Cocoa 开始图形…将AVPlayerLayer添加到NSView

我看到了一个类似的问题，关于如何将AVPlayerLayer添加到NS视图，但我没有看到完整的源代码来理解它是如何工作的。我的问题的核心是我创建一个玩家对象，并用移动NSURL初始化它。我创建了一个AVPlayerLayer对象并用播放器初始化它。当我尝试将AVPlayerLayer添加到我自己（我是NSView）并运行该程序时，我什么都没有得到

NSURL *movie = [[NSURL alloc]     initWithString:@"file://localhost/Users/matthewmichal/Desktop/A%20Good%20To%20Die%20Hard.mov"];
[player initWithURL:movie];
[self setWantsLayer:YES];
AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
[self.layer addSublayer:playerLayer];
    [player play];

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你可能应该考虑阅读Apple指南：

它没有具体讨论AppKit和UIKit之间的细微差别，但您已经了解了（

[NSView setWantsLayer:

，

[NSView addSublayer]

）。您未正确执行的操作是注册以观察AVPlayer状态属性的更新：

不过，与AVAsset一样，简单地初始化播放器项目并不一定意味着它可以立即播放。您可以观察（使用键值观察）项目的状态属性，以确定它是否以及何时准备好播放

假设所有其他事情都是正确的（这很难从您的代码中分辨出来-例如，您确定NSURL的格式正确吗？），这很可能是错误的-您在玩家准备玩之前将层添加到NSView。如果没有，那么我会确保您的NSURL实际上指向您正在寻找的资源。

Import AVFoundation

#import <AVFoundation/AVFoundation.h> 

假设您的类位于NSView中，告诉NSView您要使用层

[self setWantsLayer:YES];

现在函数

[avPlayer pause];
avPlayer = nil;
playerLayer = nil;

NSURL *videoURL = [NSURL fileURLWithPath:@"file://localhost/Users/matthewmichal/Desktop/A%20Good%20To%20Die%20Hard.mov"];
avPlayer = [AVPlayer playerWithURL:videoURL];
playerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];
playerLayer.frame = self.frame;//or your desired CGRect
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
//playerLayer.masksToBounds = YES;
[self.layer addSublayer:playerLayer];

[avPlayer play];

[avPlayer pause];
avPlayer = nil;
playerLayer = nil;

NSURL *videoURL = [NSURL fileURLWithPath:@"file://localhost/Users/matthewmichal/Desktop/A%20Good%20To%20Die%20Hard.mov"];
avPlayer = [AVPlayer playerWithURL:videoURL];
playerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];
playerLayer.frame = self.frame;//or your desired CGRect
playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
//playerLayer.masksToBounds = YES;
[self.layer addSublayer:playerLayer];

[avPlayer play];