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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:

iOS开发-音乐播放(AVAudioPlayer)

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~

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