Play audio Files （播放音频文件）

1。必须导入 

   #import <AVFoundation/AVFoundation.h> 

2。实现协议: <AVAudioPlayerDelegate>

e.g.

@property (nonatomic, strong)AVAudioPlayer *audioPlayer;

- (void)actionPlay {

    //为后续异步加载，使用并行全局队列

    dispatch_queue_t dispatchQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);    

    //加载本地音频资源  bundle -> file -> data ，因为有可能音频文件比较大，所以采用异步加载 

    dispatch_async(dispatchQueue, ^(void) {    

        NSBundle *mainBundle = [NSBundle mainBundle];       

        NSString *filePath = [mainBundle pathForResource:@"MySong" ofType:@"mp3"];       

        NSData   *fileData = [NSData dataWithContentsOfFile:filePath];        

        NSError  *error = nil;  

        /* 当模拟器有声音，真机无声音时 需在启动播放器之前 加上以下这一句 */

       [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];

        /* 初始化 音频播放器 */

        self.audioPlayer = [[AVAudioPlayer alloc] initWithData:fileData error:&error];

        if (self.audioPlayer != nil){

            /* 设置代理，启动 */

            self.audioPlayer.delegate = self;

            if ([self.audioPlayer prepareToPlay] &&  [self.audioPlayer play]){

                NSLog(@"Successfully started playing");

            } else {

                NSLog(@"Failed to play");

            }

        } else {

            NSLog(@"Failed to instantiate AVAudioPlayer");

        }

    });   

}

//可在结束播放时，释放（无论是正常停止，或是意外停止） 参数flag : 播放是否成功结束 

- (void)audioPlayerDidFinishPlaying:(AVAudioPlayer *)player  successfully:(BOOL)flag{    

    NSLog(@"Finished playing the song");

    if ([player isEqual:self.audioPlayer]){

        self.audioPlayer = nil;

    } else {

        /* 其它播放器不作处理 */

    }    

}

//被中断，如来电等

- (void)audioPlayerBeginInterruption:(AVAudioPlayer *)player{   

    /* Audio Session is interrupted. The player will be paused here */ 

}

- (void)audioPlayerEndInterruption:(AVAudioPlayer *)player withOptions:(NSUInteger)flags{    

    if (flags == AVAudioSessionInterruptionOptionShouldResume && player != nil){

        [player play];

    }   

}