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iOS开发-音乐播放(AVAudioPlayer)

日期：2017-05-31点击：409收藏

现在的手机的基本上没有人不停音乐的，我们无法想象在一个没有声音的世界里我们会过的怎么样，国内现在的主流的主流网易云音乐，QQ音乐，酷狗，虾米，天天基本上霸占了所有的用户群体，不过并没有妨碍大家对音乐的追求，乐流算是突围成功了，据说卖给QQ啦，有兴趣的可以看下。我们做不了那么高大上的就先做个简单的，最核心的就是播放，暂停，切歌，其他的基本上围绕这个修修补补锦上添花的，比如说歌曲名称，专辑，谁听了这首歌。。。铺垫的多了，直接看效果吧，三个按钮一个进度条:

初始化按钮:

     self .playButton=[[UIButton alloc]initWithFrame:CGRectMake(40, 100, 60, 30)]; 
     [ self .playButton setTitle:@ "播放"  forState:UIControlStateNormal]; 
     [ self .playButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 
     [ self .playButton.titleLabel setFont:[UIFont systemFontOfSize:14]]; 
     self .playButton.layer.borderColor=[UIColor blackColor].CGColor; 
     self .playButton.layer.borderWidth=1.0; 
     self .playButton.layer.cornerRadius=5.0; 
     [ self .playButton addTarget: self  action: @selector (playMusic:) forControlEvents:UIControlEventTouchUpInside]; 
     [ self .view addSubview: self .playButton]; 
      
      
      
     self .pauseButton=[[UIButton alloc]initWithFrame:CGRectMake(140, 100, 60, 30)]; 
     [ self .pauseButton setTitle:@ "暂停"  forState:UIControlStateNormal]; 
     [ self .pauseButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 
     [ self .pauseButton.titleLabel setFont:[UIFont systemFontOfSize:14]]; 
     self .pauseButton.layer.borderColor=[UIColor blackColor].CGColor; 
     self .pauseButton.layer.borderWidth=1.0; 
     self .pauseButton.layer.cornerRadius=5.0; 
     [ self .pauseButton addTarget: self  action: @selector (pauseMusic:) forControlEvents:UIControlEventTouchUpInside]; 
     [ self .view addSubview: self .pauseButton]; 
      
      
     self .switchButton=[[UIButton alloc]initWithFrame:CGRectMake(240, 100, 60, 30)]; 
     [ self .switchButton setTitle:@ "切歌"  forState:UIControlStateNormal]; 
     [ self .switchButton setTitleColor:[UIColor blackColor] forState:UIControlStateNormal]; 
     [ self .switchButton.titleLabel setFont:[UIFont systemFontOfSize:14]]; 
     self .switchButton.layer.borderColor=[UIColor blackColor].CGColor; 
     self .switchButton.layer.borderWidth=1.0; 
     self .switchButton.layer.cornerRadius=5.0; 
     [ self .switchButton addTarget: self  action: @selector (switchMusic:) forControlEvents:UIControlEventTouchUpInside]; 
     [ self .view addSubview: self .switchButton]; 
 
  

初始化进度条:

     self .progressView=[[UIProgressView alloc]initWithFrame:CGRectMake(40, 180, 200, 50)]; 
    [ self .view addSubview: self .progressView];

AVAudioPlayer可以看成一个简易播放器，支持多种音频格式，能够进行进度、音量、播放速度等控制，已经满足了基本需求，接下来是播放音乐的代码:

     if  ( self .audioPlayer.isPlaying) { 
       [ self .audioPlayer pause]; 
   } else { 
       [ self  loadMusicByAsset:[[AVURLAsset alloc] initWithURL:[[ NSBundle  mainBundle] URLForResource:@ "我最亲爱的"  withExtension:@ "mp3" ] options: nil ]]; 
       [ self .audioPlayer play]; 
   } 
 
  

实例化AVAudioPlayer:

     -( void )loadMusicByAsset:(AVURLAsset*)avUrlAsset { 
       
      if  ([[ NSFileManager  defaultManager] fileExistsAtPath:avUrlAsset.URL.path]){ 
          NSError  *error= nil ; 
          self .audioPlayer= [[AVAudioPlayer alloc] initWithContentsOfURL:avUrlAsset.URL error:&error]; 
          self .audioPlayer.delegate= self ; 
          //准备buffer，减少播放延时的时间 
          [ self .audioPlayer prepareToPlay]; 
          [ self .audioPlayer setVolume:1];  //设置音量大小 
          self .audioPlayer.numberOfLoops =0; //设置播放次数，0为播放一次，负数为循环播放 
          if  (error) { 
              NSLog (@ "初始化错误:%@" ,error.localizedDescription); 
          } 
      } 
 } 
 
  

上面是通过AVURLAsset实例化的，还可以直接通过名称实例化:

     -( void )loadMusic:( NSString *)name { 
      NSString  *musicFilePath = [[ NSBundle  mainBundle] pathForResource:name ofType:@ "mp3" ];  //创建音乐文件路径 
       
      if  ([[ NSFileManager  defaultManager] fileExistsAtPath:musicFilePath]){ 
          NSURL  *musicURL = [[ NSURL  alloc] initFileURLWithPath:musicFilePath]; 
          NSError  *error= nil ; 
          self .audioPlayer= [[AVAudioPlayer alloc] initWithContentsOfURL:musicURL error:&error]; 
          self .audioPlayer.delegate= self ; 
          //准备buffer，减少播放延时的时间 
          [ self .audioPlayer prepareToPlay]; 
          [ self .audioPlayer setVolume:1];  //设置音量大小 
          self .audioPlayer.numberOfLoops =0; //设置播放次数，0为播放一次，负数为循环播放 
          if  (error) { 
              NSLog (@ "初始化错误:%@" ,error.localizedDescription); 
          } 
      } 
 } 
 
  

暂停音乐，这里为了方便单独写了一个按钮，大多数情况下，播放是暂停都是同一个按钮，仅供参考:

     -( void )pauseMusic:(UIButton *)sender{ 
      if  ( self .audioPlayer.isPlaying) { 
          [ self .audioPlayer pause]; 
      } 
 } 
 
  

切歌就是通常大家点的上一曲下一曲，很好理解:

     -( void )switchMusic:(UIButton *)sender{ 
      [ self .audioPlayer stop]; 
      [ self  loadMusicByAsset:[[AVURLAsset alloc] initWithURL:[[ NSBundle  mainBundle] URLForResource:@ "我需要一美元"  withExtension:@ "mp3" ] options: nil ]]; 
      [ self .audioPlayer play]; 
 } 
 
  

通过timer实时更新进度条:

     self .timer = [ NSTimer  scheduledTimerWithTimeInterval:0.1 target: self 
                                                selector: @selector (changeProgress) 
                                                userInfo: nil  repeats: YES ]; 
 
  

进度更新:

     -( void )changeProgress{ 
      if  ( self .audioPlayer.isPlaying) { 
          self .progressView.progress = self .audioPlayer.currentTime/ self .audioPlayer.duration; 
      } 
 } 
 
  

效果如下:

音乐播放完成之后可以在AVAudioPlayerDelegate的代理方法里面根据业务场景执行自己安排:

     -( void )audioPlayerDidFinishPlaying:(AVAudioPlayer *)player successfully:( BOOL )flag{ 
 //     [self.timer invalidate];直接销毁，之后不可用，慎重考虑 
       
 //    [self.timer setFireDate:[NSDate date]]; //继续 
 //    [self.timer setFireDate:[NSDate distantPast]];//开启 
      [ self .timer setFireDate:[ NSDate  distantFuture]]; //暂停 
 } 
 
  