How to add a delay to a sound being played with swift - ios

Question

I am a total swift beginner and am working on a tutorial project (magic 8 ball) and have been successful at doing the following:
- play a specific sound when the "Ask" button is pressed.
- play a specific sound when for each of the randomly picked images
However now the sound that should play whenever the button is pressed only plays once and from there on i only hear the sounds that are being displayed with each image. Is this because I am "stuck" in the "if - else" loop ? Or do I have to delay the sounds that are being played for each image in the array ?
Thanks so much for your help !
Here is my code:
import UIKit
import AVFoundation
class ViewController: UIViewController {
#IBOutlet weak var magicBall: UIImageView!
var magicBallDisplay = 1
var audioPlayer = AVAudioPlayer()
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
magicBall.image = #imageLiteral(resourceName: "theanswerisyes")
}
#IBAction func askButtonPressed(_ sender: UIButton) {
let magicBallArray = [ #imageLiteral(resourceName: "askagainlater"),#imageLiteral(resourceName: "no"),#imageLiteral(resourceName: "theanswerisyes"),#imageLiteral(resourceName: "yes"),#imageLiteral(resourceName: "noidea")]
magicBall.image = magicBallArray.randomElement()
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: "Ask", ofType: "wav")!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
}catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
if (magicBall.image?.isEqual(UIImage(named: "yes")))! {
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: "yes", ofType: "mp3")!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
} catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
else if (magicBall.image?.isEqual(UIImage(named: "no")))! {
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: "no", ofType: "mp3")!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
} catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
else if (magicBall.image?.isEqual(UIImage(named: "theanswerisyes")))! {
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: "theanswerisyes", ofType: "mp3")!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
} catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
else if (magicBall.image?.isEqual(UIImage(named: "noidea")))! {
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: "noidea", ofType: "mp3")!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
} catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
else if (magicBall.image?.isEqual(UIImage(named: "askagainlater")))! {
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: "askagainlater", ofType: "mp3")!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
} catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
}
}

Answer 1

I make a new project and change your code to this:
import UIKit
import AVFoundation
class ViewController: UIViewController {
#IBOutlet weak var magicBall: UIImageView!
// you never used this
//var magicBallDisplay = 1
var audioPlayer = AVAudioPlayer()
override func viewDidLoad() {
super.viewDidLoad()
magicBall.image = #imageLiteral(resourceName: "theanswerisyes")
}
#IBAction func askButtonPressed(_ sender: UIButton) {
// because you have audio file and image with equal name i made array of string
let magicBallArray = [ "yes","no","theanswerisyes","noidea","askagainlater"]
// check if i get not null item
guard let choosedImageName = magicBallArray.randomElement() else {return}
print(choosedImageName)
// set image with random picked name
magicBall.image = UIImage(named: choosedImageName)
// play ask sound
playSound(fileName: "Ask", fileType: "wav")
// play picked image sound after 10 second from now()
// change number to your needed time
DispatchQueue.main.asyncAfter(deadline: .now() + 10.0, execute: {
self.playSound(fileName: choosedImageName, fileType: "mp3")
})
}
private func playSound(fileName: String, fileType: String)
{
// check if you find the audio file
guard let url = Bundle.main.path(forResource: fileName, ofType: fileType) else {
print("path not found")
return
}
// make NSURL from path
let soundURL = NSURL(fileURLWithPath: url)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
} catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
}
I explain code for you.
I didn't enable the button. you can improve this code when you came stronger in swift

Answer 2

your code is really messy.
at first, I advise you to make a function for playing sound like that:
func playSound(fileName: String, fileType: String) {
let soundURL = NSURL(fileURLWithPath: Bundle.main.path(forResource: fileName, ofType: fileType)!)
do{
audioPlayer = try AVAudioPlayer(contentsOf: soundURL as URL)
}catch {
print("there was some error. The error was \(error)")
}
audioPlayer.play()
}
you must have a callback for first play sound. after finishing the first sound you can check your if-else or you can try switch-case.
also, you can use delay for playing second sound