将视频播放大小调整为UIView大小

Question

我有一个基于VideoPlayer类的UIView，当我打开视频文件时，它不“适合” UIView的边界。这会导致顶部和底部位于UIView之外，并且看不到播放控件。

我尝试将“内容模式”设置为“缩放以适合”，“长宽比适合”，“长宽比填充”等，但没有任何作用。

如何使其“填充” UIView？

PlayerViewClass：

import AVFoundation
import AVKit

class PlayerViewClass: UIView {

    override static var layerClass: AnyClass{
        return AVPlayerLayer.self;
    }

    var playerLayer: AVPlayerLayer{
        return layer as! AVPlayerLayer
    }

    var player: AVPlayer?{
        get{
            return playerLayer.player
        }
        set{
            playerLayer.player = newValue
        }
    }
}

在我的主要ViewController.swift类中：

@IBOutlet weak var cameraView: PlayerViewlass!
    func getCacheDirectory () -> URL {
    // return the documents url
    let fm = FileManager.default
    let docsUrl = try! fm.url(for:.documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false)
    return docsUrl
}

func getFileURL() -> URL{
    // Get url of the file
    let path = getCacheDirectory()
    let filePath = path.appendingPathComponent("\(videoFileName)")
    return filePath
}

@IBAction func playVideoFile(_ sender: Any) {
    let path = getFileURL()
    let player = AVPlayer(url: path)
    cameraView.playerLayer.player = player
    cameraView.player?.play()
}