IOS 手势音量控制

两种简单的实现系统音量的控制：

第一种

//获取系统音量

    MPVolumeView *volumeView = [[MPVolumeView alloc] init];

    volumeViewSlider = nil;

    for (UIView *view in [volumeView subviews]){

        if ([view.class.description isEqualToString:@"MPVolumeSlider"]){

            volumeViewSlider = (UISlider *)view;

            break;

        }

    }

    systemVolume = volumeViewSlider.value;

第二种
//获取系统音量

MPMusicPlayerController *mpc = [MPMusicPlayerController applicationMusicPlayer];

   systemVolume = mpc.volume;

代码如下：

@implementation JYMoviePlayerViewController

UISlider* volumeViewSlider;

float systemVolume;//系统音量值

CGPoint startPoint;//起始位置

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil

{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];

    if (self) {

        // Custom initialization

    }

    return self;

}

- (void)viewDidLoad

{

    [super viewDidLoad];

    

    //获取系统音量

    MPVolumeView *volumeView = [[MPVolumeView alloc] init];

    volumeViewSlider = nil;

    for (UIView *view in [volumeView subviews]){

        if ([view.class.description isEqualToString:@"MPVolumeSlider"]){

            volumeViewSlider = (UISlider *)view;

            break;

        }

    }
    systemVolume = volumeViewSlider.value;

}

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    if(event.allTouches.count == 1){

        //保存当前触摸的位置

        CGPoint point = [[touches anyObject] locationInView:self.view];

        startPoint = point;

    }

}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{

    

    if(event.allTouches.count == 1){

        //计算位移

        CGPoint point = [[touches anyObject] locationInView:self.view];

//        float dx = point.x - startPoint.x;

        float dy = point.y - startPoint.y;

        int index = (int)dy;

        if(index>0){

            if(index%5==0){//每10个像素声音减一格

                NSLog(@"%.2f",systemVolume);

                if(systemVolume>0.1){

                    systemVolume = systemVolume-0.05;

                    [volumeViewSlider setValue:systemVolume animated:YES];

                    [volumeViewSlider sendActionsForControlEvents:UIControlEventTouchUpInside];

                    //mpc.volume = systemVolume;

                }

            }

        }else{

            if(index%5==0){//每10个像素声音增加一格

                NSLog(@"+x ==%d",index);

                NSLog(@"%.2f",systemVolume);

                if(systemVolume>=0 && systemVolume<1){

                    systemVolume = systemVolume+0.05;

                    [volumeViewSlider setValue:systemVolume animated:YES];

                    [volumeViewSlider sendActionsForControlEvents:UIControlEventTouchUpInside];

                    //mpc.volume = systemVolume;

                }

            }

        }

        //亮度调节

        //        [UIScreen mainScreen].brightness = (float) dx/self.view.bounds.size.width;

    }

}