如何攔截在AVPlayerViewController中完成按鈕的敲擊？

Question

我在UIViewController的viewDidAppear方法中創建了AVPlayerViewController和附加的AVPlayer。但是，當我按下「完成」按鈕時，我的自定義視圖控制器會自動解除。

我想攔截這個動作，以便使用我自己的放鬆Segue，但我不知道如何做到這一點。我找到MPMoviePlayerViewController的示例，但不是AVPlayerViewController。

我發現MPMoviePlayerViewController的代碼如下：

- (void)playVideo:(NSString *)aVideoUrl { 
    // Initialize the movie player view controller with a video URL string 
    MPMoviePlayerViewController *playerVC = [[[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL URLWithString:aVideoUrl]] autorelease]; 

    // Remove the movie player view controller from the "playback did finish" notification observers 
    [[NSNotificationCenter defaultCenter] removeObserver:playerVC 
               name:MPMoviePlayerPlaybackDidFinishNotification 
               object:playerVC.moviePlayer]; 

    // Register this class as an observer instead 
    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(movieFinishedCallback:) 
               name:MPMoviePlayerPlaybackDidFinishNotification 
               object:playerVC.moviePlayer]; 

    // Set the modal transition style of your choice 
    playerVC.modalTransitionStyle = UIModalTransitionStyleCrossDissolve; 

    // Present the movie player view controller 
    [self presentModalViewController:playerVC animated:YES]; 

    // Start playback 
    [playerVC.moviePlayer prepareToPlay]; 
    [playerVC.moviePlayer play]; 
} 

- (void)movieFinishedCallback:(NSNotification *)aNotification { 
    // Obtain the reason why the movie playback finished 
    NSNumber *finishReason = [[aNotification userInfo] objectForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey]; 

    // Dismiss the view controller ONLY when the reason is not "playback ended" 
    if ([finishReason intValue] != MPMovieFinishReasonPlaybackEnded) { 
     MPMoviePlayerController *moviePlayer = [aNotification object]; 

     // Remove this class from the observers 
     [[NSNotificationCenter defaultCenter] removeObserver:self 
                 name:MPMoviePlayerPlaybackDidFinishNotification 
                 object:moviePlayer]; 

     // Dismiss the view controller 
     [self dismissModalViewControllerAnimated:YES]; 
    } 
} 

我要求蘋果公司對這個問題，他們已經答覆如下：

感謝您的蘋果開發者技術支持聯繫（DTS ）。我們的 工程師已審覈您的請求，並得出結論認爲 沒有支持的方式來實現 當前的運輸系統配置所需的功能。

Answer 1

我的子類AVPlayerViewController，併發布來自viewWillDisappear的通知，指示解散AVPlayerViewController。

- (void) viewWillDisappear:(BOOL)animated { 
    [[NSNotificationCenter defaultCenter] postNotificationName:kPlayerViewDismissedNotification object:nil]; 
    [super viewWillDisappear:animated]; 
} 

這可能不是100％正確的（因爲如果你有被顯示在AVPlayerViewController另一種觀點認爲它會失敗），但它的工作對我來說AVPlayerViewController總是在堆棧的頂部。

Answer 2

你可以通過繼承AVPLayerViewController來實現。但是由於這個原因有一些不確定的行爲。 （在蘋果文檔中給出。見下文） 我也嘗試了子類化AVPlayerViewController和我面臨的內存問題。

根據蘋果的文檔：

不要繼承AVPlayerViewController。覆蓋此類的 方法不受支持，並導致未定義的行爲。

當前，它們在AVPlayerViewController關閉時不提供回調。 見蘋果開發者論壇：

• Thread1
• Thread2

在線程1蘋果小夥子說：

我仍然相信，通過利用手動管理AVPlayerViewController 實例的出口以上 推薦的手勢的方法是最可靠的方法噸Ø掌握選手視圖控制器 已經被駁回，因爲你將負責其解僱的 指向

希望它能幫助！

---

那麼，這個問題有一個解決辦法。您可以添加一個按鈕作爲AVPlayerViewController的子視圖。通過這樣做，您可以攔截完成的按鈕點按手勢。

Answer 3

由於似乎沒有在這裏任何完美的答案，你可以使用某些情況下，一個解決方法是監測AVPlayer是否仍在播放，並設置情況下，它正在發揮，一路過關斬將後自動關閉的觀察員。

var player:AVPlayer = AVPlayer() 
    var videoPlayTimer:NSTimer = NSTimer() 

    func playVideo(action: UIAlertAction) -> Void { 

    player = AVPlayer(URL: NSURL(fileURLWithPath: myFilePath)) 
    player.actionAtItemEnd = .None 

    let playerController = AVPlayerViewController() 
    playerController.player = player 
    self.presentViewController(playerController, animated: true) {  
     self.player.play() 
     self.monitorVideoPlayStatus() 
     NSNotificationCenter.defaultCenter().addObserver(self, selector: #selector(MyViewController.onVideoEnd(_:)), name: AVPlayerItemDidPlayToEndTimeNotification, object: self.player.currentItem) 
    } 
    } 

    //setting a timer to monitor video play status in case it is closed by user 
    func monitorVideoPlayStatus(){ 
    if ((player.rate != 0) && (player.error == nil)) { 
     NSLog("player is playing") 
     videoPlayTimer = NSTimer.after(0.5, monitorVideoPlayStatus) 
    } else { 
     NSLog("player is NOT playing") 
     onVideoEnd() 
    } 
    } 

    //will be called when video plays all the way through 
    func onVideoEnd(note: NSNotification){ 
    NSLog("onVideoEnd") 
    onVideoEnd() 

    //canceling video play monitor 
    videoPlayTimer.invalidate() 
    } 

    func onVideoEnd(){ 
    NSLog("finished playing video") 
    NSNotificationCenter.defaultCenter().removeObserver(self, name: AVPlayerItemDidPlayToEndTimeNotification, object: nil) 

    //******* 
    //DO WHATEVER YOU WANT AFTER VIDEO HAS ENDED RIGHT HERE 
    //******* 
    } 

Answer 4

一種方式是通過搜索相應的UIButton AVPlayerViewController的子視圖裏面附加的操作添加到在AVPlayerViewController現有的「完成」按鈕。一旦按鈕被發現，使用addTarget添加自定義操作：操作：forControlEvents：

至少，這對我的作品。

- (UIButton*)findButtonOnView:(UIView*)view withText:(NSString*)text 
{ 
    __block UIButton *retButton = nil; 

    [view.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { 
     if([obj isKindOfClass:[UIButton class]]) { 
      UIButton *button = (UIButton*)obj; 
      if([button.titleLabel.text isEqualToString:text]) { 
       retButton = button; 
       *stop = YES; 
      } 
     } 
     else if([obj isKindOfClass:[UIView class]]) { 
      retButton = [self findButtonOnView:obj withText:text]; 

      if(retButton) { 
       *stop = YES; 
      } 
     } 
    }]; 

    return retButton; 
} 

- (void)showPlayer:(AVPlayer*)player 
{ 
    AVPlayerViewController *vc = [[AVPlayerViewController alloc] init]; 
    vc.player = player; 

    [self presentViewController:vc animated:NO completion:^{ 
     UIButton *doneButton = [self findButtonOnView:vc.view withText:@"Done"]; 
     [doneButton addTarget:self action:@selector(doneAction:) forControlEvents:UIControlEventTouchUpInside]; 
     [vc.player play]; 
    }]; 

} 

- (void)doneAction:(UIButton*)button 
{ 
    // perform any action required here 
} 

Answer 5

事實上，Apple沒有提供處理完成按鈕的內置方式，這令人失望。

我不覺得像AVPlayerViewController繼承，因爲它不是由蘋果公司支持，可能會在未來的iOS更新的一個開拓一罐蠕蟲。

我的解決辦法是有一個定時器火災每200毫秒，檢查以下條件：

if (playerVC.player.rate == 0 && 
    (playerVC.isBeingDismissed || playerVC.nextResponder == nil)) { 
    // Handle user Done button click and invalidate timer 
} 

玩家的0 rate屬性指示視頻不再播放。如果視圖控制器被解散或已被解僱，我們可以安全地假定用戶點擊了完成按鈕。

Answer 6

下面是代碼，我如何成功地檢測到點擊。

在應用程序委託類。但它會檢測在該視圖中找到的每個按鈕。你可以添加一些控件，檢查標題類似的東西。

-(UIInterfaceOrientationMask)application:(UIApplication *)application supportedInterfaceOrientationsForWindow:(UIWindow *)window{ 
    if ([window.rootViewController isKindOfClass:[AVPlayerViewController class]]) { 
     return UIInterfaceOrientationMaskAll; 
    } 
    else if(window.rootViewController.presentedViewController != nil) 
    { 
     if ([window.rootViewController.presentedViewController isKindOfClass:[AVPlayerViewController class]] || [window.rootViewController.presentedViewController isKindOfClass:NSClassFromString(@"AVFullScreenViewController")]) { 
      if ([window.rootViewController.presentedViewController isKindOfClass:NSClassFromString(@"AVFullScreenViewController")]) { 
       [self findAllButton:window.rootViewController.presentedViewController.view]; 
      } 
      return UIInterfaceOrientationMaskAll; 
     } 
    } 
    [[UIDevice currentDevice] setValue:@(UIInterfaceOrientationPortrait) forKey:@"orientation"]; 
    [[UIApplication sharedApplication] setStatusBarHidden:NO]; 
    return UIInterfaceOrientationMaskPortrait; 
} 

-(void)findAllButton:(UIView*)view{ 
    for (UIView *subV in view.subviews) { 
     if ([subV isKindOfClass:[UIButton class]]) { 
      NSLog(@"%@",[((UIButton*)subV) titleForState:UIControlStateNormal]); 
      [((UIButton*)subV) addTarget:self action:@selector(doneButtonCliked) forControlEvents:UIControlEventTouchUpInside]; 
     } 
     else{ 
      [self findAllButton:subV]; 
     } 
    } 
} 
-(IBAction)doneButtonCliked{ 
    NSLog(@"DONECLICK"); 
} 

Answer 7

如果您有呈現AVPlayerViewController視圖控制器A，你也許可以爲您在viewDidAppear/VC viewWillAppear中A內部每當那些被稱爲，至少我們知道，AVPlayerViewController不再顯示，從而不應該玩。

Answer 8

我解決了保持對AVPlayerViewController實例的弱引用，並使用定時器進行監視，其中引用更改爲nil。

private weak var _playerViewController : AVPlayerViewController? // global reference 
    ... 
    ... 
    let playerController = AVPlayerViewController() // local reference 
    ... 
    self.present(playerController, animated: true) { [weak self] in 
     playerController.player?.play() 
     self?._playerViewController = playerController 
     // schedule a timer to intercept player dismissal 
     Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { [weak self] (timer) in 
     if self?.playerViewController == nil { 
      // player vc dismissed 
      timer.invalidate() 
     } 
}