{"id":753,"date":"2016-08-16T12:23:30","date_gmt":"2016-08-16T04:23:30","guid":{"rendered":"http:\/\/www.yusian.com\/blog\/?p=753"},"modified":"2016-08-16T13:50:42","modified_gmt":"2016-08-16T05:50:42","slug":"oc%e4%b8%8ejavascript%e4%ba%a4%e4%ba%92%e5%88%b7%e6%96%b0%e9%a1%b5%e9%9d%a2%e5%a4%b1%e6%95%88%e7%9a%84%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.yusian.com\/blog\/analysis\/2016\/08\/16\/122330753.html","title":{"rendered":"OC\u4e0eJavaScript\u4ea4\u4e92\u5237\u65b0\u9875\u9762\u5931\u6548\u7684\u95ee\u9898"},"content":{"rendered":"<p>1\u3001\u5148\u53c2\u8003 <a href=\"http:\/\/www.yusian.com\/blog\/project\/2016\/03\/17\/170631.html\" target=\"_blank\">Objective-C\u4e0eJavaScript\u4ea4\u4e92\u7684\u4e24\u79cd\u65b9\u5f0f<\/a><\/p>\n<p>2\u3001\u8fd9\u91cc\u9762\u63d0\u5230\u7684\u4e00\u4e2a\u5173\u952e\u6027\u95ee\u9898\uff1a\u5f53JS\u6ce8\u5165\u5230UIWebView\u7684JSContext\u4e2d\u540e\uff0c\u5f53\u524d\u9875\u9762\u8df3\u8f6c\u5230\u4e86\u4e00\u4e2a\u65b0\u9875\u9762\u540e\uff0cJS\u6ce8\u5165\u5c31\u5931\u6548\u4e86\uff1b<\/p>\n<p>3\u3001\u524d\u9762\u63d0\u5230\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5728UIWebView\u7684\u4ee3\u7406\u65b9\u6cd5\u4e2d\u91cd\u65b0\u6ce8\u5165\uff0c\u5982webViewDidStartLoad\u6216webViewDidFinishLoad\u65b9\u6cd5\uff1b<\/p>\n<p>4\u3001\u4f46\u6709\u4e00\u4e2a\u95ee\u9898\uff0c\u5982\u679c\u5728webViewDidFinishLoad\u65b9\u6cd5\u4e2d\u624d\u6ce8\u5165\uff0c\u5982\u679c\u9875\u9762\u52a0\u8f7d\u8fc7\u7a0b\u4e2d\u6709JS\u9700\u8981\u8c03\u7528\u539f\u751f\u65b9\u6cd5\u600e\u4e48\u529e\uff1f\u5c31\u4f1a\u9020\u6210\u8c03\u7528\u5931\u8d25\uff0c\u53e6\u5916\u5982\u679c\u5728webViewDidStartLoad\u65b9\u6cd5\u4e2d\u5c31\u8c03\u7528\uff0c\u6709\u53ef\u80fd\u5f53\u524d\u9875\u9762\u8fd8\u6ca1\u8df3\u8f6c\u5230\u4e0b\u4e00\u4e2a\u9875\u9762\uff08\u6bd5\u7adf\u9875\u9762\u8df3\u8f6c\u662f\u9700\u8981\u65f6\u95f4\u7684\uff09\uff0c\u9020\u6210JS\u6ce8\u5165\u5728\u5f53\u524d\u9875\u9762\uff0c\u65b0\u8df3\u8f6c\u7684\u9875\u9762\u8fd8\u662f\u6ca1\u6709\u88ab\u6ce8\u5165\uff0c\u8fd9\u6837\u4e00\u6765\u600e\u4e48\u5199\u90fd\u4e0d\u592a\u59a5\u5f53\uff0c\u5e76\u4e14UIWebView\u4e5f\u5c31\u90a3\u4e48\u51e0\u4e2a\u4ee3\u7406\u65b9\u6cd5\uff0c\u5982\u4f55\u7834\uff1f\uff01<!--more--><\/p>\n<p>5\u3001\u9996\u5148\u5bf9JSContext\u8fd9\u4e2a\u4e1c\u897f\u505a\u4e00\u4e2a\u8bf4\u660e\uff0cJSContext\u662f\u6bcf\u4e00\u4e2a\u9875\u9762\u7684JavaScript\u8fd0\u884c\u73af\u5883\uff0c\u8fd9\u4e2a\u73af\u5883\u662f\u9488\u5bf9\u5f53\u4e2a\u9875\u9762\u6709\u6548\u5e76\u4e14\u72ec\u7acb\u5b58\u5728\u7684\uff0c\u5e76\u4e0d\u662f\u4e00\u4e2aUIWebView\u5171\u7528\u4e00\u4e2aJSContext\uff0c\u800c\u662f\u6bcf\u4e2a\u9875\u9762\uff08\u4e3a\u4e86\u5e2e\u52a9\u7406\u89e3\u6216\u8005\u8bf4\u6bcf\u4e2aurl\u4e0d\u77e5\u9053\u662f\u5426\u5408\u9002\uff09\u90fd\u62e5\u6709\u4e00\u4e2a\u5355\u72ec\u7684JSContext\uff0c\u524d\u9762\u6211\u4eec\u90fd\u662f\u901a\u8fc7KVC\u7684\u6a21\u5f0f\u901a\u8fc7\u952edocumentView.webView.mainFrame.javaScriptContext\u6765\u83b7\u53d6\uff0c\u8fd9\u79cd\u65b9\u5f0f\u672c\u8eab\u95ee\u9898\u4e0d\u5927(\u4e0d\u6392\u9664\u4e0a\u82f9\u679c\u5546\u5e97\u5ba1\u6838\u4e0d\u901a\u8fc7\u7684\u53ef\u80fd\u6027)\uff0c\u5173\u952e\u95ee\u9898\u5728\u4e8e\u4f55\u65f6\u8c03\u7528\uff1f<\/p>\n<p>6\u3001\u6839\u636e\u4ee3\u7406\u8bbe\u8ba1\u6a21\u5f0f\u7684\u601d\u8def\u53bb\u60f3\uff0c\u6700\u597d\u7684\u529e\u6cd5\u5c31\u662f\u5728UIWebView\u521b\u5efa\u4e86\u4e00\u4e2a\u65b0\u7684JSContext\u65f6\u901a\u8fc7\u4ee3\u7406\u65b9\u6cd5\u8c03\u7528\u6ce8\u5165\u65b9\u6cd5\uff0c\u8fd9\u6837\u6700\u9760\u8c31\uff01\u90a3\u73b0\u5728\u6700\u91cd\u8981\u7684\u5c31\u662f\u8fd9\u4e2a\u4ee3\u7406\u65b9\u6cd5\u6709\u5417\uff1f\u600e\u4e48\u53bb\u627e\u5230\u8fd9\u4e2a\u70b9\uff1fUIWebView\u662f\u6ca1\u6709\u7684\uff0c\u5e76\u4e14UIWebView\u7684\u7236\u7c7b\u662fUIView\u4e5f\u662f\u6ca1\u4ec0\u4e48\u5e0c\u671b\u7684\u3002<\/p>\n<p>7\u3001\u5728OS X\u4e2d\u53d1\u73b0\uff0cWebFrameLoadDelegate\u8d1f\u8d23WebKit\u4e0eNSWebView\u7684\u901a\u4fe1\uff0c\u7531\u4e8eNSWebView\u5185\u90e8\u4ecd\u7136\u4f7f\u7528WebKit\u6e32\u67d3\u5f15\u64ce\uff0c\u82e5\u8981\u4fa6\u542c\u6e32\u67d3\u8fc7\u7a0b\u4e2d\u7684\u4e00\u7cfb\u5217\u4e8b\u4ef6\uff0c\u5219\u5fc5\u987b\u4f7f\u7528WebFrameLoadDelegate\u5bf9\u8c61\uff1a<\/p>\n<pre line=\"1\">1\u3001\u52a0\u8f7d\u8fc7\u7a0b\uff1a\n\n\u5728\u4e00\u4e2a\u8bbf\u95ee\u4e00\u4e2a\u7f51\u9875\u7684\u7684\u6574\u4e2a\u8fc7\u7a0b\uff0c\u5305\u62ec\u5f00\u59cb\u52a0\u8f7d\uff0c\u52a0\u8f7d\u6807\u9898\uff0c\u52a0\u8f7d\u7ed3\u675f\u7b49\u3002webkit\u90fd\u4f1a\u53d1\u9001\u76f8\u5e94\u7684\u6d88\u606fWebFrameLoadDelegate\n\nwebView:didStartProvisionalLoadForFrame:\u5f00\u59cb\u52a0\u8f7d\uff0c\u5728\u8fd9\u91cc\u83b7\u53d6\u52a0\u8f7d\u7684url\n\nwebView:didReceiveTitle:forFrame:\u83b7\u53d6\u5230\u7f51\u9875\u6807\u9898\n\nwebView:didFinishLoadForFrame:\u9875\u9762\u52a0\u8f7d\u5b8c\u6210<\/pre>\n<pre line=\"1\">2\u3001\u9519\u8bef\u7684\u5904\u7406\uff1a\n\n\u52a0\u8f7d\u7684\u8fc7\u7a0b\u5f53\u4e2d\uff0c\u6709\u53ef\u80fd\u4f1a\u53d1\u751f\u9519\u8bef\u3002\u9519\u8bef\u7684\u6d88\u606f\u4e5f\u4f1a\u53d1\u9001\u7ed9WebFrameLoadDelegate \u3002\u6211\u4eec\u53ef\u4ee5\u5728\u8fd9\u4e24\u4e2a\u51fd\u6570\u91cc\u9762\u5bf9\u9519\u8bef\u4fe1\u606f\u8fdb\u884c\u5904\u7406\n\nwebView:didFailProvisionalLoadWithError:forFrame: \u8fd9\u4e2a\u9519\u8bef\u53d1\u751f\u5728\u8bf7\u6c42\u6570\u636e\u4e4b\u524d\uff0c\u6700\u5e38\u89c1\u662f\u53d1\u751f\u5728\u65e0\u6548\u7684URL\u6216\u8005\u7f51\u7edc\u65ad\u5f00\u65e0\u6cd5\u53d1\u9001\u8bf7\u6c42\n\nwebView:didFailLoadWithError:forFrame: 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(implementations->didCreateJavaScriptContextForFrameFunc) {\n    CallFrameLoadDelegate(implementations->didCreateJavaScriptContextForFrameFunc, webView, @selector(webView:didCreateJavaScriptContext:forFrame:),\n        script.javaScriptContext(), m_webFrame.get());\n}<\/pre>\n<p>\u5224\u65ad\u5f53\u524d\u7684\u5bf9\u8c61\u6709\u6ca1\u6709\u5b9e\u73b0webView:didCreateJavaScriptContext:forFrame:\u65b9\u6cd5\uff0c\u6709\u5219\u6267\u884c\u3002\u8be5\u65b9\u6cd5\u4f1a\u4f20\u9012\u4e09\u4e2a\u53c2\u6570\uff0c\u7b2c\u4e00\u4e2a\u662f\u4e0ewebkit\u901a\u4fe1\u7684WebView\uff08\u6b64WebView\u5e76\u4e0d\u662fUIWebVIew\uff0cNick\u5c42\u505a\u8fc7\u6d4b\u8bd5\u901a\u8fc7\u83b7\u53d6\u7684WebView\u5e76\u4e0d\u80fd\u904d\u5386\u5230\u6211\u4eec\u9700\u8981\u7684UIWebVIew\uff0c\u56e0\u6b64\u63a8\u6d4b\uff0c\u8fd9\u4e2aWebView\u662f\u4e00\u4e2aUIView\u7684proxy\u5bf9\u8c61\uff0c\u4e0d\u662fUIView\u7c7b\uff09\uff1b\u7b2c\u4e8c\u4e2a\u5219\u662f\u6211\u4eec\u60f3\u8981\u83b7\u53d6\u7684JSContext\uff1b\u7b2c\u4e09\u4e2a\u53c2\u6570\u662fwebkit\u6846\u67b6\u4e2d\u7684WebFrame\u5bf9\u8c61\uff0c\u4e0e\u6211\u4eec\u7684\u671f\u671b\u65e0\u5173\u3002<\/p>\n<p>10\u3001\u4e3a\u4e86\u8ba9webkit\u6267\u884c\u8fd9\u4e2a\u51fd\u6570\uff0c\u6211\u4eec\u5fc5\u987b\u8ba9\u5bf9\u8c61\u5b9e\u73b0\u8fd9\u4e2a\u65b9\u6cd5\u3002\u7531\u4e8e\u6240\u6709\u7684OC\u5bf9\u8c61\u90fd\u7ee7\u627f\u81eaNSObject\u5bf9\u8c61\uff0c\u56e0\u6b64\u6211\u4eec\u53ef\u4ee5\u5728NSObject\u5bf9\u8c61\u4e0a\u5b9e\u73b0\u8be5\u65b9\u6cd5\uff0c\u8fd9\u6837\u53ef\u4ee5\u4fdd\u8bc1\u8be5\u6bb5\u4ee3\u7801\u53ef\u4ee5\u5728webkit\u6846\u67b6\u4e2d\u6267\u884c\u3002<\/p>\n<p>11\u3001\u5199\u4e00\u4e2aNSObject\u7684Catagory\uff0c\u5e76\u5b9e\u73b0\u8be5\u65b9\u6cd5\uff0c\u901a\u8fc7\u901a\u77e5\u7684\u65b9\u5f0f\u5c06\u5bf9\u8c61\u4f20\u64ad\u51fa\u53bb\u5982\uff1a<\/p>\n<pre lang=\"objc\" line=\"1\">- (void)webView:(id)webView didCreateJavaScriptContext:(id)ctx forFrame:(id)frame\n{\n    [[NSNotificationCenter defaultCenter] postNotificationName:@\"SAWebViewDidCreateJavaScriptContext\" object:ctx];\n}<\/pre>\n<p>12\u3001\u53c2\u8003\u94fe\u63a5\uff1a<a href=\"https:\/\/segmentfault.com\/a\/1190000004285316\" target=\"_blank\">https:\/\/segmentfault.com\/a\/1190000004285316<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>1\u3001\u5148\u53c2\u8003 Objective-C\u4e0eJavaScript\u4ea4\u4e92\u7684\u4e24\u79cd\u65b9\u5f0f 2\u3001\u8fd9\u91cc\u9762\u63d0\u5230\u7684\u4e00\u4e2a\u5173\u952e\u6027\u95ee\u9898\uff1a\u5f53JS\u6ce8\u5165\u5230UIWebView\u7684JSContext\u4e2d\u540e\uff0c\u5f53\u524d\u9875\u9762\u8df3\u8f6c\u5230\u4e86\u4e00\u4e2a\u65b0\u9875\u9762\u540e\uff0cJS\u6ce8\u5165\u5c31\u5931\u6548\u4e86\uff1b 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