82 lines
2.6 KiB
Swift
82 lines
2.6 KiB
Swift
//
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// MPVolumeManager.swift
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// MusicPlayer
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//
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// Created by Mr.Zhou on 2024/3/29.
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//
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import Foundation
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import UIKit
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import MediaPlayer
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import AVFoundation
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///音量控制器（获取修改系统音量）
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class MPVolumeManager:NSObject {
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static let shared = MPVolumeManager()
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//系统音量控制View
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private var volumeView:MPVolumeView?
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//自定义渐变色Slider
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private var systemVolumeSlider: UISlider?
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private override init() {
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super.init()
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//为音频会话添加KVO监听
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AVAudioSession.sharedInstance().addObserver(self, forKeyPath: "outputVolume", options: [.old, .new], context: nil)
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}
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deinit {
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//移除所有监听
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AVAudioSession.sharedInstance().removeObserver(self, forKeyPath: "outputVolume")
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}
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//重新持有系统volum控制器
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func createVolume() {
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volumeView = .init()
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// 添加音量视图到界面，但隐藏它
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volumeView!.frame = CGRect(x: -100, y: -100, width: 0, height: 0)
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UIApplication.shared.windows.first?.addSubview(volumeView!)
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// 查找系统音量滑块
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for view in volumeView!.subviews {
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if let slider = view as? UISlider {
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systemVolumeSlider = slider
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break
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}
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}
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}
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//销毁系统volum控制器
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func destroyVolume() {
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guard volumeView != nil else {
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return
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}
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volumeView!.removeFromSuperview()
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systemVolumeSlider = nil
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volumeView = nil
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}
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//设置系统音量
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func setVolume(_ volume: Float) {
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systemVolumeSlider?.setValue(volume, animated: false)
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}
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//获取系统音量
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func getVolume() -> Float {
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//获取AVAudioSession
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getSystemVolume()
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}
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//获取系统音量
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private func getSystemVolume() -> Float{
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let audioSession = AVAudioSession.sharedInstance()
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do {
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try audioSession.setActive(true)
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return audioSession.outputVolume
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} catch {
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print("Error getting system volume: \(error.localizedDescription)")
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return 0.0
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}
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}
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//KVO
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override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
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if keyPath == "outputVolume" {
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if let volume = change?[.newKey] as? Float {
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//将获得volume值通知传出
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NotificationCenter.notificationKey.post(notificationName: .volume_change, object: volume)
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}
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}
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}
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}
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