//獲得當(dāng)前屏幕亮度  light = [UIScreen mainScreen].brightness;  light = 0.5f;  //直接賦值或者使用set方法皆可  [UIScreen mainScreen].brightness = light;

MPMusicPlayerController *mpVC = [MPMusicPlayerController applicationMusicPlayer];//獲得系統(tǒng)當(dāng)前音量voice = _mpVC.volume;voice = 0.5f;//改變系統(tǒng)音量_mpVC.volume = voice;

- (void)leftSwipGes:(UIPanGestureRecognizer *)leftSwip{  //滑動(dòng)方法獲取到當(dāng)前位置的y坐標(biāo)  leftCurrentY = [leftSwip translationInView:leftView].y;  NSLog(@"left");  //當(dāng)前坐標(biāo)大于上一次移動(dòng)的坐標(biāo)，為向下滑動(dòng)  if (leftCurrentY > leftLastY) {    if (light > 0) {      //向下滑動(dòng)屏幕變暗，亮度下降      light = light - 0.01;    }    else{      //當(dāng)亮度為0時(shí)固定為0，禁止為負(fù)值      light = 0;    }  }  else  {    if (light < 1) {      //向上滑動(dòng)亮度增加      light = light + 0.01;    }    else{      //當(dāng)亮度為1時(shí)固定為1，禁止大于1      light = 1;    }  }  //設(shè)置屏幕亮度  [UIScreen mainScreen].brightness = light;  //當(dāng)前位置的上一次移動(dòng)的位置y坐標(biāo)  leftLastY = leftCurrentY;}//此處除參數(shù)外原理一樣，不再額外注釋- (void)rightSwipGes:(UIPanGestureRecognizer *)rightSwip{  NSLog(@"right");  rightCurrentY = [rightSwip translationInView:rightView].y;  if (rightCurrentY > rightLastY) {    if (voice > 0) {      voice = voice - 0.01;    }    else{      voice = 0;    }  }  else  {    if (voice < 1) {      voice = voice + 0.01;    }    else{      voice = 1;    }  }  //設(shè)置系統(tǒng)音量  _mpVC.volume = voice;  rightLastY = rightCurrentY;}

//從budle路徑下讀取音頻文件,這個(gè)文件名是你的歌曲名字,mp3是你的音頻格式  NSString *string = [[NSBundle mainBundle] pathForResource:@"夜空中最亮的星" ofType:@"mp3"];  NSString *playUrl = [string stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]; //轉(zhuǎn)碼成UTF-8 否則可能會(huì)出現(xiàn)錯(cuò)誤  //把音頻文件轉(zhuǎn)換成url格式  NSURL *url = [NSURL URLWithString:playUrl];  //初始化音頻類 并且添加播放文件  _avAudioPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];  [[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];  //設(shè)置初始音量大小  _avAudioPlayer.volume = voice;  //設(shè)置音樂播放次數(shù) -1為一直循環(huán)  _avAudioPlayer.numberOfLoops = -1;  //預(yù)播放  [_avAudioPlayer prepareToPlay];  [_avAudioPlayer play];

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