ios – 在xcode模拟器上播放但在设备上播放的视频

我的视频存储在本地.以下是播放我视频的相关源代码：

override func viewDidAppear(animated: Bool) {

        let fileUrl = NSURL(fileURLWithPath: "/Users/User/Desktop/Project_XYZ/Pultz/11005472.mp4")
        playerView = AVPlayer(URL: fileUrl)

        let playerLayer = AVPlayerLayer(player: playerView)
        playerLayer.frame = videoContainer.frame
        playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill


        //playerViewController.player = playerView

        self.view.layer.addSublayer(playerLayer)
        playerView.play()

        NsnotificationCenter.defaultCenter().addObserver(self,SELEctor: #SELEctor(WorkoutDashboardViewController.restart),name: AVPlayerItemDidPlayToEndTimeNotification,object: self.playerView.currentItem)

    }

附：我正在使用的视频是一个免费的水印视频我下了网.这可能是一个可能的原因吗？