AVPlayer doesn't play video until a video from UIImagePickerController is played

问题

I'm having a problem which I haven't seen a post like it on here. I have an AVPlayerViewController which plays a video based off the path from my Firebase Database (not Storage). The video plays perfectly as I want it to, but only once I watch a video that is clicked on in the UIImagePickerController elsewhere in the app. So for example, the AVPlayer will show a black background (this occurs with all of the AVPlayer's in the app), except for when I watch a video from the UIImagePickerController which has nothing to do with any of the other views. I have no clue on where to start with this. I appreciate all your help and suggestions!

Here is the example code of my AVPlayerViewController:

import UIKit
import AVFoundation
import AVKit

class VideoView: UIViewController {

private var videoURL: URL
var player: AVPlayer?
var playerController : AVPlayerViewController?

init(videoURL: URL) {
    self.videoURL = videoURL
    super.init(nibName: nil, bundle: nil)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}


override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.gray
    player = AVPlayer(url: videoURL)
    playerController = AVPlayerViewController()

    guard player != nil && playerController != nil else {
        return
    }
    playerController!.showsPlaybackControls = false

    playerController!.player = player!
    self.addChild(playerController!)
    self.view.addSubview(playerController!.view)
    playerController!.view.frame = view.frame
    NotificationCenter.default.addObserver(self, selector: #selector(playerItemDidReachEnd), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.player!.currentItem)

    let cancelButton = UIButton(frame: CGRect(x: 10.0, y: 10.0, width: 30.0, height: 30.0))
    cancelButton.setImage(#imageLiteral(resourceName: "cancel"), for: UIControl.State())
    cancelButton.addTarget(self, action: #selector(cancel), for: .touchUpInside)
    view.addSubview(cancelButton)


    // Allow background audio to continue to play
    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.ambient)
    } catch let error as NSError {
        print(error)
    }

    do {
        try AVAudioSession.sharedInstance().setActive(true)
    } catch let error as NSError {
        print(error)
    }
}

override func viewDidAppear(_ animated: Bool) {
    super.viewDidAppear(animated)
    player?.play()
}

@objc func cancel() {
    dismiss(animated: true, completion: nil)
}

@objc fileprivate func playerItemDidReachEnd(_ notification: Notification) {
    if self.player != nil {
        self.player!.seek(to: CMTime.zero)
        self.player!.play()
    }
}

}

来源：https://stackoverflow.com/questions/60699431/avplayer-doesnt-play-video-until-a-video-from-uiimagepickercontroller-is-played

标签

ios

swift

avplayer

avplayerviewcontroller