获取NSURLConnection委托回调到正确的线程

我似乎无法让代理回调工作，当我线程我的代码。我正在尝试使用NSURLConnection调用远程服务器以获取access_token。 access_token在连接中被接收：didReceiveResponse：delegate。这是不是一个问题，直到我线程。我认为我正在为我的代表传递正确的对象，但它没有达到连接：didReceiveResponse：获取NSURLConnection委托回调到正确的线程

任何人都可以看到为什么连接：didReceiveResponse：在LoginViewController不会调用时，我线程调用？谢谢。

LoginViewController.m

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 
    NSString *access_token = [self getTokenFromResponse: response]; 
    [self.delegate didGetAccessToken:access_token]; 
} 

- (void)fetchAccessTokenNoUI 
{ 
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString: @"www.mysite.com"]]; 
    [NSURLConnection connectionWithRequest:request delegate:self]; 
}

AccessToken.h

@interface AccessToken : NSObject 
@property (atomic, strong) LoginViewController *loginViewController; // doing this to try to keep it persistent 
- (void) fetchAccessTokenWithDelegate: (id <LoginDelegate>)delegate; 
@end

AccessToken.m

- (void) fetchAccessTokenWithDelegate: (id <LoginDelegate>)delegate 
{ 
    dispatch_queue_t downloadQueue = dispatch_queue_create("Fetch access_token queue", NULL); 
    dispatch_async(downloadQueue,^{ 
     // this works fine if I don't do it in a queue 
     self.loginViewController = [[LoginViewController alloc] init]; 
     self.loginViewController.delegate = delegate; 
     [self.loginViewController fetchAccessTokenNoUI]; 

    }); 
    dispatch_release(downloadQueue); 
}

CallingClass.m

- (void)didGetAccessToken:(NSString *)access_token 
{ 
    if (!access_token) 
    { 
     LoginViewController *userProfileViewController = [[LoginViewController alloc] init]; 
     userProfileViewController.delegate = self; 
     [self.navigationController pushViewController:userProfileViewController animated:YES]; 
    } 
} 
- (IBAction)favourite:(id)sender 
{ 
    AccessToken *accessToken = [[AccessToken alloc] init]; 
    [accessToken fetchAccessTokenWithDelegate:self]; 

}

来源

2012-06-19 Raymond

看看http://stackoverflow.com/a/8919203/214350 –

可能重复的[GCD和异步NSURLConnection]（http://stackoverflow.com/questions/8918501/gcd-and-async-nsurlconnection ） –

因此，经过一些更多的研究，我找到了解决方案。

我实际上并不需要AccessToken.h/m。我认为NSURLConnection调用会阻止我的UI线程。但NSURLConnection connectionWithRequest：delegate：会自动在单独的线程中运行。

所以我所要做的就是删除AccessToken.h和AccessToken.m。然后，在CallingClass.m中，我改变favourte：到

- (IBAction)favourite:(id)sender 
{ 
    LoginViewController *loginViewController = [[LoginViewController alloc] init]; 
    [loginViewController fetchAccessTokenWithDelegate:self]; 

}

就是这样！根本不需要dispatch_queue_t。

来源

2012-06-20 18:55:09 Raymond

你有没有把存根实现所需的协议的方法，

-(void)connectionDidFinishLoading:(NSURLConnection *)connection; 
-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error; 
-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data;

因为我有哪去实现他们离开后，类似的问题。

来源

2012-06-19 18:05:26 vellvisher

刚刚尝试过，但没有运气。我甚至在.h中公开它们，但仍然没有工作。 – Raymond

'didReceiveResponse'这个函数根本不被调用？ – vellvisher

号didReceiveResponse没有被调用。它会被连接调用：didReceiveResponse：甚至没有被调用。受你评论的启发，我试着从[LoginViewController fetchAccessTokenNoUI]调用didReceiveResponse，它的工作原理让我相信这意味着代理已正确设置。 – Raymond

获取NSURLConnection委托回调到正确的线程

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