簡(jiǎn)單的音樂(lè)播放 導(dǎo)入AVFoundation.framework

- (void)viewDidLoad
{
    [super viewDidLoad];
 
    //路徑
    NSString* path = [[NSBundle mainBundle] pathForResource:@"xiguan" ofType:@"mp3"];
    //路徑->url
    NSURL* url = [NSURL fileURLWithPath:path];
     
    _player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
    //準(zhǔn)備播放
    [_player prepareToPlay];
    //支持變速
    _player.enableRate = YES;
    //峰值 平均值
    _player.meteringEnabled = YES;
}
 
//進(jìn)度
- (IBAction)proSlider:(id)sender{
    //當(dāng)前時(shí)間=總時(shí)間*slider.value;
    float currentTime = _player.duration * _proSlider.value;
    [_player setCurrentTime:currentTime];
}
//聲道
- (IBAction)panSlider:(id)sender{
    _player.pan = _panSlider.value;
}
//速度
- (IBAction)speedSlider:(id)sender{
    _player.rate = _speedSlider.value;
}
//聲音
- (IBAction)volSlier:(id)sender{
    _player.volume = _volSlider.value;
}
 
 
- (void)play:(id)sender{
    [_player play];
    //播放時(shí)候開(kāi)啟定時(shí)器
    _timer = [NSTimer scheduledTimerWithTimeInterval:1/60.0 target:self selector:@selector(refresh) userInfo:nil repeats:YES];
}
 
- (void)pause:(id)sender{
    [_player pause];
    //暫定的時(shí)候定時(shí)器失效
    [_timer invalidate];
}
 
- (void)refresh{
    //當(dāng)前時(shí)間/總時(shí)間
    float pro = _player.currentTime / _player.duration;
    [_proSlider setValue:pro animated:YES];
     
    //刷新峰值平均值
    [_player updateMeters];
    float peak = ([_player peakPowerForChannel:0] + 50) / 50;
    float ave = ([_player averagePowerForChannel:0] + 50) / 50;
    [_proV setProgress:peak animated:YES];
    [_proV2 setProgress:ave animated:YES];
}
 
 
/////播放系統(tǒng)聲音
 
SystemSoundID myAlertSound;
        NSURL *url = [NSURL URLWithString:@"/System/Library/Audio/UISounds/alarm.caf"];
        /*
         low_power.caf  alarm.caf  SentMessage.caf
         */
        AudioServicesCreateSystemSoundID((__bridge CFURLRef)(url), &myAlertSound);
        AudioServicesPlaySystemSound(myAlertSound);

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