Add Playback Slider to AVPlayer. Example In Swift.

In this Swift code example, you will learn how to add a playback slider to an AVPlayer, so that users can start playing music from any place they wish. The code example below will cover the following:

• Create AVPlayer and AVPlayerItem,
• Create UIButton programmatically,
• Create AVPlayerLayer and add it as a subview,
• Handle Play Button action to Pause and Play music,
• Add UISlider as a subview,
• Handle UISlider value changed event,
• Determine music file duration in seconds,
• Set the UISlider’s maximumValue equal to the duration of the music file in seconds.

Playback Slide Example

import UIKit
import AVFoundation
class ViewController: UIViewController  {
    
    var player:AVPlayer?
    var playerItem:AVPlayerItem?
    var playButton:UIButton?
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        let url = URL(string: "https://s3.amazonaws.com/kargopolov/kukushka.mp3")
        let playerItem:AVPlayerItem = AVPlayerItem(url: url!)
        player = AVPlayer(playerItem: playerItem)
        
        let playerLayer=AVPlayerLayer(player: player!)
        playerLayer.frame=CGRect(x:0, y:0, width:10, height:50)
        self.view.layer.addSublayer(playerLayer)
        
        playButton = UIButton(type: UIButton.ButtonType.system) as UIButton
        let xPostion:CGFloat = 50
        let yPostion:CGFloat = 100
        let buttonWidth:CGFloat = 150
        let buttonHeight:CGFloat = 45
        
        playButton!.frame = CGRect(x:xPostion, y:yPostion, width:buttonWidth, height:buttonHeight)
        playButton!.backgroundColor = UIColor.lightGray
        playButton!.setTitle("Play", for: UIControl.State.normal)
        playButton!.tintColor = UIColor.black
        //playButton!.addTarget(self, action: Selector("playButtonTapped:"), for: .touchUpInside)
        playButton!.addTarget(self, action: #selector(self.playButtonTapped(_:)), for: .touchUpInside)
        
        self.view.addSubview(playButton!)
        
        
        // Add playback slider
        
        let playbackSlider = UISlider(frame:CGRect(x:10, y:300, width:300, height:20))
        playbackSlider.minimumValue = 0
        
        
        let duration : CMTime = playerItem.asset.duration
        let seconds : Float64 = CMTimeGetSeconds(duration)
        
        playbackSlider.maximumValue = Float(seconds)
        playbackSlider.isContinuous = true
        playbackSlider.tintColor = UIColor.green
        
        playbackSlider.addTarget(self, action: #selector(self.playbackSliderValueChanged(_:)), for: .valueChanged)
       // playbackSlider.addTarget(self, action: "playbackSliderValueChanged:", forControlEvents: .ValueChanged)
        self.view.addSubview(playbackSlider)
        
    }
    
    @objc func playbackSliderValueChanged(_ playbackSlider:UISlider)
    {
        
        let seconds : Int64 = Int64(playbackSlider.value)
        let targetTime:CMTime = CMTimeMake(value: seconds, timescale: 1)
        
        player!.seek(to: targetTime)
        
        if player!.rate == 0
        {
            player?.play()
        }
    }
    
    
   @objc func playButtonTapped(_ sender:UIButton)
    {
        if player?.rate == 0
        {
            player!.play()
            //playButton!.setImage(UIImage(named: "player_control_pause_50px.png"), forState: UIControlState.Normal)
            playButton!.setTitle("Pause", for: UIControl.State.normal)
        } else {
            player!.pause()
            //playButton!.setImage(UIImage(named: "player_control_play_50px.png"), forState: UIControlState.Normal)
            playButton!.setTitle("Play", for: UIControl.State.normal)
        }
    }
    
}

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