Download audio and play in AVAudioPlayer - swift

Question

I need download audio file and then play him. I wrote code for downloading, but I don't know how to transfer him to AVAudioPlayer.
#IBAction func downloadButton(_ sender: Any) {
if let audioUrl = URL(string: "https://www.dropbox.com/s/qwqxsde1yo5m1mz/Track04.mp3?dl=0") {
// then lets create your document folder url
let documentsDirectoryURL = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first!
// lets create your destination file url
let destinationUrl = documentsDirectoryURL.appendingPathComponent(audioUrl.lastPathComponent)
print(destinationUrl)
// to check if it exists before downloading it
if FileManager.default.fileExists(atPath: destinationUrl.path) {
print("The file already exists at path")
// if the file doesn't exist
} else {
let task = URLSession.shared.downloadTask(with: audioUrl) { (location, response, error) in
guard let location = location else {return}
do{
try FileManager.default.moveItem(at: location ,to : destinationUrl)
print("File moved to documents folder")
}
catch {
print("error")
}
}
task.resume()
}
}
}
#IBAction func playAudio(_ sender: Any) {
????????
}

Answer 1

Just create AVAudioPlayer instance with local file url like below:
if FileManager.default.fileExists(atPath: destinationUrl.path) {
do {
self.player = try AVAudioPlayer(contentsOfURL: destinationUrl)
player.prepareToPlay()
player.volume = 1
player.play()
} catch {
print(error)
}
}

Answer 2

use your destintionUrl to get music file data from documentDirectory and then assign data to player object.
func playSongUsing(_ url : URL) {
do {
try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
try AVAudioSession.sharedInstance().setActive(true)
// For iOS 11
objPlayer = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.mp3.rawValue)
// For iOS versions < 11
objPlayer = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileTypeMPEGLayer3)
guard let aPlayer = objPlayer else { return }
aPlayer.play()
} catch let error {
print(error.localizedDescription)
}
}