AVKit给出了以下错误:在"name class“中隐式地展开nil

Question

I have a series of videos in one folder.

in another folder I have the following code:


import Foundation
import AVKit

var videoPlayer: AVPlayer?

func playVideo(filename: String, fileFormat: String) -> AVPlayer {
    if Bundle.main.url(forResource: filename, withExtension: fileFormat) != nil {
        videoPlayer = AVPlayer(url: Bundle.main.url(forResource: filename, withExtension: fileFormat)!)
        videoPlayer?.play()
    }
    return videoPlayer!
}

在另一个文件夹中，我有以下代码，但在活动中，它不会在SwiftUi中播放视频，因为它给了我以下错误:XXXXXXX.swift中的隐式解包装零值。

import SwiftUI
import AVKit

struct VideoPlayerView: View {
    // MARK: - PROPERTIES
    
    var videoSelected: String
    var videoTitle: String
    
    
    // MARK: - BODY
    var body: some View {
        VideoPlayer(player: playVideo(filename: videoSelected, fileFormat: "mp4"))
    }
}

// MARK: - PREVIEW
struct VideoPlayerView_Previews: PreviewProvider {
    static var previews: some View {
        VideoPlayerView(videoSelected: "lion", videoTitle: "Lion")
    }
}

Answer 1

如果您的文件不存在，则无法显示VideoPlayer。

var body: some View {
  AVPlayer(fileName: videoSelected, fileFormat: "mp4").map(VideoPlayer.init)
}

extension AVPlayer {
  convenience init?(fileName: String, fileFormat: String) {
    guard let url = Bundle.main.url(forResource: fileName, withExtension: fileFormat)
    else { return nil }

    self.init(url: url)
    play()
  }
}