How to play audio in background with Swift?

Question

As you see I'm streaming an audio broadcast. But when I press the home button and exit the app streaming stops or I cannot hear. How can I continue streaming in background and listen it from lock screen?

ViewController.Swift

import UIKit import AVFoundation import MediaPlayer import GoogleMobileAds       class ViewController: UIViewController, GADInterstitialDelegate {              @IBOutlet weak var exitMapButton: UIButton!         @IBOutlet weak var radarMap: UIWebView!         var interstitial: GADInterstitial!         func createAndLoadInterstitial() -> GADInterstitial {             var interstitial = GADInterstitial(adUnitID: "adUnitID-XXXX")             interstitial.delegate = self             interstitial.loadRequest(GADRequest())             return interstitial         }                  func getAd(){             if (self.interstitial.isReady)             {                 self.interstitial.presentFromRootViewController(self)                 self.interstitial = self.createAndLoadInterstitial()             }         }         @IBOutlet weak var ataturkButton: UIButton!         @IBOutlet weak var sabihaButton: UIButton!         @IBOutlet weak var esenbogaButton: UIButton!         @IBOutlet weak var weatherButton: UIButton!         @IBOutlet weak var statusLabel: UILabel!         @IBOutlet weak var playButton: UIButton!         @IBOutlet weak var webViewButton: UIButton!         var googleBannerView: GADBannerView! override func viewDidLoad() {             super.viewDidLoad()         } class PlayerAv {             var audioLink: String?             var player: AVPlayer             init(link: String) {                 self.audioLink = link                 self.player = AVPlayer(URL: NSURL(string: link))             }         }         var myPlayer = PlayerAv(link: "http://somewebsite.com/abc.pls")         var setTowerState = ""                  @IBAction func sliderValueChanged(sender: UISlider) {             var currentValue = Float(sender.value)             println(currentValue)             myPlayer.player.volume = currentValue         }         @IBAction func getWeatherWindow(sender: AnyObject) {             UIApplication.sharedApplication().openURL(NSURL(string: "http://somewebpage.com")!)             println("Directed to weather page")         }         @IBAction func changeToAtaturk() {             myPlayer.player.pause()             myPlayer = PlayerAv(link: "http://somewebsite.com/abc.pls")             myPlayer.audioLink == ""             println("\(myPlayer.audioLink!)--a")             playButton.setTitle("Pause", forState: UIControlState.Normal)             myPlayer.player.play()             setTowerState = "ataturk"             statusLabel.text = "Status: Playing, LTBA"         }         @IBAction func changeToEsenboga() {             myPlayer.player.pause()             myPlayer = PlayerAv(link: "http://somewebsite.com/def.pls")             println("\(myPlayer.audioLink!)--a")             playButton.setTitle("Pause", forState: UIControlState.Normal)             myPlayer.player.play()             setTowerState = "esenboga"             statusLabel.text = "Status: Playing, LTAC"         }         @IBAction func changeToSabiha() {             myPlayer.player.pause()             myPlayer = PlayerAv(link: "http://somewebsite.com/efg.pls")             println("\(myPlayer.audioLink!)--a")             playButton.setTitle("Pause", forState: UIControlState.Normal)             myPlayer.player.play()             setTowerState = "sabiha"             statusLabel.text = "Status: Playing, LTFJ"         }         override func didReceiveMemoryWarning() {             super.didReceiveMemoryWarning()             // Dispose of any resources that can be recreated.         }         @IBAction func playButtonPressed(sender: AnyObject) {             toggle()         }         func toggle() {             if playButton.titleLabel?.text == "Play" {                 playRadio()                 println("Playing")                 statusLabel.text = "Status: Playing"             } else {                 pauseRadio()                 println("Paused")                 statusLabel.text = "Status: Paused"             }         }         func playRadio() {             myPlayer.player.play()             playButton.setTitle("Pause", forState: UIControlState.Normal)            }         func pauseRadio() {             myPlayer.player.pause()             playButton.setTitle("Play", forState: UIControlState.Normal)         }     } 

Answer 1

You need to set your app Capabilities Background Modes (Audio and AirPlay) and set your AVAudioSession category to AVAudioSessionCategoryPlayback and set it active

From Xcode 11.4 • Swift 5.2

do {     try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default, options: [.mixWithOthers, .allowAirPlay])     print("Playback OK")     try AVAudioSession.sharedInstance().setActive(true)     print("Session is Active") } catch {     print(error) }