WebView loadRequest请求错误"NSURLConnection finished with error - code -1022"

执行下面代码

[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"http://www.bing.com"]]];

webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error打印出来的的错误如下

 [:] NSURLConnection finished with error - code -
 [:] Error Domain=NSURLErrorDomain Code=- "The resource could not be loaded because the App Transport Security policy
 requires the use of a secure connection." UserInfo={NSUnderlyingError=0x600000641f50
 {Error Domain=kCFErrorDomainCFNetwork Code=- "The resource could not be loaded because the App Transport Security policy requires
 the use of a secure connection." UserInfo={NSErrorFailingURLStringKey=http://www.bing.com/,
 NSLocalizedDescription=The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.,
  NSErrorFailingURLKey=http://www.bing.com/}}, NSErrorFailingURLStringKey=http://www.bing.com/, NSErrorFailingURLKey=http://www.bing.com/,
 NSLocalizedDescription=The resource could not be loaded because the App Transport Security policy requires the use of a secure connection.}

解决方案很简单:

URLString必须使用https的请求webview就能正常显示了

但后来发现要加载http://localhost:8080然后悲剧了,看来还是要研究一下具体机制了,在XCode 9就会出现错误中提示了很明显的信息

The resource could not be loaded because the App Transport Security policy 

去百度一下ATS policy,就可以知道很详细的答案了,在SupportFiles->info.plist文件里面添加下面属性就好了,有直接的选项,不需要自己填写

done!