iOS系统音量&屏幕亮度调节

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一，系统音量获取

系统框架

#import <AVFoundation/AVFoundation.h>
#import <MediaPlayer/MediaPlayer.h>
#import <AVKit/AVKit.h>

获取系统音量slider

- (MPVolumeView *)volumeView {
    if (_volumeView == nil) {
        _volumeView  = [[MPVolumeView alloc] init];
        [_volumeView sizeToFit];
#warning 获取系统的音量的UISlider
        for (UIView *view in [_volumeView subviews]){
            if ([view.class.description isEqualToString:@"MPVolumeSlider"]){
                self.volumeViewSlider = (UISlider*)view;
                break;
            }
        }
    }
    return _volumeView;
}

监听系统物理按键调节音量

/** 监听 */
- (void)registerVolumeChangeEvent {
//    NSError *error;
//    [[AVAudioSession sharedInstance] setActive:YES error:&error];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(changeVolumeValueFunc) name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];
}
/** 移除 */
- (void)unregisterVolumeChangeEvent {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:@"AVSystemController_SystemVolumeDidChangeNotification" object:nil];
}

获取系统当前音量

[[AVAudioSession sharedInstance] outputVolume];

二，屏幕亮度

很简单就一句

[[UIScreen mainScreen] setBrightness:值（0 ~ 1）]
//示例
            if (panPoint.y < 0) {
                //增加亮度
                [[UIScreen mainScreen] setBrightness:self.startVB + (-panPoint.y / 30.0 / 10)];
            } else {
                //减少亮度
                [[UIScreen mainScreen] setBrightness:self.startVB - (panPoint.y / 30.0 / 10)];
            }