iOS簡單的音樂播放 聲音播放

簡單的音樂播放 導入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];
//準備播放
[_player prepareToPlay];
//支持變速
_player.enableRate = YES;
//峰值 平均值
_player.meteringEnabled = YES;

}
//進度

(IBAction)proSlider:(id)sender{
  //當前時間=總時間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];
  //播放時候開啟定時器
  _timer = [NSTimer scheduledTimerWithTimeInterval:1/60.0 target:self selector:@selector(refresh) userInfo:nil repeats:YES];
}

(void)pause:(id)sender{
  [_player pause];
  //暫定的時候定時器失效
  [_timer invalidate];
}

(void)refresh{
  //當前時間/總時間
  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);</pre>