NSURLAuthenticationChallenge.sender返回nil

Question

请原谅我问题中的点符号。

我正在使用NSURLSession尝试登录一个网站。Apple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];
}

问题是质询发送者返回nil。我是不是在设置中遗漏了什么？

Answer 1

我不确定您是否弄清楚了这一点，但是您应该调用完成处理程序来代替旧的useCredential方法：

   completionHandler(NSURLSessionAuthChallengeUseCredential, credential);

Answer 2

您可以尝试使用http header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};