swift - 在 IOS 中使用 Swift 播放 MP4

Question

这似乎是一项简单的任务，但我再次发现自己不知所措。这是代码。它返回“找到视频”，但只显示白屏。帮助!:

import Foundation
import UIKit
import AVFoundation
import MediaPlayer
import AVKit

 class SampleView: UIViewController {
var sw: CGFloat = 0;
var sh: CGFloat = 0;
var hw: CGFloat = 0;

override func viewDidLoad() {
    super.viewDidLoad()
     if let filePath = Bundle.main.path(forResource: theImage, ofType: "mp4") {
        print("found video")
        let videoURL = URL(string: filePath)
        let player = AVPlayer(url: videoURL!)
        let playerViewController = AVPlayerViewController()
        playerViewController.player = player
        self.present(playerViewController, animated: true) {
            playerViewController.player!.play()
        }
     } else{print("no found video")}

Answer 1

您需要将代码移至 viewDidAppear，因为 viewDidLoad View 的层次结构尚未完成，无法呈现任何 VC

override func viewDidAppear(_ animated:Bool) {
    super.viewDidAppear(animated)
     if let filePath = Bundle.main.path(forResource: theImage, ofType: "mp4") {
        print("found video")
        let videoURL = URL(string: filePath)
        let player = AVPlayer(url: videoURL!)
        let playerViewController = AVPlayerViewController()
        playerViewController.player = player
        self.present(playerViewController, animated: true) {
            playerViewController.player!.play()
        }
     } else{print("no found video")
}