How to let background music continue?

Question

I want to allow a player to use their music in my game, so I want to know how to detect if the player is playing music from his music library so I can let his music continue playing and if not let my music play in the background.

I use this code to play music in my GameViewController:

let bgMusicURL: NSURL = NSBundle.mainBundle().URLForResource("Squart-GameMusic", withExtension: "wav")!

do {
    Data.GameMusic = try AVAudioPlayer(contentsOfURL: bgMusicURL, fileTypeHint: nil)
} catch {
    return print("no music file")
}

Data.GameMusic.numberOfLoops = 1
Data.GameMusic.prepareToPlay()
Data.GameMusic.play()

The problem is that when I try to play music from Music Library the sound stops and it lets my app play music instead of the Music Library.

Answer 1

Check whether the music is playing or not in the background like this

if MPMusicPlayerController.systemMusicPlayer().playbackState == .Playing {
    print("Music is playing")
} else {
    print("Play your music")
}

Don't forget to import:

import MediaPlayer

And if you want to play the sound simultaneously then use this code to play the sound file

func playSound {
    var soundID: SystemSoundID = 0
    let soundURL = CFBundleCopyResourceURL(CFBundleGetMainBundle(), "myFileName", "mp3", nil)
    AudioServicesCreateSystemSoundID(soundURL, &soundID)
    AudioServicesPlaySystemSound(soundID)
}