ATS设置
按照惯例写一个UIWebView，用来加载网页：
_webView=[[UIWebView alloc]initWithFrame:CGRectMake(0,0,self.view.frame.size.width,self.view.frame.size.height)];_webView.delegate=self;[self.view addSubview:_webView];NSURL*url=[NSURL URLWithString:@"https://github.com/"];_request=[NSURLRequest requestWithURL:url];[_webView loadRequest:_request];
run一下看看加载出来了吗？如果发现屏幕一片白并没有出现网页内容，不要惊讶，看看你的控制台是不是报出以下错误：
NSURLSession/NSURLConnection HTTP load failed(kCFStreamErrorDomainSSL,-9802)
这个怎么解决呢？没错ATS设置：去plist文件里添加一项App Transport Security Settings，它是个字典类型，给它增加一对键值，键：Allow Arbitrary Loads ，值设为YES。
以上，搞定ATS设置，网页成功加载了：
Simulator Screen Shot.png
如果你的网页是self signed website，那么你的屏幕应该还是一片白，并且控制台又报错：
NSURLSession/NSURLConnection HTTP load failed(kCFStreamErrorDomainSSL,-9813)
注意：这两次错误并不是一样的,后面数字代码不同
（并不太清楚这个码代表的意思，有知道的朋友请留言告知，感谢。）
NSURLConnection
使用webview加载自签名https站点的时候，必须在请求的时候将该站点设置为安全的，才能继续访问。所以我们需要在webview开始加载网页的时候首先判断判断该站点是不是https站点，如果是的话，先让他暂停加载，用NSURLConnection 来访问改站点，然后再身份验证的时候，将该站点置为可信任站点。然后在用webview重新加载请求。
直接上代码：
#pragmamark - UIWebViewDelegate// Note: This method is particularly important. As the server is using a self signed certificate,// we cannot use just UIWebView - as it doesn't allow for using self-certs. Instead, we stop the// request in this method below, create an NSURLConnection (which can allow self-certs via the delegate methods// which UIWebView does not have), authenticate using NSURLConnection, then use another UIWebView to complete// the loading and viewing of the page. See connection:didReceiveAuthenticationChallenge to see how this works.-(BOOL)webView:(UIWebView*)webView shouldStartLoadWithRequest:(NSURLRequest*)request navigationType:(UIWebViewNavigationType)navigationType;{NSLog(@"Did start loading: %@ auth:%d",[[request URL]absoluteString],_authenticated);if(!_authenticated){_authenticated=NO;_urlConnection=[[NSURLConnection alloc]initWithRequest:_request delegate:self];[_urlConnection start];returnNO;}returnYES;}#pragmamark - NURLConnection delegate-(void)connection:(NSURLConnection*)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge*)challenge;{NSLog(@"WebController Got auth challange via NSURLConnection");if([challenge previousFailureCount]==0){_authenticated=YES;NSURLCredential*credential=[NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];[challenge.sender useCredential:credential forAuthenticationChallenge:challenge];}else{[[challenge sender]cancelAuthenticationChallenge:challenge];}}// We use this method is to accept an untrusted site which unfortunately we need to do, as our PVM servers are self signed.-(BOOL)connection:(NSURLConnection*)connection canAuthenticateAgainstProtectionSpace:(NSURLProtectionSpace*)protectionSpace{return[protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust];}#pragmamark - NSURLConnectionDataDelegate-(void)connection:(NSURLConnection*)connection didReceiveResponse:(NSURLResponse*)response;{NSLog(@"WebController received response via NSURLConnection");// remake a webview call now that authentication has passed ok._authenticated=YES;[_web loadRequest:_request];// Cancel the URL connection otherwise we double up (webview + url connection, same url = no good!)[_urlConnection cancel];}
以上设置，可成功加载自签名网页。
但是，虽然加载成功，但是控制台还是报了以下错误：
NSURLSession/NSURLConnection HTTP load failed(kCFStreamErrorDomainSSL,-9843)
作者：啃手高手
链接：https://www.jianshu.com/p/91eb1d8817f2
来源：简书
著作权归作者所有。商业转载请联系作者获得授权，非商业转载请注明出处。
