在 applicationWillResignActive 时暂停视频并在 applicationDidBecomeActive 时播放视频

Question

好的，我的代码全屏播放电影，无需用户控制（基本上是电影）。电影结束后，我的 NSNotification 会触发并加载视图。

然而，当用户在其中一部电影中按下主页按钮时，它会暂停，但无法让它再次播放，因为我拿走了控件。我尝试将 [playerController play] 和 [playerController ShouldAutoplay] 放在我的 AppDelegate.m 中的 applicationDidBecomeActive 下，但它没有在那里定义，所以它不知道playerController 是什么。

如果用户收到短信或点击主页按钮，任何人都可以帮助我正确暂停和播放该视频吗？

-(IBAction)playMovie:(id)sender {
NSString *movieUrl = [[NSBundle mainBundle] pathForResource:@"Initiate" ofType:@"m4v"]; playerController = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:movieUrl]];

[playerController.view setFrame: self.view.bounds];    
[self.view addSubview:playerController.view];
playerController.controlStyle = MPMovieControlStyleNone;
[playerController shouldAutoplay];
[playerController play];


[[NSNotificationCenter defaultCenter] addObserver:self
                                           selector:@selector(playbackFinished:) 
                                           name:MPMoviePlayerPlaybackDidFinishNotification
                                           object:playerController];
}
- (void)playbackFinished:(NSNotification*) notification {
 playerController = [notification object];
 [[NSNotificationCenter defaultCenter] 
 removeObserver:self
 name:MPMoviePlayerPlaybackDidFinishNotification
 object:playerController];


ViewController *viewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:nil];
viewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentModalViewController:viewController animated:YES];

编辑：

标头

//ViewController.h

@interface ViewController : UIViewController {
MPMoviePlayerController *playerController;
}

实现

//ViewController.m
playerController = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:movieUrl]];

    AppDelegate *sharedAppDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    sharedAppDelegate.pointer = playerController;

Answer 1

实现播放器时，将所有必要的指针发送到应用程序委托：

AppDelegate *sharedAppDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
sharedAppDelegate.yourPointer = yourPlayer;

使用 appDelegate.m 中的此方法：

- (void)applicationWillResignActive:(UIApplication *)application
{
    /*
     Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
     Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
     */
}

- (void)applicationDidBecomeActive:(UIApplication *)application
{
    /*
     Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
     */
}