Make a playlist (start next song) in swift - ios

Question

I have created a sound player in swift with AVFoundation. I am trying to start the next song in array when the playing song is finished. I was trying to implement this code
if (audioPlayer.currentTime >= audioPlayer.duration){
var recentSong = songPlaylist[selectedSongNumber + 1]
audioPlayer = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath:
NSBundle.mainBundle().pathForResource(recentSong, ofType: "mp3")!), error: nil)
audioPlayer.play()
}
but I am not being able to implement this code (I do not know where to implement it).Here is my complete code
import UIKit
import AVFoundation
import AVKit
public var audioPlayer = AVPlayer()
public var selectedSongNumber = Int()
public var songPlaylist:[String] = ["song1", "song2"]
public var recentSong = "song1"
let playImage = UIImage(named: "Play.png") as UIImage!
let pauseImage = UIImage(named: "Pause.png") as UIImage!
class FirstViewController: UIViewController {
#IBOutlet weak var musicSlider: UISlider!
#IBOutlet weak var PlayPause: UIButton!
var audioPlayer = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath:
NSBundle.mainBundle().pathForResource(recentSong, ofType: "mp3")!), error: nil)
override func viewDidLoad() {
super.viewDidLoad()
musicSlider.maximumValue = Float(audioPlayer.duration)
var timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("updateMusicSlider"), userInfo: nil, repeats: true)
if (audioPlayer.currentTime >= audioPlayer.duration){
var recentSong = songPlaylist[selectedSongNumber + 1]
audioPlayer = AVAudioPlayer(contentsOfURL: NSURL(fileURLWithPath:
NSBundle.mainBundle().pathForResource(recentSong, ofType: "mp3")!), error: nil)
audioPlayer.play()
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func PlayPauseButton(sender: AnyObject) {
if (audioPlayer.playing == false){
audioPlayer.play()
PlayPause.setImage(pauseImage, forState: .Normal)
}else{
audioPlayer.pause()
PlayPause.setImage(playImage, forState: .Normal)
}
}
#IBAction func StopButton(sender: AnyObject) {
audioPlayer.stop()
audioPlayer.currentTime = 0
PlayPause.setImage(playImage, forState: .Normal)
}
#IBAction func musicSliderAction(sender: UISlider) {
audioPlayer.stop()
audioPlayer.currentTime = NSTimeInterval(musicSlider.value)
audioPlayer.play()
}
func updateMusicSlider(){
musicSlider.value = Float(audioPlayer.currentTime)
}
}

Answer 1

I am updating my code with something different:
import UIKit
import AVFoundation
class ViewController: UIViewController, AVAudioPlayerDelegate {
var counter = 0
var song = ["1","2","3"]
var player = AVAudioPlayer()
#IBOutlet weak var musicSlider: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
musicSlider.value = 0.0
}
func updateMusicSlider(){
musicSlider.value = Float(player.currentTime)
}
#IBAction func playSong(sender: AnyObject) {
music()
}
#IBAction func sliderAction(sender: AnyObject) {
player.stop()
player.currentTime = NSTimeInterval(musicSlider.value)
player.play()
}
func music(){
var audioPath = NSBundle.mainBundle().pathForResource("\(song[counter])", ofType: "mp3")!
var error : NSError? = nil
player = AVAudioPlayer(contentsOfURL: NSURL(string: audioPath), error: &error)
musicSlider.maximumValue = Float(player.duration)
var timer = NSTimer.scheduledTimerWithTimeInterval(0.05, target: self, selector: Selector("updateMusicSlider"), userInfo: nil, repeats: true)
player.delegate = self
if error == nil {
player.delegate = self
player.prepareToPlay()
player.play()
}
}
func audioPlayerDidFinishPlaying(player: AVAudioPlayer!, successfully flag: Bool)
{
println("Called")
if flag {
counter++
}
if ((counter + 1) == song.count) {
counter = 0
}
music()
}
}
You can do it this way.
Hope It will help and HERE is sample project for more Info.

Answer 2

You need to implement AVAudioPlayerDelegate Protocol's method:
optional func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer!, successfully flag: Bool)
Documentation link
Play your next music item here.
But I will not recommend, since AVAudioPlayer can only play one item at a time. You need to instantiate again with another music item after completion. I will suggest you to use AVQueuePlayer. Detaled answer has been given here. Hope it helps!

Answer 3

I created a sound player in swift with AVFoundation. I used progressView to time the song and then when it hits 0.98743 it will update to the next song automatically this is the Github link: https://github.com/ryan-wlr/MusicPlayerIOS
func updateProgressView() {
if (progressView.progress > a.advanced(by: 0.98743)) {
audioPlayerDidFinishPlayeing()
}
if audioPlayer.isPlaying {
let progress = Float(audioPlayer.currentTime/audioPlayer.duration)
progressView.setProgress(progress, animated: true)
}
}