iOS Applications that play audio in background mode, can be controlled from remote control commands inside command center or the lock screen of device.
We will need to import MediaPlayer initially.
import MediaPlayer
And also player in our UIViewController subclass
var player: AVPlayer?
We will need setup function which can enable/disable remote commands
func setupRemoteCommandCenter(enable: Bool) { let remoteCommandCenter = MPRemoteCommandCenter.shared() if enable { remoteCommandCenter.pauseCommand.addTarget(self, action: #selector(remoteCommandCenterPauseCommandHandler)) remoteCommandCenter.playCommand.addTarget(self, action: #selector(remoteCommandCenterPlayCommandHandler)) remoteCommandCenter.stopCommand.addTarget(self, action: #selector(remoteCommandCenterStopCommandHandler)) remoteCommandCenter.togglePlayPauseCommand.addTarget(self, action: #selector(remoteCommandCenterPlayPauseCommandHandler)) } else { remoteCommandCenter.pauseCommand.removeTarget(self, action: #selector(remoteCommandCenterPauseCommandHandler)) remoteCommandCenter.playCommand.removeTarget(self, action: #selector(remoteCommandCenterPlayCommandHandler)) remoteCommandCenter.stopCommand.removeTarget(self, action: #selector(remoteCommandCenterStopCommandHandler)) remoteCommandCenter.togglePlayPauseCommand.removeTarget(self, action: #selector(remoteCommandCenterPlayPauseCommandHandler)) } remoteCommandCenter.pauseCommand.isEnabled = enable remoteCommandCenter.playCommand.isEnabled = enable remoteCommandCenter.stopCommand.isEnabled = enable remoteCommandCenter.togglePlayPauseCommand.isEnabled = enable }
This function will be called with true to enable
setupRemoteCommandCenter(enable: true)
And should be called with false in deinit to stop handling remote commands
deinit { setupRemoteCommandCenter(enable: false) }
And the actual function selectors to handle remote commands
func remoteCommandCenterPauseCommandHandler() { // handle pause player?.pause() } func remoteCommandCenterPlayCommandHandler() { // handle play player?.play() } func remoteCommandCenterStopCommandHandler() { // handle stop player?.pause() } func remoteCommandCenterPlayPauseCommandHandler() { // handle play pause if player?.rate == 0.0 { player?.play() } else { player?.pause() } }
We will need setup player function
func setupPlayer() { let streamURL = URL(string: "https://audio.stream.m3u8")! self.player = AVPlayer(url: streamURL) self.player?.play() }
And in our example, we have a button selector function to call necessary code
@IBAction func playButtonHandler(btn: UIButton) { setupRemoteCommandCenter(enable: true) setupPlayer() }
Here is gist for the example
// https://hashaam.com/2017/07/19/handle-remote-control-commands/ | |
import UIKit | |
import MediaPlayer | |
class ViewController: UIViewController { | |
var player: AVPlayer? | |
func setupRemoteCommandCenter(enable: Bool) { | |
let remoteCommandCenter = MPRemoteCommandCenter.shared() | |
if enable { | |
remoteCommandCenter.pauseCommand.addTarget(self, action: #selector(remoteCommandCenterPauseCommandHandler)) | |
remoteCommandCenter.playCommand.addTarget(self, action: #selector(remoteCommandCenterPlayCommandHandler)) | |
remoteCommandCenter.stopCommand.addTarget(self, action: #selector(remoteCommandCenterStopCommandHandler)) | |
remoteCommandCenter.togglePlayPauseCommand.addTarget(self, action: #selector(remoteCommandCenterPlayPauseCommandHandler)) | |
} else { | |
remoteCommandCenter.pauseCommand.removeTarget(self, action: #selector(remoteCommandCenterPauseCommandHandler)) | |
remoteCommandCenter.playCommand.removeTarget(self, action: #selector(remoteCommandCenterPlayCommandHandler)) | |
remoteCommandCenter.stopCommand.removeTarget(self, action: #selector(remoteCommandCenterStopCommandHandler)) | |
remoteCommandCenter.togglePlayPauseCommand.removeTarget(self, action: #selector(remoteCommandCenterPlayPauseCommandHandler)) | |
} | |
remoteCommandCenter.pauseCommand.isEnabled = enable | |
remoteCommandCenter.playCommand.isEnabled = enable | |
remoteCommandCenter.stopCommand.isEnabled = enable | |
remoteCommandCenter.togglePlayPauseCommand.isEnabled = enable | |
} | |
deinit { | |
setupRemoteCommandCenter(enable: false) | |
} | |
func remoteCommandCenterPauseCommandHandler() { | |
// handle pause | |
player?.pause() | |
} | |
func remoteCommandCenterPlayCommandHandler() { | |
// handle play | |
player?.play() | |
} | |
func remoteCommandCenterStopCommandHandler() { | |
// handle stop | |
player?.pause() | |
} | |
func remoteCommandCenterPlayPauseCommandHandler() { | |
// handle play pause | |
if player?.rate == 0.0 { | |
player?.play() | |
} else { | |
player?.pause() | |
} | |
} | |
func setupPlayer() { | |
let streamURL = URL(string: "https://audio.stream.m3u8")! | |
self.player = AVPlayer(url: streamURL) | |
self.player?.play() | |
} | |
@IBAction func playButtonHandler(btn: UIButton) { | |
setupRemoteCommandCenter(enable: true) | |
setupPlayer() | |
} | |
} |
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