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iOS开发-音乐播放(AVAudioPlayer)

日期:2017-05-31点击:206

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:

 

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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:

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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:

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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:

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-( 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:

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-( 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:

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-( 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:

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-( 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:

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

进度更新:

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-( 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:

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-( 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
}

本文转自Fly_Elephant博客园博客,原文链接:http://www.cnblogs.com/xiaofeixiang/p/4540286.html,如需转载请自行联系原作者

 

原文链接:https://yq.aliyun.com/articles/364109
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