iOS5：willSendRequestForAuthenticationChallenge方法正在运行递归 [英] iOS5: willSendRequestForAuthenticationChallenge method is running recursive

问题描述

我正在使用以下代码对远程服务器的用户进行身份验证。如果我提供了正确的用户名和密码，则没有问题，因为身份验证正在发生，我从服务器获得响应。

I am using the below code for authentication of the user with the remote server.If I am giving correct username and password, there is no issue because authentication is happening and I am getting the response from server.

但是当我提供错误的凭据时，会以递归方式调用此方法，因此我无法解决此问题。

But when I am giving wrong credentials,this method is called in recursive manner, so I am not able to break this.

请帮助我，如何打破这一点，以便我能够显示身份验证失败的警报消息。

Please help me, how to break this so that I should be able to show the authentication failed alert message.

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{

    NSURLCredential *credential = [NSURLCredential credentialWithUser:@"username"
                                                             password:@"password"
                                                          persistence:NSURLCredentialPersistenceForSession];
    [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge];    
}

推荐答案

试试这个。

- (void)connection:(NSURLConnection *)connection willSendRequestForAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
        {

        if ([challenge previousFailureCount] > 0) {
                // do something may be alert message
            } 
        else
        {

            NSURLCredential *credential = [NSURLCredential credentialWithUser:@"username"
                                                                     password:@"password"
                                                                  persistence:NSURLCredentialPersistenceForSession];
            [[challenge sender] useCredential:credential forAuthenticationChallenge:challenge]; 
        }

}

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