Gesture using AVPlayer

Question

This feature is really important for my application, and I really need help. Basically, I want to add a UIPanGestureRecognizer to a video player so that the user can speed up fast-forward / rewind the video with gestures.

Apple has sample code that uses Swift 3 and has an already created video player. The only thing missing is the UIPanGestureRecognizer . This is the link: https://developer.apple.com/library/content/samplecode/AVFoundationSimplePlayer-iOS/Introduction/Intro.html#//apple_ref/doc/uid/TP40016103

In viewWillAppear I added the same gesture:

 let panGesture = UIPanGestureRecognizer(target: self, action: #selector(handlePanGesture)) view.addGestureRecognizer(panGesture) 

This is code that works somewhat. Currently it is being cleaned.

The problem is that every time I start a panorama gesture, the video skips the middle and I start from there. Instead of fast-forwarding / rewinding from which the video is currently located, the panorama gesture skips the video to the middle, and then allows you to fast forward / rewind, which is not very good.

 func handlePanGesture(sender: UIPanGestureRecognizer) { switch sender.state { case .began, .changed: let translation = sender.translation(in: self.view) var horizontalTranslation = Float(translation.x) let durationInSeconds = Float(CMTimeGetSeconds(player.currentItem!.asset.duration)) // Using 275 as the limit for delta along x let translationLimit: Float = 275 let minTranslation: Float = -1 * translationLimit let maxTranslation: Float = translationLimit if horizontalTranslation > maxTranslation { horizontalTranslation = maxTranslation } if horizontalTranslation < minTranslation { horizontalTranslation = minTranslation } let timeToSeekTo = normalize(delta: horizontalTranslation , minDelta: minTranslation, maxDelta: maxTranslation, minDuration: 0, maxDuration: durationInSeconds) print("horizontal translation \(horizontalTranslation) \n timeToSeekTo: \(timeToSeekTo)") let cmTime = CMTimeMakeWithSeconds(Float64(timeToSeekTo), self.player.currentTime().timescale) player.seek(to: cmTime) default: print("default") } } func normalize(delta: Float, minDelta: Float, maxDelta: Float, minDuration: Float, maxDuration: Float) -> Float { let result = ((delta - minDelta) * (maxDuration - minDuration) / (maxDelta - minDelta) + minDuration) return result } 

Any help would be great - thanks!

Answer 1

I implemented UIPanGesture with AVPlayer , below is my working code [swift 3] .

 func handleDraging(_ gesture:UIPanGestureRecognizer){ let location = gesture.location(in: self.playerView) if gesture.state == .began { print("\n\n-->---> Panning.state = .began at Point.x = \(location.x)") self.playerLayer.player?.rate = 0 self.stopTimer() }else if gesture.state == .changed { let valocity = gesture.velocity(in: self.playerView) print("\n\n-->---> Panning.state = .changed at Point.x = \(location.x)") let percentage = Double(location.x) / Double(self.playerView.frame.width) let currentTime = self.playerLayer.player!.currentTime() let currentSeconds = CMTimeGetSeconds(currentTime) var newSeconds = currentSeconds + percentage if valocity.x < 0 { newSeconds = currentSeconds - percentage } let newTime = CMTime(seconds: newSeconds, preferredTimescale: self.playerLayer.player!.currentTime().timescale) self.playerLayer.player?.seek(to: newTime, toleranceBefore: kCMTimeZero, toleranceAfter: kCMTimeZero) let total = CGFloat(CMTimeGetSeconds(self.playerLayer.player!.currentItem!.asset.duration)) let seconds = CGFloat(CMTimeGetSeconds(newTime)) self.interval = Double(seconds)//here update your CurrentTimelabel.text ..... let temp = seconds/total self.progress = Float(temp)//here update your UIProgressBar.progress ..... print("\n\t-->Total Progress = \(temp)") }else if gesture.state == .ended || gesture.state == .failed || gesture.state == .recognized { gesture.setTranslation(CGPoint.zero, in: self.playerView) self.startTimer() self.playerLayer.player?.playImmediately(atRate: 1) } }