音乐播放器

• 对于这个音乐播放器我只实现了播放 暂停 下一曲 上一曲 停止 音量加减 和从歌曲列表中选歌并播放的功能 更多功能 欢迎大家参考我的代码 进行修改，代码中有些不妥地方，还望各位大神指出。

整体界面搭建出来 是这个样子:

这个是播放列表的样子 我把它做成半透明的样式;

• 当你画了一个控件 点击右上角的辅助编辑器 你可以使用按住Ctrl 加鼠标左键 拖到你的编辑器 然后为你的控件取名字. 当你想删除的时候 一定要点击storyBord 在你要删除的空间的上面 右键 然后点击叉叉 就可以删除与代码区的绑定 。如果要再次绑定只需要再次Ctrl加鼠标左键 拖过来.
  代码区：
  #import "ViewController.h"#import#define WIDTH self.view.bounds.size.width#define HEIGHT self.view.bounds.size.height@interface ViewController (){
  AVAudioPlayer *MyPlayer;//不能做成局部变量
  NSTimer *timer;
  NSMutableArray *songs;
  NSUInteger myindex;
  UIStepper *volumeStepper;
  int index1;
  UIView *view;
  UITableView *myTableView;
  NSMutableArray *dataArray;
  }
  @property (weak, nonatomic) IBOutlet UILabel *albumLabel;
  @property (weak, nonatomic) IBOutlet UILabel *artistLabel;
  @property (weak, nonatomic) IBOutlet UILabel *titleLabel;
  @property (weak, nonatomic) IBOutlet UIImageView *coverImageView;
  @property (weak, nonatomic) IBOutlet UIProgressView *playProgressView;
  @end
  @implementation ViewController
  -(void)dealloc{
  if (timer) {
  [timer invalidate];
  timer = nil;
  }
  }
  - (void)viewDidLoad {
  [super viewDidLoad];
  myindex = 1;
  _playProgressView.progress = 0;
  songs = [NSMutableArray arrayWithObjects:@"月半小夜曲",@"后会无期",@"静静看着你",@"李白",@"喜欢你",@"Taylor Swift - Love Story (International Radio Mi", nil];
  _coverImageView.layer.cornerRadius = 100;
  _coverImageView.clipsToBounds = YES;
  NSString *filename = [[NSBundle mainBundle] pathForResource:@"李白" ofType:@"mp3"];
  //拿到mp3
  // NSString *filename = [[NSBundle mainBundle] pathForResource:@"后会无期" ofType:@"mp3"];
  NSURL *fileUrl = [NSURL fileURLWithPath:filename];
  //先拿到文件 才能拿到数据 才能刷新
  [self updateUI:fileUrl];
  MyPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileUrl error:nil];
  //设置支持后台播放后台播放
  //获得当前音频会话对象的单例
  AVAudioSession audioSession = [AVAudioSession sharedInstance];
  [audioSession setActive:YES error:nil];
  [audioSession setCategory:AVAudioSessionCategoryPlayback error:nil];
  //打开项目 capabilities---> background modes--- > 打开audio and airplay 设置支持后台播放
  //打开项目 capabilities---> background modes---> 打开remote notifications 设置支持耳机
  [[UIApplication sharedApplication]beginReceivingRemoteControlEvents];
  //声道
  // player.pan = -1;
  //音乐大小 0~1 最大值可以修改 是一种软修改
  //MyPlayer.volume = 1;
  //文件播放速率 用于快进 快退
  //player.enableRate = YES;
  //player.rate = 4;
  //跳过20s再播放
  //MyPlayer.currentTime = 270;
  MyPlayer.delegate = self;
  //文件缓存
  //[MyPlayer prepareToPlay];
  //播放音乐
  // [MyPlayer play];
  // progressSlider = [[UISlider alloc]initWithFrame:CGRectMake(65, 440, 245, 15)];
  // [progressSlider addTarget:self action:@selector(progressValueChange) forControlEvents:UIControlEventValueChanged];
  // [self.view addSubview:progressSlider];
  timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(progressChange) userInfo:nil repeats:YES];
  timer.fireDate = [NSDate distantFuture];
  #if 0
  volumeStepper = [[UIStepper alloc]initWithFrame:CGRectMake(WIDTH/3+15, 4HEIGHT/7, 30, 20)];
  [volumeStepper addTarget:self action:@selector(volumeChange:) forControlEvents:UIControlEventValueChanged];
  volumeStepper.minimumValue = 0;
  volumeStepper.maximumValue = 3;
  volumeStepper.stepValue = 1;
  //设置控制器背景图片
  volumeStepper.tintColor = [UIColor lightGrayColor];
  [self.view addSubview:volumeStepper];
  #endif
  view = [[UIView alloc]initWithFrame:CGRectMake(0, 0, 300, 270)];
  view.center = CGPointMake(WIDTH/2, HEIGHT/3);
  view.hidden = YES;
  view.alpha = 0.6;
  [self.view addSubview:view];
  myTableView = [[UITableView alloc]initWithFrame:CGRectMake(0, 0, view.bounds.size.width, view.bounds.size.height) style:UITableViewStylePlain];
  [view addSubview:myTableView];
  myTableView.dataSource = self;
  myTableView.delegate = self;
  [self loadDataModel];
  }
  -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CELL"];
  if (!cell) {
  cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"CELL"];
  cell.backgroundColor = [UIColor colorWithRed:85.88 green:71.78 blue:60.74 alpha:0.6];
  }
  //cell.backgroundView = nil;
  cell.contentView.backgroundColor = [UIColor colorWithRed:85.88 green:71.78 blue:60.74 alpha:0.6];
  [myTableView setSeparatorStyle:UITableViewCellSeparatorStyleNone];
  cell.opaque = NO;
  cell.textLabel.backgroundColor = [UIColor colorWithRed:85.88 green:71.78 blue:60.74 alpha:0.6];
  cell.textLabel.text = dataArray[indexPath.row];
  return cell;
  }
  -(NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
  return dataArray.count;
  }
  - (void)tableView:(UITableView *)tableView didSele ctRowAtIndexPath:(NSIndexPath *)indexPath{
  NSString *filename = [[NSBundle mainBundle] pathForResource:songs[indexPath.row] ofType:@"mp3"];
  NSURL *fileUrl = [NSURL fileURLWithPath:filename];
  [self updateUI:fileUrl];
  MyPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileUrl error:nil];
  MyPlayer.volume = 1;
  MyPlayer.delegate = self;
  [MyPlayer prepareToPlay];
  [MyPlayer play];
  view.hidden = YES;
  }
  -(void)loadDataModel{
  if (!dataArray) {
  dataArray = [NSMutableArray array];
  }
  dataArray = [NSMutableArray arrayWithObjects:@"月半小夜曲",@"后会无期",@"静静看着你",@"李白",@"喜欢你",@"Taylor Swift - Love Story (International Radio Mi", nil];
  }
  -(void)volumeChange:(UIStepper *)sender{
  MyPlayer.volume = sender.value;
  }
  //进度条改变的回调方法
  -(void)progressChange{
  _playProgressView.progress = MyPlayer.currentTime/MyPlayer.duration;
  [UIView animateWithDuration:8 animations:^{
  _coverImageView.transform = CGAffineTransformRotate(_coverImageView.transform, M_PI_4/5);
  }];
  }
  - (IBAction)volumeIncreaseButtonClicked:(UIButton *)sender {
  MyPlayer.volume += 1;
  if (MyPlayer.volume>4) {
  MyPlayer.volume = 4;
  }
  }
  - (IBAction)volumeDecreaseButtonClicked:(UIButton *)sender {
  MyPlayer.volume -= 1;
  if (MyPlayer.volume<0) {
  MyPlayer.volume = 0;
  }
  }
  //播放列表
  - (IBAction)MusicListButtonClicked:(UIButton *)sender {
  view.hidden = !view.hidden;
  }
  //播放结束
  -(void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:(BOOL)flag{
  index1 = arc4random()%6;
  if (index1!=myindex) {
  myindex = index1;
  }
  NSString *filename = [[NSBundle mainBundle] pathForResource:songs[myindex] ofType:@"mp3"];
  NSURL *fileUrl = [NSURL fileURLWithPath:filename];
  [self updateUI:fileUrl];
  MyPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileUrl error:nil];
  MyPlayer.volume = 1;
  MyPlayer.delegate = self;
  [MyPlayer prepareToPlay];
  [MyPlayer play];
  }
  //刷新界面 拿到歌的信息 刷新界面
  -(void)updateUI:(NSURL *)fileUrl{
  //代表和文件相关的数据
  AVURLAsset *assset = [[AVURLAsset alloc]initWithURL:fileUrl options:nil];
  //[assset availableMetadataFormats];//元数据的格式
  NSArray *metaDataItems =[assset metadataForFormat:[[assset availableMetadataFormats] firstObject]];
  for (AVMetadataItem *item in metaDataItems) {
  if ([item.commonKey isEqualToString:@"artist"]) {
  _artistLabel.text = [item.value description];
  }
  else if ([item.commonKey isEqualToString:@"title"]){
  _titleLabel.text = [item.value description];
  }
  else if ([item.commonKey isEqualToString:@"albumName"]){
  _albumLabel.text = [item.value description];
  }
  else if ([item.commonKey isEqualToString:@"artwork"]){
  _coverImageView.image = [UIImage imageWithData:(id)item.value];
  }
  }
  }
  - (IBAction)buttonClicked:(UIButton *)sender {
  if(MyPlayer.isPlaying){
  timer.fireDate = [NSDate distantFuture];
  [MyPlayer pause];
  //[sender setTitle:@"播放" forState:UIControlStateNormal] ;
  }
  else {
  timer.fireDate = [NSDate distantPast];
  [MyPlayer play];
  //[sender setTitle:@"暂停" forState:UIControlStateNormal];
  }
  }
  - (IBAction)prevButtonClicked:(UIButton *)sender {
  timer.fireDate = [NSDate distantPast];
  myindex --;
  if (myindex==0) {
  myindex = 5;
  }
  NSString *filename = [[NSBundle mainBundle] pathForResource:songs[myindex] ofType:@"mp3"];
  NSURL *fileUrl = [NSURL fileURLWithPath:filename];
  [self updateUI:fileUrl];
  MyPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileUrl error:nil];
  MyPlayer.volume = 1;
  MyPlayer.delegate = self;
  [MyPlayer prepareToPlay];
  [MyPlayer play];
  }
  - (IBAction)nextButtonClicked:(UIButton *)sender {
  timer.fireDate = [NSDate distantPast];
  myindex++;
  if (myindex>5) {
  myindex = 0;
  }
  NSString *filename = [[NSBundle mainBundle] pathForResource:songs[myindex] ofType:@"mp3"];
  NSURL *fileUrl = [NSURL fileURLWithPath:filename];
  [self updateUI:fileUrl];
  MyPlayer = [[AVAudioPlayer alloc]initWithContentsOfURL:fileUrl error:nil];
  MyPlayer.volume = 1;
  MyPlayer.delegate = self;
  [MyPlayer prepareToPlay];
  [MyPlayer play];
  }
  - (IBAction)stopButtonClicked:(UIButton *)sender {
  timer.fireDate = [NSDate distantFuture];
  [MyPlayer stop];
  MyPlayer.currentTime = 0;
  _playProgressView.progress = 0;
  }
  @end