How to prevent song item to start over again after being selected? - swift

Question

I have a collection view, that has a few songs, and upon selecting these songs, the app moves into a playerVC where the pause button is and the song image.
If the user selects song a for example, the music starts so "player.play()" is true, and then the user is moved into a playerVC with it's image etc, now say the user leaves this playerVC and wants to return to it to pause the song, the whole song restarts. How can I prevent this from happening? I know I have to implement an If statement to do something is "player.isPlaying" but do not know what to put in it.
This is the class where the audio is initialised
class SoundManager {
public var position = 0
public var songs: [Song] = []
var player: AVAudioPlayer?
func playNavPlayer() {
let song = songs[position]
let urlString = Bundle.main.path(forResource: song.trackName, ofType: "mp3")
do {
try AVAudioSession.sharedInstance().setMode(.default) ///app needs to know what mode we are working on
try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation)
guard let urlString = urlString else { return }
player = try AVAudioPlayer(contentsOf: URL(string: urlString)!)
guard let player = player else {return}
player.volume = 0.5
// player.play()
// player.delegate = self
player.numberOfLoops = -1
} catch {
print ("Error")
}
}
}
Updated Singleton Class
class SoundManager {
private init(){ }
static let shared = SoundManager()
public var position = 0
public var songs: [Song] = []
var player: AVAudioPlayer?
var songURL: URL!
func playNavPlayer() {
let song = songs[position]
let urlString = Bundle.main.path(forResource: song.trackName, ofType: "mp3")
do {
try AVAudioSession.sharedInstance().setMode(.default) ///app needs to know what mode we are working on
try AVAudioSession.sharedInstance().setActive(true, options: .notifyOthersOnDeactivation)
guard let urlString = urlString else { return }
player = try AVAudioPlayer(contentsOf: URL(string: urlString)!)
guard let player = player else {return}
player.volume = 0.5
player.play()
//player.delegate = self
player.numberOfLoops = -1
}
catch {
print ("Error")
}
}
How this class is called
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
collectionView.deselectItem(at: indexPath, animated: true)
//present player
let position = indexPath.item
guard let vc = storyboard?.instantiateViewController(identifier: "player") as? PlayerViewController else {
return
}
func push() {
vc.songs = songs
vc.position = position
vc.soundManager = SoundManager.shared
navigationController?.pushViewController(vc, animated: true)
}
SoundManager.shared.songs = songs
SoundManager.shared.position = position
if SoundManager.shared.player?.isPlaying == true && SoundManager.shared.player?.url (This is where I need to see compare song playing with song clicked) {
push()
}
else {
SoundManager.shared.playNavPlayer()
push()
}
SoundManager.shared.setupRemoteTransportControls()
SoundManager.shared.setupNowPlaying()
//songs
}
Song Declaration
var songs = [Song]()
func configureSongs() {
songs.append(Song(name: "Empire", imageName: "cover1", trackName: "Empire"))
songs.append(Song(name: "FirstSample", imageName: "cover2", trackName: "FirstSample"))
songs.append(Song(name: "TBH", imageName: "cover3", trackName: "TBH"))
songs.append(Song(name: "Trials", imageName: "cover4", trackName: "Trials"))
songs.append(Song(name: "Magic Spells", imageName: "cover5", trackName: "MagicSpells"))
songs.append(Song(name: "Still Goin", imageName: "cover6", trackName: "StillGoin"))
}
Song, is a struct
import Foundation
struct Song {
let name: String
let imageName: String
let trackName: String
}

Answer 1

So the Song struct should conform the Equatable protocol, in order for us to use a function in which we compare two instances of our Song struct, like this
struct Song: Equatable {
let name: String
let imageName: String
let trackName: String
static func == (lhs: Self, rhs: Self) -> Bool {
return lhs.trackName == rhs.trackName
}
}
And then when we select a song(item) in didSelect we implement an if function to check wether the player is playing and also to compare the two track names, the one that is playing and the one we just clicked on, then if true we specify what we want to do in the curly brackets.
if SoundManager.shared.player?.isPlaying == true && songs[position] == SoundManager.shared.songs[SoundManager.shared.position] {
//Whatever you want to do
}