iOS开发-音乐播放(AVAudioPlayer)

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iOS开发-音乐播放(AVAudioPlayer)

文艺小青年 2017-06-01 16:10:00 浏览565
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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

 

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