NSURLConnection的didCancelAuthenticationChallenge委托方法从未调用

Question

为什么NSURLConnection的didCancelAuthenticationChallenge委托方法永远不会被调用，即使在手动取消Auth挑战（实际上会按照假设取消）之后呢？

我粘贴下面的相关代码的一些位，记住，像预想的那样，除了- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge

感谢所有帮助被称为所有其他委托方法。 //迭戈

... 
NSURLConnection *serviceConnection = [NSURLConnection connectionWithRequest:serviceRequest delegate:self]; 
... 
- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { 
    NSUserDefaults *ud = [NSUserDefaults standardUserDefaults]; 
    if ([challenge previousFailureCount]) { 
     NSLog(@"Invalid credentials... Cancelling."); 
     [[challenge sender] cancelAuthenticationChallenge:challenge]; 
      // AT THIS POINT cancelAuthenticationChallenge HAS BEEN CALLED, YET, DELEGATE METHOD IS NOT CALLED. 
    } else { 
     if ([ud stringForKey:@"username"] && [ud stringForKey:@"password"]) { 
      NSLog(@"Service is trying to login with locally stored user and password from NSUserDefaults"); 
      NSURLCredential *credential = [NSURLCredential credentialWithUser:[ud stringForKey:@"username"] 
                    password:[ud stringForKey:@"password"] 
                    persistence:NSURLCredentialPersistenceForSession]; 
      [[challenge sender]useCredential:credential forAuthenticationChallenge:challenge]; 
     } else { 
      [delegate STServiceNeedsLoginInfo:self]; 
     } 
    } 
} 




- (void)connection:(NSURLConnection *)connection didCancelAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge { 
    NSLog(@"Failed login with status code: %d", [(NSHTTPURLResponse*)[challenge failureResponse]statusCode]); 
    // THIS METHOD IS NEVER CALLED. WHY ? 
} 

Answer 1

我相信提供用于连接是否取消认证，不是你的委托方法。例如如果您花了太长时间来应对挑战，则连接理论上可能会取消身份验证。