问如何使用AVPlayer播放视频？

EN

import Foundation
import UIKit

final class AVPlayerView : UIView {
    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)!
    }
    override init(frame: CGRect) {
        super.init(frame: frame)
    }
    override public class var layerClass: Swift.AnyClass {
        get {
            return AVPlayerView.self
        }
    }

import UIKit
import AVFoundation
import CoreMedia

class ViewController: UIViewController {
    var playerItem : AVPlayerItem!
    var videoPlayer : AVPlayer!

    override func viewDidLoad() {
        super.viewDidLoad()
        let url:NSURL = NSURL(string: "https://aaa.com/test.m3u8")!
        let avAsset = AVURLAsset(url: url as URL, options: nil)

        playerItem = AVPlayerItem(asset: avAsset)

        videoPlayer = AVPlayer(playerItem: playerItem)

        print(self.view.bounds)
        let videoPlayerView = AVPlayerView(frame: self.view.bounds)

        let layer = videoPlayerView.layer as! AVPlayerLayer
        layer.videoGravity = AVLayerVideoGravityResizeAspect
        layer.player = videoPlayer

        self.view.layer.addSublayer(layer)
        videoPlayer.play()
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
}