即使網絡出現故障，nsurlconnecion也不返回nil

Question

很新的網絡編程和特別客觀的c網絡...
即使我關閉了計算機上的網絡接口，或者將我的iPhone設置爲風險模式， NSURLConnection不會 返回零與應用程序死亡的不愉快的驚喜。

我符合NSURLConnection的協議與正確的回調方法...

所以，你會怎麼處理這種情況的客戶端沒有互聯網連接的情況下？

的代碼片段，我登錄數據上傳到服務器：

-(void)Login { 
    ... 
    NSURLConnection *theConnection = [NSURLConnection connectionWithRequest:post delegate:self]; 
    if (theConnection==nil) { 
     //Here I want to show an alert but this case never happens.... 
    } 
    else { 
     receivedData=[[NSMutableData data] retain]; 
    } 
} 
... 


//This callback is called correctly but no alert shows up and after this method app dies. 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 
    [connection release]; 
    [receivedData release]; 
    [self setLoggedIn:NO]; 
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" 
               message:[error localizedDescription] 
               delegate:self 
               cancelButtonTitle:@"OK" 
               otherButtonTitles: nil]; 
    [alert show]; 
    [alert release]; 
} 

Answer 1

您的應用程序可能會崩潰，因爲你釋放連接對象，即使你沒有擁有它。從委託方法中刪除[connection release];。