iOS ---------NSURLSession/NSURLC

遇到此问题的解决办法：

使用中的didReceiveChallenge方法，方法中的代码如下:

- (void)URLSession:(NSURLSession *)sessiondidReceiveChallenge:(NSURLAuthenticationChallenge *)challenge

completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition disposition,NSURLCredential * __nullable credential))completionHandler

{

NSLog(@"didReceiveChallenge");

completionHandler(NSURLSessionAuthChallengeUseCredential, [NSURLCredentialcredentialForTrust:challenge.protectionSpace.serverTrust]);

}

当然，info.plist里面也要加上下面这段：

NSAppTransportSecurity

NSAllowsArbitraryLoads