iOS - isViewLoaded崩潰

Question

我有一個代碼，檢查互聯網連接是否存在。如果沒有互聯網，我會顯示警報。下面是代碼：

- (void)testInternetConnection 
{ 
    __unsafe_unretained typeof(self) weakSelf = self; 
    internetReachableFoo = [Reachability reachabilityWithHostname:@"www.your-voc.com"]; 

    // Internet is reachable 
    internetReachableFoo.reachableBlock = ^(Reachability*reach) 
    { 
     // Update the UI on the main thread 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      internetActivated = YES; 
      NSLog(@"Yayyy, we have the interwebs!"); 
     }); 
    }; 

    // Internet is not reachable 
    internetReachableFoo.unreachableBlock = ^(Reachability*reach) 
    { 
     // Update the UI on the main thread 
     dispatch_async(dispatch_get_main_queue(), ^{ 
      internetActivated = NO; 
      if(alertLoaded == NO){ 
       if(weakSelf.isViewLoaded && weakSelf.view.window){ 
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Pas de connexion internet" message:@"Une connexion est requise pour utiliser l'application" delegate:weakSelf cancelButtonTitle:nil otherButtonTitles:@"Réessayer", @"Mode hors-ligne", nil]; 
        [alert show]; 
        alertLoaded = YES; 
       } 
      } 
      NSLog(@"Someone broke the internet :("); 
     }); 
    }; 

    [internetReachableFoo startNotifier]; 
} 

我使用isViewLoaded和view.window就一定要僅在當前窗口是加載和顯示一個顯示警報。

但有些時候，當我關閉wifi，我的模擬器崩潰，出現以下錯誤;

-[UIScrollViewDelayedTouchesBeganGestureRecognizer isViewLoaded]: unrecognized selector sent to instance 0x7fbe73da4060 
2014-12-05 14:16:57.142 [838:117938] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UIScrollViewDelayedTouchesBeganGestureRecognizer isViewLoaded]: unrecognized selector sent to instance 0x7fbe73da4060' 

什麼是錯？

非常感謝

更新：我使用的託尼百萬版的可達性，所以testInternetConnection方法被稱爲每當網絡狀態的變化。

Answer 1

您的weakSelf變量可能是一個弱指針，並且在代碼達到此點時已經釋放。