objective-c - AVPlayer 播放声音，但在 Mac 应用程序中不显示 View

Question

我想在 Macintosh 应用程序上的 AVPlayer 中播放本地电影。我创建了简单的代码，但电影不想显示已播放的电影。它播放电影的声音，但看不到任何 View 。我错过了什么？

这是我第一个玩简单的应用程序。

我的代码:

@implementation MasterViewController

    - (void)viewDidLoad {
    [super viewDidLoad];

    NSView *containerView = [[NSView alloc] initWithFrame:CGRectMake(0.0f, 0, 390.0f, 400.0f)];


NSString *videoPath = [[NSBundle mainBundle] pathForResource: @"Fatality.mp4" ofType:nil];
NSLog(@"%@", videoPath);



NSURL *fileURL = [NSURL fileURLWithPath:videoPath];
self.player = [AVPlayer playerWithURL:fileURL];
AVPlayerLayer *layer = [AVPlayerLayer playerLayerWithPlayer:self.player];
self.player.actionAtItemEnd = AVPlayerActionAtItemEndNone;

layer.frame = CGRectMake(0, 0, 1024, 768);
[self.view.layer addSublayer: layer];

[self.player play];

}

@end

和AppDelegate:

@interface AppDelegate ()

@property (weak) IBOutlet NSWindow *window;
@property (nonatomic,strong) IBOutlet MasterViewController *masterViewController;
@end

@implementation AppDelegate

- (void)applicationDidFinishLaunching:(NSNotification *)aNotification {
    // Insert code here to initialize your application

    self.masterViewController = [[MasterViewController alloc] initWithNibName:@"MasterViewController" bundle:nil];

    // 2. Add the view controller to the Window's content view
    [self.window.contentView addSubview:self.masterViewController.view];
    self.masterViewController.view.frame = ((NSView*)self.window.contentView).bounds;


}

- (void)applicationWillTerminate:(NSNotification *)aNotification {
    // Insert code here to tear down your application
}

@end

Answer 1

您必须将您的containerView添加为主视图 Controller View 的 subview

[self.view addSubView:containerView];

我在调试时经常使用的一个技巧是将我感兴趣的 View 的背景颜色设置为明亮的颜色(红色、黄色、青色......)，然后确保 View 显示在我期望的位置是。