xcode - stop audio files from playing over each other - ios

Question

So I am new to xcode and programming in general. I am creating a simple soundboard and I am running into an issue. What I want to do is stop the current audio from playing when a different audio button is selected. Then have the stopped audio reset itself and be ready to start playing from the beginning when pressed again. I had added a stop() to my code and it would stop() the audio from playing but when I would try to restart it, I discovered that the audio just paused, and continued from the where it stopped.
Can anyone provide me with the code set that I need to fix this, and if not can anyone point me in the direction of a good tutorial that can lead me down the right path. I looked at the apple Audio documentation and unfortunately I got lost.
My code is as follows.
var SoundPlayer1:AVAudioPlayer = AVAudioPlayer()
var SoundPlayer2:AVAudioPlayer = AVAudioPlayer()
var SoundPlayer3:AVAudioPlayer = AVAudioPlayer()
override func viewDidLoad() {
super.viewDidLoad()
let FileLocation1 = Bundle.main.path(forResource: "Audio1", ofType: "mp3")
let FileLocation2 = Bundle.main.path(forResource: "Audio2", ofType: "mp3")
let FileLocation3 = Bundle.main.path(forResource: "Audio3", ofType: "mp3")
do {
SoundPlayer1 = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: FileLocation1!))
SoundPlayer2 = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: FileLocation2!))
SoundPlayer3 = try AVAudioPlayer(contentsOf: URL(fileURLWithPath: FileLocation3!))
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryAmbient)
try AVAudioSession.sharedInstance().setActive(true)
}
catch {
print(error)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func catButton(_ sender: AnyObject) {
SoundPlayer1.play()
}
#IBAction func pigButton(_ sender: AnyObject) {
SoundPlayer2.play()
}
#IBAction func pigButton(_ sender: AnyObject) {
SoundPlayer3.play()
}

Answer 1

This is just a bit of Swift logic you can carry out to check if any other of the players are playing and then stop them!
// Make sure all audio playback times are reset
func resetAllAudioTime(){
SoundPlayer1.currentTime = 0.0;
SoundPlayer2.currentTime = 0.0;
SoundPlayer3.currentTime = 0.0;
}
IBAction func catButton(_ sender: AnyObject) {
// Check SoundPlayer2 and stop if playing
if(SoundPlayer2.playing){
SoundPlayer2.pause();
}
// Check SoundPlayer3 and stop if playing
if(SoundPlayer3.playing){
SoundPlayer3.pause();
}
// Reset all playback times to start of file
resetAllAudioTime();
// Play audio file
SoundPlayer1.play()
}
#IBAction func pigButton(_ sender: AnyObject) {
// Check SoundPlayer1 and stop if playing
if(SoundPlayer1.playing){
SoundPlayer1.pause();
}
// Check SoundPlayer3 and stop if playing
if(SoundPlayer3.playing){
SoundPlayer3.pause();
}
// Reset all playback times to start of file
resetAllAudioTime();
// Play audio file
SoundPlayer2.play()
}
#IBAction func pigButton(_ sender: AnyObject) {
// Check SoundPlayer1 and stop if playing
if(SoundPlayer1.playing){
SoundPlayer1.pause();
}
// Check SoundPlayer2 and stop if playing
if(SoundPlayer2.playing){
SoundPlayer2.pause();
}
// Reset all playback times to start of file
resetAllAudioTime();
// Play audio file
SoundPlayer3.play()
}
Note: This code is untested but should work. See the AVAudioPlayer docs for any further help.
You will see that rather than calling the AVAudioPlayer.stop() method, I have used the AVAudioPlayer.pause() and then reset the playback time to the start. If you read the documentation it states calling the AVAudioPlayer.stop() method:
func stop()
Stops playback and undoes the setup needed for playback.
Therefore, calling pause and resetting the time doesn't keep undoing the setup needed for playback (should be more efficient!).
I hope this helps! :-)

Answer 2

WoodyDev, thank you for the info it was clean and easy to understand. I was able to fix my issue with two functions.
func stopAll() {
SoundPlayer1.stop()
SoundPlayer2.stop()
}
func resetAudioTime() {
SoundPlayer1.currentTime = 0.0;
SoundPlayer2.currentTime = 0.0;
}
#IBAction func catButton(_ sender: AnyObject) {
stopAll();<br/>
resetAudioTime();<br/>
SoundPlayer1.play()
}