AVPlayerViewController 播放速度的自定义控件

Question

1. Can we add custom playback speed (0.5, 1.0, 1.5, 2.0) control to AVPlayerViewController ?
2. Is there a way we can refresh speed rate using an UISlider value change?
3. Can we change the playback speed if it is playing currently?

Answer 1

1. Can we add custom playback speed (0.5, 1.0, 1.5, 2.0) control to AVPlayerViewController ?

You can add a custom playback speed button to AVPlayerViewController by doing a little hack.

In iOS 11, ie, you can add a button to the AVPlayerViewController by adding the control next to the " Play/Pause " button. That button has an Accessible Identifier which will help you find that control.

So, what I did was basically find that " Play/Pause " button and add my Playback Speed button to the superview of the " Play/Pause " button.

func findPlayPauseButton(view: UIView) -> UIView? {
    if view.accessibilityIdentifier == "Play/Pause" {
        return view
    }
    for subview in view.subviews {
        if let result = findPlayPauseButton(view: subview) {
            return result
        }
    }
    return nil
}

guard let playerView = playerViewController?.view else {
    return
}

guard let playPauseButton = findPlayPauseButton(view: playerView) else {
    return
}

if let playerControlsView = playPauseButton.superview {
    let playbackSpeedButton = UIButton(type: .system)
    playbackSpeedButton.accessibilityIdentifier = "PlaybackSpeed"
    playbackSpeedButton.setTitle("1 X", for: .normal)
    playbackSpeedButton.addTarget(self, action: #selector(self.playbackSpeedButtonTapped), for: .touchUpInside)
    playbackSpeedButton.translatesAutoresizingMaskIntoConstraints = false
    playerControlsView.addSubview(playbackSpeedButton)
    NSLayoutConstraint.activate([
        playbackSpeedButton.heightAnchor.constraint(equalTo: playPauseButton.heightAnchor),
        playbackSpeedButton.widthAnchor.constraint(equalToConstant: 50),
        playbackSpeedButton.leadingAnchor.constraint(equalTo: playPauseButton.trailingAnchor, constant: 70),
        playbackSpeedButton.bottomAnchor.constraint(equalTo: playPauseButton.bottomAnchor),
    ])
}

Result:

As you may know, this has a lot of downsides because of all the edge cases that you will find, ie, you need to take care the landscape as well, you need to check if the hack is still valid on every new iOS version, etc. If you app supports iOS 10, then things are different because the UI of the AVPlayerViewController has changed in iOS 11.

2. Is there a way we can refresh speed rate using an UISlider value change?

Yes, instead of a UIButton for changing the playback speed, just add an UISlider .

3. Can we change the playback speed if it is playing currently?

Yes, if it's playing then you just need to change the rate property of the player: for example to 1.25 X => playerViewController.player?.rate = 1.25 .

UPDATE:

Enhancement requested! 🙃 Radar number is 46022646: Playback speed control for AVPlayerViewController (Video) .