尝试播放视频时解开Optional值时意外发现nil

Question

我正在使用AVFoundation套件播放本地视频

我尝试了以下代码：

import UIKit
import AVFoundation

class ViewController: UIViewController {

var player: AVPlayer?

@IBOutlet weak var videoViewContainer: UIView!


override func viewDidLoad() {
    super.viewDidLoad()
    initializeVideoPlayerWithVideo()
}

func initializeVideoPlayerWithVideo() {

    // get the path string for the video from assets
    let videoString:String? = Bundle.main.path(forResource: "Air Bike", ofType: "mov")
    guard let unwrappedVideoPath = videoString else {return}

    // convert the path string to a url
    let videoUrl = URL(fileURLWithPath: unwrappedVideoPath)

    // initialize the video player with the url
    self.player = AVPlayer(url: videoUrl)

    // create a video layer for the player
    let layer: AVPlayerLayer = AVPlayerLayer(player: player)

    // make the layer the same size as the container view
    layer.frame = videoViewContainer.bounds

    // make the video fill the layer as much as possible while keeping its aspect size
    layer.videoGravity = AVLayerVideoGravity.resizeAspectFill

    // add the layer to the container view
    videoViewContainer.layer.addSublayer(layer)
}


@IBAction func playVideoButtonTapped(_ sender: UIButton) {
    // play the video if the player is initialized
    player?.play()
}
}

我正在尝试几种不同的方法，但是仍然收到相同的错误消息，有人可以如何解决此问题？

Answer 1

**use** 

layer.frame = videoViewContainer.layer.bounds 

代替

 // make the layer the same size as the container view
    layer.frame = videoViewContainer.bounds

Answer 2

func initializeVideoPlayerWithVideo() {

    guard let path = Bundle.main.path(forResource: "jagdeep", ofType:".MOV") else {
        debugPrint("video.m4v not found")
        return
    }

    self.player = AVPlayer(url: URL(fileURLWithPath: path))

    // create a video layer for the player
    let layer: AVPlayerLayer = AVPlayerLayer(player: player)

    // make the layer the same size as the container view
    layer.frame = videoViewContainer.bounds

    // make the video fill the layer as much as possible while keeping its aspect size
    layer.videoGravity = AVLayerVideoGravity.resizeAspectFill

    // add the layer to the container view
    videoViewContainer.layer.addSublayer(layer)

    player?.play()
}

“这里是我的视频名” jagdeep并键入.MOV ，它在我这边工作。这是您使用mov类型的代码中的问题。我只是将视频名称jagdeep.MOV拖到我的项目中，然后使用您的代码。还可以，

Answer 3

谢谢您的回复，似乎找不到文件，这是我的项目的屏幕截图，这可能是视频位于我的主文件夹中的原因！ Screenshot