公司服务端更新了https，而使用的是自签名的证书，导致iOS开发过程中调用HTTPS接口时，证书不被信任，出现了Default TLS Trust evaluation failed。

解决办法如下：

NSURLSession初始化时添加代理，然后在代理方法中做证书相关处理

NSURL *url = [NSURL URLWithString:[mutableStringUrl stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLQueryAllowedCharacterSet]]];
NSURLRequest *request = [NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringLocalCacheData timeoutInterval:10];
NSURLSession *session = [NSURLSession sessionWithConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration] delegate:self delegateQueue:[[NSOperationQueue alloc]init]];
NSURLSessionDataTask * dataTask = [session dataTaskWithRequest:request completionHandler:^(NSData * _Nullable data, NSURLResponse * _Nullable response, NSError * _Nullable error) {
    if (error) {
        failureBlock(error);
     } else {
        NSString * result = [[NSString alloc] initWithData:data  encoding:NSUTF8StringEncoding];
        successBlock(result);
     }
}];
[dataTask resume];

解决方式有两种：

1.跳过TLS认证，信任所有证书
2.设置白名单，把签名证书加到工程中，做校验

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential * _Nullable))completionHandler {
    1.方法一
    if([challenge.protectionSpace.authenticationMethod isEqualToString:NSURLAuthenticationMethodServerTrust]){
        NSURLCredential *credential = [NSURLCredential credentialForTrust:challenge.protectionSpace.serverTrust];
        if(completionHandler)
            completionHandler(NSURLSessionAuthChallengeUseCredential,credential);
    }
    
    2.方法二
//    SecTrustRef servertrust = challenge.protectionSpace.serverTrust;
//    SecCertificateRef certi= SecTrustGetCertificateAtIndex(servertrust, 0);
//    NSData *certidata = CFBridgingRelease(CFBridgingRetain(CFBridgingRelease(SecCertificateCopyData(certi))));
//    NSString *path = [[NSBundle mainBundle] pathForResource:@"zwp" ofType:@"cer"];
//    NSLog(@"证书 ： %@",path);
//    NSData *localCertiData = [NSData dataWithContentsOfFile:path];
//    if ([certidata isEqualToData:localCertiData]) {
//        NSURLCredential *credential = [[NSURLCredential alloc] initWithTrust:servertrust];
//        [challenge.sender useCredential:credential forAuthenticationChallenge:challenge];
//        completionHandler(NSURLSessionAuthChallengeUseCredential, credential);
//        NSLog(@"服务端证书认证通过");
//    }else {
//        completionHandler(NSURLSessionAuthChallengeCancelAuthenticationChallenge, nil);
//        NSLog(@"服务端认证失败");
//    }
    
}