Objective c 可达性问题

当我点击按钮显示消息时，我在我的iphone飞机模式下测试了这段代码，但在我连接到互联网的状态下，播放按钮不起作用，我的应用程序退出

代码如下：

-(void)playMovie {
    NSURL *url = [NSURL URLWithString:@"http://www.tvlaayoune.com/iphone/jt.mp4"];
    UIAlertView *errorView;
    if ([[Reachability sharedReachability]
            internetConnectionStatus] == NotReachable) {
        errorView = [[UIAlertView alloc]
                        initWithTitle: @"Unable To Connect To Server" 
                              message: @"Check your network connection and try again."
                             delegate: self
                        cancelButtonTitle: @"OK"
                        otherButtonTitles: nil];
    } else {
        moviePlayer = [[MPMoviePlayerController alloc]
                          initWithContentURL:url];
        [[NSNotificationCenter defaultCenter]
            addObserver:self
               selector:@selector(moviePlayBackDidFinish:)
                   name:MPMoviePlayerPlaybackDidFinishNotification
    object:moviePlayer];
        moviePlayer.controlStyle = MPMovieControlStyleDefault;
        moviePlayer.shouldAutoplay = YES;
        [self.view addSubview:moviePlayer.view];
        [moviePlayer setFullscreen:YES animated:YES];
    } [errorView show];
}

---

有什么问题吗？

如果我理解正确，当您使用internet并想要显示电影时，您的代码会崩溃。在这种情况下，最后一行代码将尝试显示errorView，但如果您有internet，则不会分配它

如果出现以下情况，则在同一位置移动显示呼叫：

-(void)playMovie {
    NSURL *url = [NSURL URLWithString:@"http://www.tvlaayoune.com/iphone/jt.mp4"];
    UIAlertView *errorView;
    if ([[Reachability sharedReachability]
            internetConnectionStatus] == NotReachable) {
        errorView = [[UIAlertView alloc]
                        initWithTitle: @"Unable To Connect To Server" 
                              message: @"Check your network connection and try again."
                             delegate: self
                        cancelButtonTitle: @"OK"
                        otherButtonTitles: nil];



         // Notice this line here:
         [errorView show];


     } else {
        moviePlayer = [[MPMoviePlayerController alloc]
                          initWithContentURL:url];
        [[NSNotificationCenter defaultCenter]
            addObserver:self
               selector:@selector(moviePlayBackDidFinish:)
                   name:MPMoviePlayerPlaybackDidFinishNotification
    object:moviePlayer];
        moviePlayer.controlStyle = MPMovieControlStyleDefault;
        moviePlayer.shouldAutoplay = YES;
        [self.view addSubview:moviePlayer.view];
        [moviePlayer setFullscreen:YES animated:YES];
    } 


    // Removed the show call from here

}

---

问题在于，一旦应用程序退出，您没有引用日志中显示的问题。此外，您不引用应该在调试器中可见的堆栈跟踪。