獲取NSURLConnection委託回調到正確的線程

Question

我似乎無法讓代理回調工作，當我線程我的代碼。我正在嘗試使用NSURLConnection調用遠程服務器以獲取access_token。 access_token在連接中被接收：didReceiveResponse：delegate。這是不是一個問題，直到我線程。我認爲我正在爲我的代表傳遞正確的對象，但它沒有達到連接：didReceiveResponse：

任何人都可以看到爲什麼連接：didReceiveResponse：在LoginViewController不會調用時，我線程調用？謝謝。

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]; 

} 

Answer 1

因此，經過一些更多的研究，我找到了解決方案。

我實際上並不需要AccessToken.h/m。我認爲NSURLConnection調用會阻止我的UI線程。但NSURLConnection connectionWithRequest：delegate：會自動在單獨的線程中運行。

所以我所要做的就是刪除AccessToken.h和AccessToken.m。然後，在CallingClass.m中，我改變favourte：到

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

} 

就是這樣！根本不需要dispatch_queue_t。

Answer 2

你有沒有把存根實現所需的協議的方法，

-(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; 

因爲我有哪去實現他們離開後，類似的問題。