How to play sound after each network request is successful? - swift

Question

I want to play a sound after each network request is successful. I have some objects that I want to send to the server using a for loop. In each iteration I'm sending a request to the server and after each request is complete, I want to play a sound.
I've tried this:
for object in objects {
sendObjectToServer(object)
}
func playSound() {
let url = Bundle.main.url(forResource: "sound", withExtension: "mp3")!
let player = try! AVAudioPlayer(url)
player.play()
}
func sendObjectToServer(object: Object) {
URLSession.shared.dataTask(with url: object.url) {(data,response,error) in
DispatchQueue.main.async {
playSound() // doesn't play sound synchronously
}
}
}

Answer 1

Why are you using the main thread for background-related operations. Only update your UI in the Dispatch.main.async code:
Try this on a physical device (tested and worked)
import AVFoundation
for object in objects {
DispatchQueue.global(qos: .background).async {
sendObjectToServer(object)
}
}
var player: AVAudioPlayer?
func playSound() {
guard let url = Bundle.main.url(forResource: "sound", withExtension: "mp3") else { return }
do {
try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
try AVAudioSession.sharedInstance().setActive(true)
/* The following line is required for the player to work on iOS 11. Change the file type accordingly*/
player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.mp3.rawValue)
/* iOS 10 and earlier require the following line:
player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileTypeMPEGLayer3) */
guard let player = player else { return }
player.play()
} catch let error {
print(error.localizedDescription)
}
}
func sendObjectToServer(object: Object) {
URLSession.shared.dataTask(with url: object.url) {(data,response,error) in
// Custom Logic
playSound()
}
}