pip2.swift

import UIKit
import AVFoundation
import AVKit

class ViewController: UIViewController, AVPlayerViewControllerDelegate {
    
    var playerController : AVPlayerViewController!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        
        super.didReceiveMemoryWarning()
    }
    
    @IBAction func play(_ sender: Any) {
        
        let path = Bundle.main.path(forResource: "Apple", ofType: "mp4")!
        
        let url = NSURL(fileURLWithPath: path)

        let player = AVPlayer(url: url as URL)
        
        playerController = AVPlayerViewController()
        
        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.didfinishPlaying(note:)), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: player.currentItem)
        
        playerController.player = player
        
        playerController.allowsPictureInPicturePlayback = true
        
        playerController.delegate = self
        
        playerController.player?.play()
        
        self.present(playerController, animated: true, completion : nil)
        
        
    }
    
    @objc func didfinishPlaying(note : NSNotification)  {
        
        playerController.dismiss(animated: true, completion: nil)
        let alertView = UIAlertController(title: "Finished", message: "Video finished", preferredStyle: .alert)
        alertView.addAction(UIAlertAction(title: "Okey", style: .default, handler: nil))
        self.present(alertView, animated: true, completion: nil)
    }
    
    
    func playerViewController(_ playerViewController: AVPlayerViewController, restoreUserInterfaceForPictureInPictureStopWithCompletionHandler completionHandler: @escaping (Bool) -> Void) {
        
        let currentviewController = navigationController?.visibleViewController
        
        if currentviewController != playerViewController{
            
            currentviewController?.present(playerViewController, animated: true, completion: nil)
            
        }
        
    }
    

    
}