Ios NSURLAuthenticationChallenge.sender返回nil

请原谅我问题中的点符号

我正在使用NSURLSession尝试登录网站。苹果的文档建议以这种方式处理身份验证挑战

- (void)URLSession:(NSURLSession *)session didReceiveChallenge:(NSURLAuthenticationChallenge *)challenge 
                                             completionHandler:(void (^)(NSURLSessionAuthChallengeDisposition, NSURLCredential *))completionHandler
{
    NSURLCredential *credential = [NSURLCredential credentialWithUser:@"<email>"
                                                             password:@"<password>"
                                                          persistence:NSURLCredentialPersistenceNone];
    [[challenge sender] useCredential:credential
           forAuthenticationChallenge:challenge];
}

-（void）URLSession:（NSURLSession*）session didReceiveChallenge:（nsurAuthenticationChallenge*）challenge
completionHandler:（void（^）（NSURLSessionAuthChallengeDisposition，NSURLCredential*）completionHandler
{
NSURLCredential*credential=[NSURLCredential credentialWithUser:@]
密码：@“”
持久性：NSURLEdentialPersistenceOne]；
[[challenge sender]使用凭证：凭证
验证质询：质询]；
}

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问题是[challenge sender]返回nil。我的设置中遗漏了什么吗？

不确定您是否发现了这一点，但您应该调用完成处理程序来代替旧的useCredential方法：

   completionHandler(NSURLSessionAuthChallengeUseCredential, credential);

---

您可以尝试使用http标头进行会话授权：

NSString *userPasswordString = [NSString stringWithFormat:@"%@:%@", user, password];
NSData * userPasswordData = [userPasswordString dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64EncodedCredential = [userPasswordData base64EncodedStringWithOptions:0];
NSString *authString = [NSString stringWithFormat:@"Basic %@", base64EncodedCredential];

configuration.HTTPAdditionalHeaders = @{@"Authorization": authString};

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谢谢你的回复。我最终选择了一个完全不同的方向。我想负责任的做法应该是双倍返回并记录我的反应。这个周末我会尽我最大的努力去做。