推特登录出错后没有拿到错误返回

参考：http://blog.csdn.net/pz789as/article/details/53486568

前不久将推特的授权登录加入到自己的项目中来，今天测试时发现，在没有翻墙时，点击推特登录之后一直没有反应，然后看log发现，推特本身是给出了提示：

did encounter error with message "Error obtaining user auth token.": Error Domain=TWTRLogInErrorDomain Code=-1 "" UserInfo={NSLocalizedDescription=}
 
但是我这边也都对error做了处理和打印，却并没有接收到错误信息，导致应用一直停在waiting状态，无法操作！

调用推特登录代码如下：

[[Twitter sharedInstance] logInWithMethods:TWTRLoginMethodWebBased completion:^(TWTRSession* session, NSError* error) {
if (session){
NSLog(@"signed in as %@", [session userName]);
[self twlCallback:CB_CODE_LOGIN result:
[NSString stringWithFormat:@"{\"userName\": \"%@\",\"userID\": \"%@\",\"authToken\": \"%@\",\"authTokenSecret\": \"%@\"}",
[session userName],
[session userID],
[session authToken],
[session authTokenSecret]
]
];
}else{
NSLog(@"error: %@", [error localizedDescription]);
[self twlCallback:CB_CODE_ERROR
result:[NSString stringWithFormat:@"{\"id\":\"%@\", \"dsc\":\"%@\"}",
ERROR_LOGIN,
[error localizedDescription]]];
}
}];

后面log在判断session外面发现，根本没有回调这个函数。

于是在网上找答案，然后在推特的论坛上找到这么一个答案：
https://twittercommunity.com/t/problem-using-twitterkit-to-login-via-oauth/73379
Thanks for reaching out on this. Have you made any customizations to the 

TWTRLoginMethod

 enum
defined in Twitter.h along with the 

[Twitter
logInWithMethods:completion:]

 method? By default, Twitter Kit will choose log in methods in the following order 

[System
Account]

 -> 

[SFSafariViewController]

 -> 

[UIWebView]

.
With the 

TWTRLoginMethod

 enum,
the developer can choose which methods to use when providing the user with the ability to log in using Twitter.

个人觉得应该是登录的方式不对，于是乎，将上面的代码中的

TWTRLoginMethodWebBased
改成

TWTRLoginMethodAll
就可以拿到结果啦，它会提示timeout，这样就可以做下一步操作了！心情瞬间舒畅了很多啊

改了之后的提示是这样的：

did encounter error with message "Unable to authenticate using the system account.": Error Domain=NSURLErrorDomain Code=-1001 "The request timed out."
然后就可以弹出提示框了：