iOS - isViewLoaded崩溃

Question

我有一个代码，用于检查是否存在互联网连接。如果没有互联网，我会显示警报。这是代码：

- (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确保只显示当前窗口是加载和显示的窗口时的警报。

但有时候，当我关闭wifi时，我的模拟器会因以下错误而崩溃;

-[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'

有什么问题？

非常感谢

更新：我使用Tony Million的Reachability版本，因此只要互联网状态发生变化，就会调用testInternetConnection方法。

Answer 1

您的weakSelf变量可能是一个弱指针，并且在代码到达此点时已经释放。