iOS开发-音乐播放(AVAudioPlayer)

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
}

　　基本上最常用就这么多了，周末愉快~