[Swift通天遁地]八、媒体与动画-(2)实现视频文件的播放和画中画

 1 import UIKit
 2 //在当前的类文件中，
 3 //引入需要用到的相关类库
 4 import AVFoundation
 5 import AVKit
 6 
 7 class ViewController: UIViewController,AVPlayerViewControllerDelegate {
 8     
 9     var playerVC : AVPlayerViewController!
10     override func viewDidLoad() {
11         super.viewDidLoad()
12         // Do any additional setup after loading the view,typically from a nib.
13         
14         //获得视频文件在项目中的路径。
15         let moviePath = Bundle.main.path(forResource: "Sunrise",ofType: "mp4")
16         //将视频路径转换成网址对象。
17         let movieURL = URL(fileURLWithPath: moviePath!)
18         //初始化一个视频播放器，播放指定的视频文件
19         let avPlayer = AVPlayer(url: movieURL as URL)
20         
21         //let view = UIView(frame: CGRect(x: 20,y: 180,width: 100,height: 100))
22         //view.backgroundColor = .orange
23         //self.view.addSubview(view)
24         
25         //初始化一个视频播放控制器
26         playerVC = AVPlayerViewController()
27         //设置控制器对象的播放属性
28         playerVC.player = avPlayer
29         //保持视频的宽高比，并使播放内容自动适应播放窗口的大小
30         playerVC.videoGravity = AVLayerVideoGravity.resizeAspect
31         //设置在特定的设备上，允许画中画模式
32         playerVC.allowsPictureInPicturePlayback = true
33         //在视频播放时，显示播放控制功能区
34         playerVC.showsPlaybackControls = true
35         //设置播放器的显示区域，保持和根视图的显示区域相同
36         playerVC.view.frame = self.view.bounds
37         //设置播放器的代理对象为本身
38         playerVC.delegate = self
39         
40         //通过调用播放器的播放方法，开始播放视频文件。
41         playerVC.player!.play()
42         //self.view.insertSubview(playerVC.view,belowSubview: view)
43         //将视图播放器视图，添加到根视图中
44         self.view.addSubview(playerVC.view)
45         
46         NotificationCenter.default.addObserver(self,selector: #selector(ViewController.playEnd(notification:)),name: NSNotification.Name.AVPlayerItemDidPlayToEndTime,object: nil)
47     }
48     
49     func playerViewControllerDidStartPictureInPicture(_ playerViewController: AVPlayerViewController) {
50         print("playerViewControllerDidStartPictureInPicture")
51     }
52     
53     @objc func playEnd(notification: Notification)
54     {
55         print("playEnd")
56         print(playerVC.player?.currentTime() as Any)
57         playerVC.player?.seek(to: CMTime(seconds: 1.0,preferredTimescale: CMTimeScale(NSEC_PER_SEC)))
58         playerVC.player!.play()
59     }
60 
61     override func didReceiveMemoryWarning() {
62         super.didReceiveMemoryWarning()
63         // Dispose of any resources that can be recreated.
64     }
65 }