AVPlayer freezing when pan gesture is made

Question

I'm developing an music app written in swift 2.0.
Right now, I'm implementing video player part with AVPlayer.

I wanted to add a feature that if user swipes down any place in the modal(in the movie player), the modal gets dismissed downward. (like as ios youtube player; they don't actually dissmiss the player though)

I researched how to implement this feature and found the solution below

Stackoverflow answer : In iOS, how to drag down to dismiss a modal?
Full Tutorial : http://www.thorntech.com/2016/02/ios-tutorial-close-modal-dragging/

It works well but there is a problem that AVPlayer is freezing when the pan gesture is made (while holding a finger on the screen). The Audio is playing normally. Only the video is freezing.

Here is the code handling pan gestures.

@IBAction func handleGesture(sender: UIPanGestureRecognizer) {

        let percentThreshold:CGFloat = 0.2

        // convert y-position to downward pull progress (percentage)
        let translation = sender.translationInView(view)
        let verticalMovement = translation.y / view.bounds.height
        let downwardMovement = fmaxf(Float(verticalMovement), 0.0)
        let downwardMovementPercent = fminf(downwardMovement, 1.0)
        let progress = CGFloat(downwardMovementPercent)

        guard let interactor = interactor else { return }

        switch sender.state {
        case .Began:
            interactor.hasStarted = true
            dismissViewControllerAnimated(true, completion: nil)
        case .Changed:
            interactor.shouldFinish = progress > percentThreshold
            interactor.updateInteractiveTransition(progress)
        case .Cancelled:
            interactor.hasStarted = false
            interactor.cancelInteractiveTransition()
        case .Ended:
            interactor.hasStarted = false
            if interactor.shouldFinish {
                interactor.finishInteractiveTransition()
            } else {
                interactor.cancelInteractiveTransition()
            }
        default:
            break
        }
    }

After "dismissViewControllerAnimated(true, completion: nil)" is called (case .Began:), "currentVideoFrameRate" (avPlayer.currentItem?.tracks.first?.currentVideoFrameRate) is reduced from approx. 29 to 4.

It seems the rate controlled internally. I still don't know how to prevent from lowering the frame rate.
I want to make AVPlayer play video normally even if it is on transitioning (.Changed status)
Does anyone know how to fix this issue?

Thanks!

Hey kyle, have you had any luck with this problem? I'm having the same issue, can't seem to find a solution. — Dan
Nope.. I still have the issue. Temporarily I removed an animation effect for transitioning. let me know if you find a solution! — kyle

Anil Kumar Anil Kumar · Accepted Answer · 2020-03-05T09:49:25

In swift 5.0 in AVPlayerViewControllerDelegate Method:

func playerViewController(_ playerViewController: AVPlayerViewController, willEndFullScreenPresentationWithAnimationCoordinator coordinator: UIViewControllerTransitionCoordinator){
        playerViewController.dismiss(animated: true, completion: nil)
    }

Will solve the issue.

AVPlayer freezing when pan gesture is made

1 Answers