u5c06\u5176\u4f18\u5316\u4e3a\u9759\u6001\u8c03\u7528<\/p>\n\n\n\n<p>@objc \u4fee\u9970\u7b26\u7684\u9690\u5f0f\u6dfb\u52a0\uff1a<\/p>\n\n\n\n<p>Swift 3 \u4e2d\u7ee7\u627f\u81eaNSObject\u7684\u7c7b\uff0c\u4e0d\u9700\u8981\u624b\u52a8\u6dfb\u52a0@objc\uff0c\u7f16\u8bd1\u5668\u4f1a\u7ed9\u6240\u6709\u7684\u975eprivate\u7684\u7c7b\u548c\u6210\u5458\u52a0\u4e0a@objc\uff0cprivate\u63a5\u53e3\u60f3\u8981\u66b4\u9732\u7ed9 Objective-C \u9700\u8981@objc\u7684\u4fee\u9970<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">button.addTarget(self, action: #selector(backButtonTapped), for: .touchUpInside)\n@objc private func backButtonTapped() { }\nfunc backButtonTapped() { }\n<\/pre>\n\n\n\n<p>Swift 4 \u4e2d\u7ee7\u627f\u81eaNSObject\u7684\u7c7b\u7684\u9690\u5f0f@objc\u81ea\u52a8\u6dfb\u52a0\uff0c\u53ea\u4f1a\u53d1\u751f\u5728\u4ee5\u4e0b\u56db\u79cd\u60c5\u51b5\uff1a<\/p>\n\n\n\n<ul><li>1.\u91cd\u5199\u4e86\u7236\u7c7b\u7684 Objective-C \u65b9\u6cd5<\/li><li>2.\u5b9e\u73b0\u4e86\u4e00\u4e2a Objective-C \u7684\u534f\u8bae<\/li><li>3.@IBAction\u6216@IBOutlet\u5173\u952e\u5b57\u7684\u4fee\u9970<\/li><li>4.@NSManaged\u5173\u952e\u5b57\u7684\u4fee\u9970<\/li><\/ul>\n\n\n\n<p>@objc\u4fee\u9970\u7b26\u7684\u53e6\u4e00\u4e2a\u4f5c\u7528\u662f\u4e3a Objective-C \u4fa7\u91cd\u65b0\u58f0\u660e\u65b9\u6cd5\u6216\u8005\u53d8\u91cf\u7684\u540d\u5b57\u3002\u867d\u7136\u7edd\u5927\u90e8\u5206\u65f6\u5019\u81ea\u52a8\u8f6c\u6362\u7684\u65b9\u6cd5\u540d\u5df2\u7ecf\u8db3\u591f\u597d\u7528 (\u6bd4\u5982\u4f1a\u5c06 Swift \u4e2d\u7c7b\u4f3cinit(name: String)\u7684\u65b9\u6cd5\u8f6c\u6362\u6210-initWithName:(NSString *)name\u8fd9\u6837)\uff0c\u4f46\u662f\u6709\u65f6\u5019\u6211\u4eec\u8fd8\u662f\u671f\u671b Objective-C \u91cc\u4f7f\u7528\u548c Swift \u4e2d\u4e0d\u4e00\u6837\u7684\u65b9\u6cd5\u540d\u6216\u8005\u7c7b\u7684\u540d\u5b57\uff0c\u6bd4\u5982 Swift \u91cc\u8fd9\u6837\u7684\u4e00\u4e2a\u7c7b\uff1a<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class\u6211\u7684\u7c7b:NSObject{\n         func \u6253\u62db\u547c(\u540d\u5b57:String){\n          print(\"\u54c8\u55bd\uff0c\\(\u540d\u5b57)\")\n}}\n\n\u6211\u7684\u7c7b().\u6253\u62db\u547c(\"\u5c0f\u660e\")\n<\/pre>\n\n\n\n<p>\u53e6\u5916\uff0c\u6b63\u5982\u4e0a\u9762\u6240\u8bf4\u7684\u4ee5\u53ca\u5728<a href=\"https:\/\/links.jianshu.com\/go?to=http%3A%2F%2Fswifter.tips%2Fselector%2F\" target=\"_blank\" rel=\"noreferrer noopener\">Selector<\/a>\u4e00\u8282\u4e2d\u6240\u63d0\u5230\u7684\uff0c\u5373\u4f7f\u662fNSObject\u7684\u5b50\u7c7b\uff0cSwift \u4e5f\u4e0d\u4f1a\u5728\u88ab\u6807\u8bb0\u4e3aprivate\u7684\u65b9\u6cd5\u6216\u6210\u5458\u4e0a\u81ea\u52a8\u52a0@objc\uff0c\u4ee5\u4fdd\u8bc1\u5c3d\u91cf\u4e0d\u4f7f\u7528\u52a8\u6001\u6d3e\u53d1\u6765\u63d0\u9ad8\u4ee3\u7801\u6267\u884c\u6548\u7387\u3002<\/p>\n\n\n\n<p>\u5982\u679c\u6211\u4eec\u786e\u5b9a\u4f7f\u7528\u8fd9\u4e9b\u5185\u5bb9\u7684\u52a8\u6001\u7279\u6027\u7684\u8bdd\uff0c\u6211\u4eec\u9700\u8981\u624b\u52a8\u7ed9\u5b83\u4eec\u52a0\u4e0a@objc\u4fee\u9970.<br>\u4f46\u662f\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u6dfb\u52a0@objc\u4fee\u9970\u7b26\u5e76\u4e0d\u610f\u5473\u7740\u8fd9\u4e2a\u65b9\u6cd5\u6216\u8005\u5c5e\u6027\u4f1a\u53d8\u6210\u52a8\u6001\u6d3e\u53d1\uff0cSwift \u4f9d\u7136\u53ef\u80fd\u4f1a\u5c06\u5176\u4f18\u5316\u4e3a\u9759\u6001\u8c03\u7528\u3002<br>\u5982\u679c\u4f60\u9700\u8981\u548c Objective-C \u91cc\u52a8\u6001\u8c03\u7528\u65f6\u76f8\u540c\u7684\u8fd0\u884c\u65f6\u7279\u6027\u7684\u8bdd\uff0c\u4f60\u9700\u8981\u4f7f\u7528\u7684\u4fee\u9970\u7b26\u662fdynamic\u3002<\/p>\n\n\n\n<p>\u4e00\u822c\u60c5\u51b5\u4e0b\u5728\u505a app \u5f00\u53d1\u65f6\u5e94\u8be5\u7528\u4e0d\u4e0a\uff0c\u4f46\u662f\u5728\u65bd\u5c55\u4e00\u4e9b\u50cf\u52a8\u6001\u66ff\u6362\u65b9\u6cd5\u6216\u8005\u8fd0\u884c\u65f6\u518d\u51b3\u5b9a\u5b9e\u73b0\u8fd9\u6837\u7684 &#8220;\u9ed1\u9b54\u6cd5&#8221; \u7684\u65f6\u5019\uff0c\u6211\u4eec\u5c31\u9700\u8981\u7528\u5230dynamic\u4fee\u9970\u7b26\u4e86\u3002<br>\u5728<a rel=\"noreferrer noopener\" href=\"https:\/\/links.jianshu.com\/go?to=http%3A%2F%2Fswifter.tips%2Fkvo%2F\" target=\"_blank\">KVO<\/a>\u4e00\u8282\u4e2d\uff0c\u6211\u4eec\u63d0\u5230\u4e86\u4e00\u4e2a\u5173\u4e8e\u4f7f\u7528dynamic\u7684\u5b9e\u4f8b\u3002<br>\u5173\u4e8e Swift \u548c Objective-C \u6df7\u7528\u7684\u4e00\u4e2a\u597d\u6d88\u606f\u662f\uff0c\u968f\u7740 Swift \u7684\u53d1\u5c55\uff0cApple \u6b63\u5728\u52aa\u529b\u6539\u5584 SDK\u3002<br>\u5728 Objective-C \u4e2d\u6dfb\u52a0\u7684nonnull\u548cnullable\uff0c\u4ee5\u53ca\u6cdb\u578b\u7684\u6570\u7ec4\u548c\u5b57\u5178\u7b49\uff0c\u5176\u5b9e\u4e0a\u90fd\u662f\u4e3a\u4e86\u4f7f SDK \u66f4\u52a0\u9002\u5408\u7528 Swift \u6765\u4f7f\u7528\u6240\u505a\u7684\u52aa\u529b\uff0c\u6211\u4eec\u8fd8\u662f\u5f88\u6709\u5e0c\u671b\u5728\u4e0d\u4e45\u7684\u672a\u6765\u80fd\u591f\u6446\u8131\u6389\u8fd9\u4e9b\u59a5\u534f\u548c\u675f\u7f1a\u7684\u3002<\/p>\n\n\n\n<p><strong>@NSManaged\u7684\u5b9a\u4e49<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>Core Data \u63d0\u4f9b\u4e86\u57fa\u672c\u5b58\u50a8\u548c\u5b9e\u73b0NSManagedObject\u5b50\u7c7b\u7684\u4e00\u7ec4\u5c5e\u6027\u3002\u5728\u4e0eCore Data \u6a21\u578b\u4e2d\u7ba1\u7406\u5bf9\u8c61\u5b50\u7c7b\u76f8\u5173\u7684\u7279\u6027\u6216\u8005\u5173\u7cfb\u7684\u6bcf\u4e2a\u5c5e\u6027\u5b9a\u4e49\u4e4b\u524d\uff0c\u5c06@NSmanaged\u7279\u6027\u52a0\u5165\u3002\u4e0e Objective-C \u91cc\u9762\u7684 @dynamic\u7279\u6027\u7c7b\u4f3c\uff0c@NSManaged\u7279\u6027\u544a\u77e5 Swift \u7f16\u8bd1\u5668\uff0c\u8fd9\u4e2a\u5c5e\u6027\u7684\u5b58\u50a8\u548c\u5b9e\u73b0\u5c06\u5728\u8fd0\u884c\u65f6\u5b8c\u6210\u3002\u4f46\u662f\uff0c\u4e0e@dynamic\u4e0d\u540c\u7684\u662f\uff0c@NSManaged\u7279\u6027\u4ec5\u5728 Core Data \u652f\u6301\u4e2d\u53ef\u7528\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528@objc\u53ef\u4ee5\u4fee\u6539 Swift \u63a5\u53e3\u66b4\u9732\u5230 Objective-C \u540e\u7684\u540d\u5b57<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@objc(Squirrel)\nclass \u0411\u0435\u043b\u043a\u0430: NSObject {\n    @objc(color)\n    var \u0446\u0432\u0435\u0442: \u0426\u0432\u0435\u0442 = .\u041a\u0440\u0430\u0441\u043d\u044b\u0439\n \n    @objc(hideNuts:inTree:)\n    func \u043f\u0440\u044f\u0447\u044c\u041e\u0440\u0435\u0445\u0438(\u043a\u043e\u043b\u0438\u0447\u0435\u0441\u0442\u0432\u043e: Int, \u0432\u0414\u0435\u0440\u0435\u0432\u0435 \u0434\u0435\u0440\u0435\u0432\u043e: \u0414\u0435\u0440\u0435\u0432\u043e) { }\n}<\/pre>\n\n\n\n<p><strong>@objcMembers<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u4f7f\u7528@objcMembers\u5173\u952e\u5b57\uff0c\u5c06\u7c7b\u4e2d\u7684\u6240\u6709\u65b9\u6cd5\u66b4\u9732\u7ed9Objc (\u6548\u679c\u7b49\u540c\u4e8e\u4e3a\u6240\u6709\u65b9\u6cd5\u52a0\u4e0a@objc)\u3002<\/p>\n\n\n\n<p>\u4e3a\u4ec0\u4e48\u8981\u7528\u8fd9\u4e2a\u5173\u952e\u5b57\u5462\uff1f<\/p>\n\n\n\n<p>@objcMembers \u5728Swift 4\u4e2d\u7ee7\u627f NSObject \u7684 swift class \u4e0d\u518d\u9ed8\u8ba4\u5168\u90e8 bridge \u5230 OC\uff0c\u5982\u679c\u6211\u4eec\u60f3\u8981\u4f7f\u7528\u7684\u8bdd\u6211\u4eec\u5c31\u9700\u8981\u5728class\u524d\u9762\u52a0\u4e0a@objcMembers \u8fd9\u4e48\u4e00\u4e2a\u5173\u952e\u5b57\u3002<br>\u5f15\u7528: \u5728 swift 3 \u4e2d\u9664\u4e86\u624b\u52a8\u6dfb\u52a0 @objc \u58f0\u660e\u51fd\u6570\u652f\u6301 OC \u8c03\u7528\u8fd8\u6709\u53e6\u5916\u4e00\u79cd\u65b9\u5f0f\uff1a\u7ee7\u627f NSObject\u3002<br>class \u7ee7\u627f\u4e86 NSObject \u540e\uff0c\u7f16\u8bd1\u5668\u5c31\u4f1a\u9ed8\u8ba4\u7ed9\u8fd9\u4e2a\u7c7b\u4e2d\u7684\u6240\u6709\u51fd\u6570\u90fd\u6807\u8bb0\u4e3a @objc \uff0c\u652f\u6301 OC \u8c03\u7528\u3002<br>\u82f9\u679c\u5728Swift 4 \u4e2d\u82f9\u679c\u4fee\u6539\u4e86\u81ea\u52a8\u6dfb\u52a0 @objc \u7684\u903b\u8f91\uff1a \u4e00\u4e2a\u7ee7\u627f NSObject \u7684 swift \u7c7b\u4e0d\u518d\u9ed8\u8ba4\u7ed9\u6240\u6709\u51fd\u6570\u6dfb\u52a0 @objc\u3002<br>\u53ea\u5728\u5b9e\u73b0 OC \u63a5\u53e3\u548c\u91cd\u5199 OC \u65b9\u6cd5\u65f6\u624d\u81ea\u52a8\u7ed9\u51fd\u6570\u6dfb\u52a0 @objc \u6807\u8bc6\u3002<br>Swift4 \u540e\u7ee7\u627f\u81eaNSObject\u7684\u7c7b\u4e0d\u518d\u9690\u5f0f\u6dfb\u52a0@objc\u5173\u952e\u5b57\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u975e\u5e38\u4f9d\u8d56 Objective-C \u7684\u8fd0\u884c\u65f6\uff08\u5982 XCTest\uff09\uff0c\u6240\u4ee5\u5728 Swift4 \u4e2d\u63d0\u4f9b\u4e86@objcMembers\u5173\u952e\u5b57\uff0c\u5bf9\u7c7b\u548c\u5b50\u7c7b\u3001\u6269\u5c55\u548c\u5b50\u7c7b\u6269\u5c55\u91cd\u65b0\u542f\u7528@objc\u63a8\u65ad\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@objcMembers\nclass MyClass : NSObject {\n  func foo() { }             \/\/ implicitly @objc\n \n  func bar() -> (Int, Int)   \/\/ not @objc, because tuple returns\n      \/\/ aren't representable in Objective-C\n}\n \nextension MyClass {\n  func baz() { }   \/\/ implicitly @objc\n}\n \nclass MySubClass : MyClass {\n  func wibble() { }   \/\/ implicitly @objc\n}\n \nextension MySubClass {\n  func wobble() { }   \/\/ implicitly @objc\n}\n<\/pre>\n\n\n\n<p>\u4f7f\u7528@objc\u548c@nonobjc\u53ef\u4ee5\u6307\u5b9a\u5f00\u542f\u6216\u5173\u95ed\u67d0\u4e00extension\u4e2d\u7684\u6240\u6709\u65b9\u6cd5\u7684@objc\u63a8\u65ad\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class SwiftClass { }\n \n@objc extension SwiftClass {\n  func foo() { }            \/\/ implicitly @objc\n  func bar() -> (Int, Int)  \/\/ error: tuple type (Int, Int) not\n      \/\/ expressible in @objc. add @nonobjc or move this method to fix the issue\n}\n \n@objcMembers\nclass MyClass : NSObject {\n  func wibble() { }    \/\/ implicitly @objc\n}\n \n@nonobjc extension MyClass {\n  func wobble() { }    \/\/ not @objc, despite @objcMembers\n}\n<\/pre>\n\n\n\n<p><strong>Dynamic<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5982\u679c\u60a8\u6709\u8fc7OC\u7684\u5f00\u53d1\u7ecf\u9a8c\uff0c\u90a3\u4e00\u5b9a\u4f1a\u5bf9OC\u4e2d@dynamic\u5173\u952e\u5b57\u6bd4\u8f83\u719f\u6089\uff0c\u5b83\u544a\u8bc9\u7f16\u8bd1\u5668\u4e0d\u8981\u4e3a\u5c5e\u6027\u5408\u6210getter\u548csetter\u65b9\u6cd5\u3002<\/p>\n\n\n\n<p>Swift\u4e2d\u4e5f\u6709dynamic\u5173\u952e\u5b57\uff0c\u5b83\u53ef\u4ee5\u7528\u4e8e\u4fee\u9970\u53d8\u91cf\u6216\u51fd\u6570\uff0c\u5b83\u7684\u610f\u601d\u4e5f\u4e0eOC\u5b8c\u5168\u4e0d\u540c\u3002\u5b83\u544a\u8bc9\u7f16\u8bd1\u5668\u4f7f\u7528\u52a8\u6001\u5206\u53d1\u800c\u4e0d\u662f\u9759\u6001\u5206\u53d1\u3002OC\u533a\u522b\u4e8e\u5176\u4ed6\u8bed\u8a00\u7684\u4e00\u4e2a\u7279\u70b9\u5728\u4e8e\u5b83\u7684\u52a8\u6001\u6027\uff0c\u4efb\u4f55\u65b9\u6cd5\u8c03\u7528\u5b9e\u9645\u4e0a\u90fd\u662f\u6d88\u606f\u5206\u53d1\uff0c\u800cSwift\u5219\u5c3d\u53ef\u80fd\u505a\u5230\u9759\u6001\u5206\u53d1\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u6807\u8bb0\u4e3adynamic\u7684\u53d8\u91cf\/\u51fd\u6570\u4f1a\u9690\u5f0f\u7684\u52a0\u4e0a@objc\u5173\u952e\u5b57\uff0c\u5b83\u4f1a\u4f7f\u7528OC\u7684runtime\u673a\u5236\u3002<\/p>\n\n\n\n<p>\u867d\u7136\u9759\u6001\u5206\u53d1\u5728\u6548\u7387\u4e0a\u53ef\u80fd\u66f4\u597d\uff0c\u4e0d\u8fc7\u4e00\u4e9bapp\u5206\u6790\u7edf\u8ba1\u7684\u5e93\u9700\u8981\u4f9d\u8d56\u52a8\u6001\u5206\u53d1\u7684\u7279\u6027\uff0c\u52a8\u6001\u7684\u6dfb\u52a0\u4e00\u4e9b\u7edf\u8ba1\u4ee3\u7801\uff0c\u8fd9\u4e00\u70b9\u5728Swift\u7684\u9759\u6001\u5206\u53d1\u673a\u5236\u4e0b\u5f88\u96be\u5b8c\u6210\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u867d\u7136\u4f7f\u7528dynamic\u5173\u952e\u5b57\u4f1a\u727a\u7272\u56e0\u4e3a\u4f7f\u7528\u9759\u6001\u5206\u53d1\u800c\u83b7\u5f97\u7684\u4e00\u4e9b\u6027\u80fd\u4f18\u5316\uff0c\u4f46\u4e5f\u4f9d\u7136\u662f\u503c\u5f97\u7684\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class Kraken {\n    dynamic var imADynamicallyDispatchedString: String\n \n    dynamic func imADynamicallyDispatchedFunction() {\n        \/\/Hooray for dynamic dispatch!\n    }\n}<\/pre>\n\n\n\n<p>\u4f7f\u7528\u52a8\u6001\u5206\u53d1\uff0c\u60a8\u53ef\u4ee5\u66f4\u597d\u7684\u4e0eOC\u4e2druntime\u7684\u4e00\u4e9b\u7279\u6027\uff08\u5982CoreData\uff0cKVC\/KVO\uff09\u8fdb\u884c\u4ea4\u4e92\uff0c\u4e0d\u8fc7\u5982\u679c\u60a8\u4e0d\u80fd\u786e\u5b9a\u53d8\u91cf\u6216\u51fd\u6570\u4f1a\u88ab\u52a8\u6001\u7684\u4fee\u6539\u3001\u6dfb\u52a0\u6216\u4f7f\u7528\u4e86Method-Swizzle\uff0c\u90a3\u4e48\u5c31\u4e0d\u5e94\u8be5\u4f7f\u7528dynamic\u5173\u952e\u5b57\uff0c\u5426\u5219\u6709\u53ef\u80fd\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n\n\n\n<p>Swift\u4e2d\u4e5f\u6709dynamic\u5173\u952e\u5b57\uff0c\u5b83\u53ef\u4ee5\u7528\u4e8e\u4fee\u9970\u53d8\u91cf\u6216\u51fd\u6570\uff0c\u5b83\u7684\u610f\u601d\u4e5f\u4e0eOC\u5b8c\u5168\u4e0d\u540c\u3002\u5b83\u544a\u8bc9\u7f16\u8bd1\u5668\u4f7f\u7528\u52a8\u6001\u5206\u53d1\u800c\u4e0d\u662f\u9759\u6001\u5206\u53d1\u3002OC\u533a\u522b\u4e8e\u5176\u4ed6\u8bed\u8a00\u7684\u4e00\u4e2a\u7279\u70b9\u5728\u4e8e\u5b83\u7684\u52a8\u6001\u6027\uff0c\u4efb\u4f55\u65b9\u6cd5\u8c03\u7528\u5b9e\u9645\u4e0a\u90fd\u662f\u6d88\u606f\u5206\u53d1\uff0c\u800cSwift\u5219\u5c3d\u53ef\u80fd\u505a\u5230\u9759\u6001\u5206\u53d1\u3002<\/p>\n\n\n\n<p>\u56e0\u6b64\uff0c\u6807\u8bb0\u4e3adynamic\u7684\u53d8\u91cf\/\u51fd\u6570\u4f1a\u9690\u5f0f\u7684\u52a0\u4e0a@objc\u5173\u952e\u5b57\uff0c\u5b83\u4f1a\u4f7f\u7528OC\u7684runtime\u673a\u5236\u3002<\/p>\n\n\n\n<p>\u867d\u7136\u9759\u6001\u5206\u53d1\u5728\u6548\u7387\u4e0a\u53ef\u80fd\u66f4\u597d\uff0c\u4e0d\u8fc7\u4e00\u4e9bapp\u5206\u6790\u7edf\u8ba1\u7684\u5e93\u9700\u8981\u4f9d\u8d56\u52a8\u6001\u5206\u53d1\u7684\u7279\u6027\uff0c\u52a8\u6001\u7684\u6dfb\u52a0\u4e00\u4e9b\u7edf\u8ba1\u4ee3\u7801\uff0c\u8fd9\u4e00\u70b9\u5728Swift\u7684\u9759\u6001\u5206\u53d1\u673a\u5236\u4e0b\u5f88\u96be\u5b8c\u6210\u3002\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u867d\u7136\u4f7f\u7528dynamic\u5173\u952e\u5b57\u4f1a\u727a\u7272\u56e0\u4e3a\u4f7f\u7528\u9759\u6001\u5206\u53d1\u800c\u83b7\u5f97\u7684\u4e00\u4e9b\u6027\u80fd\u4f18\u5316\uff0c\u4f46\u4e5f\u4f9d\u7136\u662f\u503c\u5f97\u7684\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528\u52a8\u6001\u5206\u53d1\uff0c\u60a8\u53ef\u4ee5\u66f4\u597d\u7684\u4e0eOC\u4e2druntime\u7684\u4e00\u4e9b\u7279\u6027\uff08\u5982CoreData\uff0cKVC\/KVO\uff09\u8fdb\u884c\u4ea4\u4e92\uff0c\u4e0d\u8fc7\u5982\u679c\u60a8\u4e0d\u80fd\u786e\u5b9a\u53d8\u91cf\u6216\u51fd\u6570\u4f1a\u88ab\u52a8\u6001\u7684\u4fee\u6539\u3001\u6dfb\u52a0\u6216\u4f7f\u7528\u4e86Method-Swizzle\uff0c\u90a3\u4e48\u5c31\u4e0d\u5e94\u8be5\u4f7f\u7528dynamic\u5173\u952e\u5b57\uff0c\u5426\u5219\u6709\u53ef\u80fd\u7a0b\u5e8f\u5d29\u6e83\u3002<\/p>\n\n\n\n<p><strong>\u8865\u5145\u7684\u4e00\u4e9b\u4f8b\u5b50<\/strong><\/p>\n\n\n\n<hr class=\"wp-block-separator\"\/>\n\n\n\n<p>\u5728 Swift \u4e2d\u5f88\u591a\u5730\u65b9\u90fd\u662f\u7528\u5230\u4e86\u4e00\u4e2a\u4fee\u9970\u7b26<code>@objc<\/code>\uff0c\u5c24\u5176\u662f\u5728\u6df7\u7f16\u9879\u76ee\u4e2d\uff0c\u51fa\u4e8e\u5b89\u5168\u7684\u8003\u8651\uff0c\u53ef\u4ee5\u5c06\u9700\u8981\u66b4\u9732\u7ed9 Objective-C \u4f7f\u7528\u7684\u5982\u7c7b\uff0c\u5c5e\u6027\u548c\u65b9\u6cd5\u7684\u58f0\u660e\u524d\u9762\u52a0\u4e0a <code>@objc<\/code>\u3002\u90a3\u4e48\u5728 Swift \u4e2d\u54ea\u4e9b\u5730\u65b9\u7528\u5230\u4e86\u8fd9\u4e2a\u5173\u952e\u5b57\u5462\uff1f<\/p>\n\n\n\n<ul><li><code>Selector<\/code> \u4e2d\u8c03\u7528\u7684\u65b9\u6cd5\u9700\u8981\u5728\u65b9\u6cd5\u524d\u58f0\u660e <code>@objc<\/code>\uff0c\u76ee\u7684\u662f\u5141\u8bb8\u8fd9\u4e2a\u51fd\u6570\u5728\u201c\u8fd0\u884c\u65f6\u201d\u901a\u8fc7 Objective-C \u7684\u6d88\u606f\u673a\u5236\u8c03\u7528<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">override func viewDidLoad() {\n    super.viewDidLoad()\n    let btn = UIButton(type: .contactAdd)     \n    btn.addTarget(self, action: #selector(click), for: .touchUpInside)\n}\n@objc func click()  {      \n    print(\"Button clicked\")\n}<\/pre>\n\n\n\n<ul><li>\u534f\u8bae\u7684\u65b9\u6cd5\u53ef\u9009\u65f6\uff0c\u534f\u8bae\u548c\u53ef\u9009\u65b9\u6cd5\u524d\u8981\u7528 <code>@objc<\/code>\u58f0\u660e<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@objc protocol OptionalProtocol {\n    @objc optional func optionalMethold1()\n    @objc optional func optionalMethold2()\n}<\/pre>\n\n\n\n<ul><li>\u7528weak\u4fee\u9970\u534f\u8bae\u65f6\uff0c\u534f\u8bae\u524d\u9762\u8981\u7528<code>@objc<\/code>\u58f0\u660e<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@objc protocol MyDelegate{   \n    func methold1()  \n}\n\nclass MyClass{\n    weak var delegate: MyDelegate?  \n}<\/pre>\n\n\n\n<ul><li>\u7c7b\u524d\u52a0\u4e0a <code>@objcMembers<\/code>\uff0c\u90a3\u4e48\u5b83\u53ca\u5176\u5b50\u7c7b\u3001\u6269\u5c55\u91cc\u7684\u65b9\u6cd5\u90fd\u4f1a\u9690\u5f0f\u7684\u52a0\u4e0a <code>@objc<\/code><\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@objcMembers\nclass Person {\n\n}<\/pre>\n\n\n\n<ul><li>\u5982\u679c\u6b64\u65f6\u5728\u6269\u5c55\u91cc\u9762\u4e0d\u60f3\u52a0<code>@objc<\/code>\uff0c\u53ef\u4ee5\u7528<code>@nonobjc<\/code>\u4fee\u9970<\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">@objcMembers\nclass Person {  \n    func work(){}\n}\n\n@nonobjc extension Person{\n    func eat() { } \/\/\u5305\u542b\u9690\u5f0f\u7684 @objc\n    func sleep() { } \/\/\u5305\u542b\u9690\u5f0f\u7684 @objc\n}<\/pre>\n\n\n\n<ul><li>\u6269\u5c55\u524d\u52a0\u4e0a <code>@objc<\/code>\uff0c\u90a3\u4e48\u91cc\u9762\u7684\u65b9\u6cd5\u90fd\u4f1a\u9690\u5f0f\u52a0\u4e0a <code>@objc<\/code><\/li><\/ul>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">class Person {  \n    func work(){}\n}\n@objc extension Person{\n    func eat() { } \/\/\u5305\u542b\u9690\u5f0f\u7684 @objc\n    func sleep() { } \/\/\u5305\u542b\u9690\u5f0f\u7684 @objc\n}<\/pre>\n","protected":false},"excerpt":{"rendered":"<p>@Objc Objective-C \u548c Swift \u5728\u5e95\u5c42\u4f7f\u7528\u7684\u662f\u4e24\u5957\u5b8c\u5168\u4e0d\u540c\u7684\u673a\u5236\uff0cCocoa \u4e2d\u7684 Obj [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6,8],"tags":[],"_links":{"self":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/7254"}],"collection":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=7254"}],"version-history":[{"count":6,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/7254\/revisions"}],"predecessor-version":[{"id":7294,"href":"https:\/\/92it.top\/index.php?rest_route=\/wp\/v2\/posts\/7254\/revisions\/7294"}],"wp:attachment":[{"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=7254"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=7254"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/92it.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=7254"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}