如何修复 AVPlayer 的视图控制器层次结构？

Question

我有一个带有单人播放器和登录的 iOS 应用程序。它应该像这样工作：

• 1) 运行应用程序
• 2) 登录
• 3) 登录后视频直接开始播放
• 4) 如果您退出视频，它应该询问您是否要退出
• 5) 如果没有应该继续播放流
• 6) 如果是，请退出应用程序
• 7) 如果用户再次登录而没有杀死应用程序，则应重复 2-7 中的步骤

但是，我的代码完成了除了最后一步之外的所有操作。如果用户注销并登录 - 它开始播放流 但是当您单击完成按钮并尝试退出视频时，它不起作用。视频保持全屏显示，并给出以下警告：

Warning: <AVPlayerViewController: 0x7f9fca08aa00> is trying to exit full screen, but is not in its view's window's view controller hierarchy. This results in undefined behavior. 

我对xcode ios和objectiveC真的很陌生，我的代码如下

- (void)viewDidLoad {

    NSLog(@"ChannelListingViewController::viewDidLoad(): Called...");
    [super viewDidLoad];

    self.check=1;

    NSLog(@"ChannelListingViewController::viewDidLoad(): Exiting...");
}

-(void) playVideo
{
    self.channelURL = [TulixAppGlobalConfig getUserSubscribedPlanChannels];


    NSURL *url = [[NSURL alloc] initWithString:[self.channelURL[1] getChannelHlsStreamURL]];
    self.player = [AVPlayer playerWithURL:url];

    // create a player view controller
    [self presentViewController:controller animated:YES completion:nil];
    self.controller.player = self.player;
    [self.player play];

}
-(void) viewDidAppear:(BOOL)animated
{

    self.controller = [[AVPlayerViewController alloc] init];

    NSLog(@"ChannelListingViewController::viewDidAppear(): Called...");
    if(self.check==0)
    {
        NSLog(@" 0 checkvalue: %i",check);
        [self showLogoutConfirmationDialog];
    }
    else{
        self.check =0;
        NSLog(@" 1 checkvalue: %i",check);
        [self playVideo];

    }

    [self spawnKeepAliveThread];
    NSLog(@"ChannelListingViewController::viewDidAppear(): Exiting...");
}

-(void) showLogoutConfirmationDialog
{
    void (^ptrFuncCompletionBlock)(void) = ^(void) {     NSLog(@"ChannelListingViewController::showLogoutConfirmationDialog():GENERIC CALL BACK...");
    [self attemptToLogoutUser];
};
NSLog(@"ChannelListingViewController::showLogoutConfirmationDialog(): Called...");

UIAlertAction* alertActionYes = [UIAlertAction actionWithTitle:@"Yes" style:UIAlertActionStyleDefault
                                                         handler:^(UIAlertAction * action) {
                                                             //Do Some action here
                                                             NSLog(@"ChannelListingViewController::showLogoutConfirmationDialog:: Called for YES...");
                                                             self.check = 1;
                                                             NSLog(@" yes checkvalue: %i",check);
                                                             [self.activeAlterController dismissViewControllerAnimated:NO completion:ptrFuncCompletionBlock];
                                                             [self attemptToLogoutUser];
                                                         }];
UIAlertAction* alertActionNo = [UIAlertAction actionWithTitle:@"No" style:UIAlertActionStyleCancel
                                                          handler:^(UIAlertAction * action) {
                                                              NSLog(@"ChannelListingViewController::showLogoutConfirmationDialog:: Called for NO...");
                                                              [self playVideo];

                                                          }];

NSMutableArray* arrayAlertActions = [NSMutableArray arrayWithObjects:alertActionYes, alertActionNo, nil];
self.activeAlterController = [HelperUtility showMultiButtonDialogHavingTitle:@"Logout" withMessage:@"Are you sure you want to log out?" andAlertActions:arrayAlertActions];

[self presentViewController:self.activeAlterController animated:YES completion:nil];

NSLog(@"ChannelListingViewController::showLogoutConfirmationDialog(): Exit ");

}

我真的不明白为什么它在注销后不起作用并需要帮助。

Answer 1

您只需要将您的 avplayer 控制器与窗口视图相关联。而是只展示 avcontroller 添加以下行-

目标 C-

[self.view.window.rootViewController presentViewController:controller animated:YES completion:nil];

斯威夫特 5 -

view.window.rootViewController?.present(controller, animated: true)