VolumeControl.swift
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//
// VolumeControl.swift
// ALCameraViewController
//
// Created by Alex Littlejohn on 2016/03/26.
// Copyright © 2016 zero. All rights reserved.
//
import UIKit
import MediaPlayer
typealias VolumeChangeAction = (Float) -> Void
public class VolumeControl {
let changeKey = "AVSystemController_SystemVolumeDidChangeNotification"
lazy var volumeView: MPVolumeView = {
let view = MPVolumeView()
view.frame = CGRect(x: 0, y: 0, width: 1, height: 1)
view.alpha = 0.01
return view
}()
var onVolumeChange: VolumeChangeAction?
init(view: UIView, onVolumeChange: VolumeChangeAction?) {
self.onVolumeChange = onVolumeChange
configureInView(view)
do {
try AVAudioSession.sharedInstance().setActive(true)
NotificationCenter.default.addObserver(self, selector: #selector(volumeChanged), name: NSNotification.Name(rawValue: changeKey), object: nil)
} catch {
}
}
deinit {
try! AVAudioSession.sharedInstance().setActive(false)
NotificationCenter.default.removeObserver(self)
onVolumeChange = nil
volumeView.removeFromSuperview()
}
func configureInView(_ view: UIView) {
view.addSubview(volumeView)
view.sendSubview(toBack: volumeView)
}
@objc func volumeChanged() {
guard let slider = volumeView.subviews.filter({ $0 is UISlider }).first as? UISlider else { return }
let volume = AVAudioSession.sharedInstance().outputVolume
slider.setValue(volume, animated: false)
onVolumeChange?(volume)
}
}