I am using AvPlayer and am trying to set up a slider to allow scrubbing of audio files. Im having a problem with the slider jumping all over the place when its selected. It then goes back to the origin position for a second before going back to the location it was dragged to.
You cant see my cursor on the Gif, but the smooth elongated drags are me moving the knob, then the quick whips are the slider misbehaving.
Ive spent hours googling and combing through Stack Overflow and cant figure out what I'm doing wrong here, a lot of similar questions are quite old and in ObjC.
This is the section of code i think is responsible for the problem, it does handle the event of the slider being moved: Ive tried it without the if statement also and didn't see a different result.
@IBAction func horizontalSliderActioned(_ sender: Any) {
horizontalSlider.isContinuous = true
if self.horizontalSlider.isTouchInside {
audioPlayer?.pause()
let seconds : Int64 = Int64(horizontalSlider.value)
let preferredTimeScale : Int32 = 1
let seekTime : CMTime = CMTimeMake(seconds, preferredTimeScale)
audioPlayerItem?.seek(to: seekTime)
audioPlayer?.play()
} else {
let duration : CMTime = (self.audioPlayer?.currentItem!.asset.duration)!
let seconds : Float64 = CMTimeGetSeconds(duration)
self.horizontalSlider.value = Float(seconds)
}
}
I will include my entire class below for reference.
import UIKit
import Parse
import AVFoundation
import AVKit
class PlayerViewController: UIViewController, AVAudioPlayerDelegate {
@IBOutlet var horizontalSlider: UISlider!
var selectedAudio: String!
var audioPlayer: AVPlayer?
var audioPlayerItem: AVPlayerItem?
var timer: Timer?
func getAudio() {
let query = PFQuery(className: "Part")
query.whereKey("objectId", equalTo: selectedAudio)
query.getFirstObjectInBackground { (object, error) in
if error != nil || object == nil {
print("The getFirstObject request failed.")
} else {
print("There is an object now get the Audio. ")
let audioFileURL = (object?.object(forKey: "partAudio") as! PFFile).url
self.audioPlayerItem = AVPlayerItem(url: NSURL(string: audioFileURL!) as! URL)
self.audioPlayer = AVPlayer(playerItem: self.audioPlayerItem)
let playerLayer = AVPlayerLayer(player: self.audioPlayer)
playerLayer.frame = CGRect(x: 0, y: 0, width: 10, height: 10)
self.view.layer.addSublayer(playerLayer)
let duration : CMTime = (self.audioPlayer?.currentItem!.asset.duration)!
let seconds : Float64 = CMTimeGetSeconds(duration)
let maxTime : Float = Float(seconds)
self.horizontalSlider.maximumValue = maxTime
self.audioPlayer?.play()
self.timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(PlayerViewController.audioSliderUpdate), userInfo: nil, repeats: true)
}
}
}
@IBOutlet var playerButton: UIButton!
func playerButtonTapped() {
if audioPlayer?.rate == 0 {
audioPlayer?.play()
self.playerButton.setImage(UIImage(named: "play"), for: UIControlState.normal)
} else {
audioPlayer?.pause()
self.playerButton.setImage(UIImage(named: "pause"), for: UIControlState.normal)
}
}
override func viewDidLoad() {
super.viewDidLoad()
horizontalSlider.minimumValue = 0
horizontalSlider.value = 0
self.playerButton.addTarget(self, action: #selector(PlayerViewController.playerButtonTapped), for: UIControlEvents.touchUpInside)
getAudio()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
NotificationCenter.default.addObserver(self, selector: #selector(PlayerViewController.finishedPlaying), name: NSNotification.Name.AVPlayerItemDidPlayToEndTime, object: self.audioPlayerItem)
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillAppear(animated)
// remove the timer
self.timer?.invalidate()
// remove the observer when leaving page
NotificationCenter.default.removeObserver(audioPlayer?.currentItem! as Any)
}
func finishedPlaying() {
// need option to play next track
self.playerButton.setImage(UIImage(named: "play"), for: UIControlState.normal)
let seconds : Int64 = 0
let preferredTimeScale : Int32 = 1
let seekTime : CMTime = CMTimeMake(seconds, preferredTimeScale)
audioPlayerItem!.seek(to: seekTime)
}
@IBAction func horizontalSliderActioned(_ sender: Any) {
horizontalSlider.isContinuous = true
if self.horizontalSlider.isTouchInside {
audioPlayer?.pause()
let seconds : Int64 = Int64(horizontalSlider.value)
let preferredTimeScale : Int32 = 1
let seekTime : CMTime = CMTimeMake(seconds, preferredTimeScale)
audioPlayerItem?.seek(to: seekTime)
audioPlayer?.play()
} else {
let duration : CMTime = (self.audioPlayer?.currentItem!.asset.duration)!
let seconds : Float64 = CMTimeGetSeconds(duration)
self.horizontalSlider.value = Float(seconds)
}
}
func audioSliderUpdate() {
let currentTime : CMTime = (self.audioPlayerItem?.currentTime())!
let seconds : Float64 = CMTimeGetSeconds(currentTime)
let time : Float = Float(seconds)
self.horizontalSlider.value = time
}
}