I'm writing a simple app for iOS and I'd like to be able to do some text to speech in it. I have a basic audio manager class with a "speak" function:
import Foundation
import AVFoundation
class AudioManager {
static let shared = AudioManager()
var audioPlayer: AVAudioPlayer?
var isPlaying: Bool {
return audioPlayer?.isPlaying ?? false
}
var playbackPosition: TimeInterval = 0
func playSound(named name: String) {
guard let url = Bundle.main.url(forResource: name, withExtension: "mp3") else {
print("Sound file not found")
return
}
do {
if audioPlayer == nil || !isPlaying {
audioPlayer = try AVAudioPlayer(contentsOf: url)
audioPlayer?.currentTime = playbackPosition
audioPlayer?.prepareToPlay()
audioPlayer?.play()
} else {
print("Sound is already playing")
}
} catch {
print("Error playing sound: \(error.localizedDescription)")
}
}
func stopSound() {
if let player = audioPlayer {
playbackPosition = player.currentTime
player.stop()
}
}
func speak(text: String) {
let synthesizer = AVSpeechSynthesizer()
let utterance = AVSpeechUtterance(string: text)
utterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
synthesizer.speak(utterance)
}
}
And my app shows text in a ScrollView:
ScrollView {
Text(self.description)
.padding()
.foregroundColor(.black)
.font(.headline)
.background(Color.gray.opacity(0))
}.onAppear {
AudioManager.shared.speak(text: self.description)
}
However, the text doesn't get read out (in the simulator). I see some output in the console:
Error fetching voices: Swift.DecodingError.dataCorrupted(Swift.DecodingError.Context(codingPath: [], debugDescription: "Invalid container metadata for _UnkeyedDecodingContainer, found keyedGraphEncodingNodeID", underlyingError: nil)). Using fallback voices.
I'm probably doing something wrong here, but not sure what.
Topic:
Media Technologies
SubTopic:
Audio