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AVAudioPlayerDelegate SwiftUI

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Working with iPadOS 14 Beta 3.

import Foundation
import SwiftUI
import AVFoundation

class AudioHandler: NSObject, ObservableObject, AVAudioPlayerDelegate {

    @Published var isPlaying: Bool = false {
        willSet {
            if newValue == true {
                playAudio()
            }
        }
    }

    var myAudioPlayer = AVAudioPlayer()
    var fileName = ""

    override init() {
        super.init()
        myAudioPlayer.delegate = self
    }

    func playAudio() {
        let path = Bundle.main.path(forResource: fileName, ofType:nil)!
        let url = URL(fileURLWithPath: path)

        do {
            myAudioPlayer = try AVAudioPlayer(contentsOf: url)
            myAudioPlayer.play()
        } catch {
            // couldn't load file :(
        }
    }

    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        print("Did finish Playing")
        isPlaying = false
    }
}

Usage

if audioHandler.isPlaying == false {

                            Button(action: {
                                audioHandler.fileName = event.fileName
                                audioHandler.isPlaying.toggle()

                                print("Button Tapped")
                            }) {
                                Image(systemName: "play.circle")
                                    .font(.largeTitle)
                                    .foregroundColor(Color.white)
                            }
                        }

Click on the button, it plays the audio file. The audioPlayerDidFinishPlaying is never called. Tested on the device. I have a similar class for SpeechSythesis, and the (speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance)) works fine. Is something up with AVAudioPlayerDelegate, or am I doing something wrong?

2      

Just in case you've not got this working yet, all you need to do is move the delegate assignment out of the initialiser until after myAudioPlayer is instantiated.

So :-

override init() {
        super.init()
        // not here: myAudioPlayer.delegate = self
    }

func playAudio() {
        let path = Bundle.main.path(forResource: fileName, ofType:nil)!
        let url = URL(fileURLWithPath: path)

        do {
            myAudioPlayer = try AVAudioPlayer(contentsOf: url)
            myAudioPlayer.delegate = self    // Add here (once myAudioPlayer is instantiated)
            myAudioPlayer.play()
        } catch {
            // couldn't load file :(
        }
    }

Apologies if there's a better way of assigning the delegate but this worked for me. G

2      

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