iOS - isViewLoaded崩溃

Question

我有一个代码，检查互联网连接是否存在。如果没有互联网，我会显示警报。下面是代码：

- (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就一定要仅在当前窗口是加载和显示一个显示警报。

但有些时候，当我关闭wifi，我的模拟器崩溃，出现以下错误;

-[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' 

什么是错？

非常感谢

更新：我使用的托尼百万版的可达性，所以testInternetConnection方法被称为每当网络状态的变化。

Answer 1

您的weakSelf变量可能是一个弱指针，并且在代码达到此点时已经释放。