“iOS音乐播放器实现代码完整版”是一篇关于在iOS平台上实现音乐播放器的完整教程，以下是该攻略的详细讲解：
1. 概述
本文将详细介绍在iOS平台开发一个完整的音乐播放器所需的代码实现步骤。我们将会使用Apple提供的AVFoundation框架来完成音频的播放、暂停、停止、快进、快退、调整音量等基本操作，并且在界面上展示当前音频的播放进度、歌曲信息、专辑封面等信息。
2. 准备工作
在开始之前，我们需要准备以下工作：
- Xcode开发环境
- 一份音频资源文件（可以是本地文件或者网络文件）
另外，我们还需要在项目中引入AVFoundation框架，并在代码中导入相关的头文件。
3. 实现过程
本教程将基于MVC架构来实现音乐播放器。具体实现步骤如下：
3.1 模型层
我们使用一个名为MusicModel的模型类来存储音频的相关信息，如歌曲名、歌手、专辑名、歌曲路径等。该类的部分代码如下：
class MusicModel {
var musicTitle: String // 歌曲名
var musicArtist: String // 歌手名
var musicAlbum: String // 专辑名
var musicPath: String // 歌曲文件路径
init(title: String, artist: String, album: String, path: String) {
self.musicTitle = title
self.musicArtist = artist
self.musicAlbum = album
self.musicPath = path
}
}
3.2 控制器层
3.2.1 播放控制器
我们使用一个名为MusicPlayerViewController的控制器来控制音乐的播放、暂停、停止、快进、快退、调整音量等操作。该控制器的部分代码如下：
class MusicPlayerViewController: UIViewController {
// 模型层
var musicModel: MusicModel?
// AVPlayer实例
private var player: AVPlayer?
override func viewDidLoad() {
super.viewDidLoad()
// 初始化AVPlayer实例
if let path = musicModel?.musicPath {
let url = URL(fileURLWithPath: path)
player = AVPlayer(url: url)
}
}
func play() {
player?.play()
}
func pause() {
player?.pause()
}
func stop() {
player?.pause()
player?.seek(to: CMTime.zero)
}
func fastForward() {
let currentTime = player?.currentTime()
let timeToAdd = CMTime(value: 15, timescale: 1)
player?.seek(to: currentTime! + timeToAdd)
}
func rewind() {
let currentTime = player?.currentTime()
let timeToSubtract = CMTime(value: 15, timescale: 1)
player?.seek(to: currentTime! - timeToSubtract)
}
func volume(_ value: Float) {
player?.volume = value
}
}
3.2.2 播放界面控制器
我们使用一个名为MusicPlayViewController的控制器来展示音乐的播放状态、歌曲封面、歌曲信息等，并且通过调用MusicPlayerViewController中的方法来实现音乐的播放、暂停、停止、快进、快退、调整音量等操作。该控制器的部分代码如下：
class MusicPlayViewController: UIViewController {
// 模型层
var musicModel: MusicModel?
// 控制器层
let musicPlayerVC = MusicPlayerViewController()
// 歌曲封面ImageView
let musicCoverImageView: UIImageView = {
let imageView = UIImageView()
imageView.translatesAutoresizingMaskIntoConstraints = false
imageView.image = UIImage(named: "default")
imageView.contentMode = .scaleAspectFit
imageView.clipsToBounds = true
return imageView
}()
// 歌曲信息UILabel
let musicInfoLabel: UILabel = {
let label = UILabel()
label.translatesAutoresizingMaskIntoConstraints = false
label.font = UIFont.systemFont(ofSize: 17)
label.textColor = .black
label.numberOfLines = 0
label.textAlignment = .center
return label
}()
override func viewDidLoad() {
super.viewDidLoad()
// 设置背景色
view.backgroundColor = .white
// 添加子视图
view.addSubview(musicCoverImageView)
view.addSubview(musicInfoLabel)
// 添加约束
musicCoverImageView.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
musicCoverImageView.centerYAnchor.constraint(equalTo: view.centerYAnchor, constant: -100).isActive = true
musicCoverImageView.widthAnchor.constraint(equalToConstant: 250).isActive = true
musicCoverImageView.heightAnchor.constraint(equalToConstant: 250).isActive = true
musicInfoLabel.topAnchor.constraint(equalTo: musicCoverImageView.bottomAnchor, constant: 20).isActive = true
musicInfoLabel.leadingAnchor.constraint(equalTo: view.leadingAnchor, constant: 20).isActive = true
musicInfoLabel.trailingAnchor.constraint(equalTo: view.trailingAnchor, constant: -20).isActive = true
// 更新UI界面
updateUI()
}
// 更新UI界面
func updateUI() {
if let model = musicModel {
musicCoverImageView.image = UIImage(named: model.musicAlbum)
musicInfoLabel.text = "\(model.musicTitle)\n\(model.musicArtist)\n\(model.musicAlbum)"
// 设置播放器的模型层
musicPlayerVC.musicModel = model
}
}
// 播放按钮的动作
@IBAction func playButtonAction(_ sender: UIButton) {
musicPlayerVC.play()
}
// 暂停按钮的动作
@IBAction func pauseButtonAction(_ sender: UIButton) {
musicPlayerVC.pause()
}
// 停止按钮的动作
@IBAction func stopButtonAction(_ sender: UIButton) {
musicPlayerVC.stop()
}
// 快进按钮的动作
@IBAction func fastForwardButtonAction(_ sender: UIButton) {
musicPlayerVC.fastForward()
}
// 快退按钮的动作
@IBAction func rewindButtonAction(_ sender: UIButton) {
musicPlayerVC.rewind()
}
// 音量调节的动作
@IBAction func volumeSliderAction(_ sender: UISlider) {
musicPlayerVC.volume(sender.value)
}
}
3.3 视图层
3.3.1 播放界面视图
我们使用一个名为MusicPlayView的视图来展示音乐播放器的界面，并通过调用MusicPlayViewController中的方法来实现音乐的播放、暂停、停止、快进、快退、调整音量等操作。该视图的部分代码如下：
class MusicPlayView: UIView {
// 模型层
var musicModel: MusicModel?
// 控制器层
var musicPlayVC: MusicPlayViewController?
// 播放按钮
let playButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("播放", for: .normal)
button.setTitleColor(.black, for: .normal)
button.addTarget(self, action: #selector(playButtonAction), for: .touchUpInside)
return button
}()
// 暂停按钮
let pauseButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("暂停", for: .normal)
button.setTitleColor(.black, for: .normal)
button.addTarget(self, action: #selector(pauseButtonAction), for: .touchUpInside)
return button
}()
// 停止按钮
let stopButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("停止", for: .normal)
button.setTitleColor(.black, for: .normal)
button.addTarget(self, action: #selector(stopButtonAction), for: .touchUpInside)
return button
}()
// 快进按钮
let fastForwardButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("快进", for: .normal)
button.setTitleColor(.black, for: .normal)
button.addTarget(self, action: #selector(fastForwardButtonAction), for: .touchUpInside)
return button
}()
// 快退按钮
let rewindButton: UIButton = {
let button = UIButton()
button.translatesAutoresizingMaskIntoConstraints = false
button.setTitle("快退", for: .normal)
button.setTitleColor(.black, for: .normal)
button.addTarget(self, action: #selector(rewindButtonAction), for: .touchUpInside)
return button
}()
// 音量调节滑块
let volumeSlider: UISlider = {
let slider = UISlider()
slider.translatesAutoresizingMaskIntoConstraints = false
slider.minimumValue = 0
slider.maximumValue = 1
slider.addTarget(self, action: #selector(volumeSliderAction), for: .valueChanged)
return slider
}()
override init(frame: CGRect) {
super.init(frame: frame)
// 添加子视图
addSubview(playButton)
addSubview(pauseButton)
addSubview(stopButton)
addSubview(fastForwardButton)
addSubview(rewindButton)
addSubview(volumeSlider)
// 添加约束
playButton.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
playButton.topAnchor.constraint(equalTo: topAnchor, constant: 20).isActive = true
pauseButton.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20).isActive = true
pauseButton.topAnchor.constraint(equalTo: playButton.bottomAnchor, constant: 20).isActive = true
stopButton.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20).isActive = true
stopButton.topAnchor.constraint(equalTo: playButton.bottomAnchor, constant: 20).isActive = true
fastForwardButton.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
fastForwardButton.topAnchor.constraint(equalTo: pauseButton.bottomAnchor, constant: 20).isActive = true
rewindButton.centerXAnchor.constraint(equalTo: centerXAnchor).isActive = true
rewindButton.topAnchor.constraint(equalTo: fastForwardButton.bottomAnchor, constant: 20).isActive = true
volumeSlider.leadingAnchor.constraint(equalTo: leadingAnchor, constant: 20).isActive = true
volumeSlider.trailingAnchor.constraint(equalTo: trailingAnchor, constant: -20).isActive = true
volumeSlider.bottomAnchor.constraint(equalTo: bottomAnchor, constant: -20).isActive = true
}
// 更新UI界面
func updateUI() {
if let model = musicModel {
// 设置控制器层的模型层
musicPlayVC?.musicModel = model
}
}
// 播放按钮的动作
@IBAction func playButtonAction(_ sender: UIButton) {
musicPlayVC?.playButtonAction(sender)
}
// 暂停按钮的动作
@IBAction func pauseButtonAction(_ sender: UIButton) {
musicPlayVC?.pauseButtonAction(sender)
}
// 停止按钮的动作
@IBAction func stopButtonAction(_ sender: UIButton) {
musicPlayVC?.stopButtonAction(sender)
}
// 快进按钮的动作
@IBAction func fastForwardButtonAction(_ sender: UIButton) {
musicPlayVC?.fastForwardButtonAction(sender)
}
// 快退按钮的动作
@IBAction func rewindButtonAction(_ sender: UIButton) {
musicPlayVC?.rewindButtonAction(sender)
}
// 音量调节的动作
@IBAction func volumeSliderAction(_ sender: UISlider) {
musicPlayVC?.volumeSliderAction(sender)
}
}
3.4 如何使用
我们在主视图控制器中创建一个名为MusicPlayView的实例，并将它添加到视图控制器的视图中。同时，我们还需要为该视图添加约束以使其能够正常显示。
3.4.1 示例一
在viewDidLoad方法中创建一个名为musicPlayView的实例，并将其添加到视图控制器的视图中：
class ViewController: UIViewController {
let musicPlayView = MusicPlayView()
override func viewDidLoad() {
super.viewDidLoad()
// 添加子视图
view.addSubview(musicPlayView)
// 添加约束
musicPlayView.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
musicPlayView.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
musicPlayView.topAnchor.constraint(equalTo: view.safeAreaLayoutGuide.topAnchor).isActive = true
musicPlayView.bottomAnchor.constraint(equalTo: view.safeAreaLayoutGuide.bottomAnchor).isActive = true
// 加载示例音乐
loadSampleMusic()
}
// 加载示例音乐
func loadSampleMusic() {
let path = Bundle.main.path(forResource: "sample", ofType: "mp3")!
let musicModel = MusicModel(title: "The Sound of Silence", artist: "Simon & Garfunkel", album: "The Graduate", path: path)
// 设置视图层的模型层
musicPlayView.musicModel = musicModel
// 设置控制器层的模型层
musicPlayView.musicPlayVC?.musicModel = musicModel
// 更新UI界面
musicPlayView.updateUI()
}
}
3.4.2 示例二
在故事板中拖拽一个名为MusicPlayView的视图，并将其与一个名为MusicPlayViewController的视图控制器关联。在MusicPlayViewController.swift文件中，添加以下代码：
class MusicPlayViewController: UIViewController {
@IBOutlet weak var musicPlayView: MusicPlayView!
var musicModel: MusicModel?
override func viewDidLoad() {
super.viewDidLoad()
// 更新UI界面
musicPlayView.updateUI()
}
// 视图出现时加载音乐
override func viewWillAppear(_ animated: Bool) {
guard let model = musicModel else { return }
// 设置视图层的模型层
musicPlayView.musicModel = model
// 设置控制器层的模型层
musicPlayView.musicPlayVC?.musicModel = model
}
@IBAction func playButtonAction(_ sender: UIButton) {
musicPlayView.musicPlayVC?.play()
}
@IBAction func pauseButtonAction(_ sender: UIButton) {
musicPlayView.musicPlayVC?.pause()
}
@IBAction func stopButtonAction(_ sender: UIButton) {
musicPlayView.musicPlayVC?.stop()
}
@IBAction func fastForwardButtonAction(_ sender: UIButton) {
musicPlayView.musicPlayVC?.fastForward()
}
@IBAction func rewindButtonAction(_ sender: UIButton) {
musicPlayView.musicPlayVC?.rewind()
}
@IBAction func volumeSliderAction(_ sender: UISlider) {
musicPlayView.musicPlayVC?.volume(sender.value)
}
}
在故事板中将MusicPlayView中的每一个按钮与MusicPlayViewController.swift文件中的相应方法进行关联即可。
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