iOS 隐藏系统音量提示框

 

    一：

#import <MediaPlayer/MediaPlayer.h>

#import <AVFoundation/AVFAudio.h>

 

@property(nonatomic,strong)UISlider *sliderView;

@property(nonatomic,assign)NSIntegercurrentTime;

二.

隐藏系统音量提示框

- (void)viewDidLoad {

    [superviewDidLoad];

 

    self.view.backgroundColor = [UIColorredColor];

    

    MPVolumeView *volumeView = [[MPVolumeViewalloc] initWithFrame: CGRectZero];

    volumeView.clipsToBounds = YES;

    [self.viewaddSubview: volumeView];

        

    self.sliderView = [[UISlideralloc]init];

    self.sliderView.frame = CGRectMake(100, 100, 200, 10);

    self.sliderView.maximumValue = 1;

    self.sliderView.minimumValue = 0;

//    self.sliderView.backgroundColor = [UIColor blueColor];

    self.sliderView.tintColor = [UIColoryellowColor];

    self.sliderView.thumbTintColor = [UIColorclearColor];//隐藏滑块

    [self.viewaddSubview:self.sliderView];

 

    [selfsettingVolume];

}

三.

// 设置音量相关

- (void)settingVolume {

    //监听系统音量变化

    AVAudioSession *session = [AVAudioSessionsharedInstance];

    [session setCategory:AVAudioSessionCategoryAmbienterror:nil];

    [session setActive:YESerror:nil];

    NSError *error;

    [[AVAudioSessionsharedInstance] setActive:YESerror:&error];

    [[UIApplicationsharedApplication] beginReceivingRemoteControlEvents];

    [[NSNotificationCenterdefaultCenter] addObserver:selfselector:@selector(volumeChangeNotification:)name:@"AVSystemController_SystemVolumeDidChangeNotification"object:nil];

}

  
// 音量改变

- (void)volumeChangeNotification:(NSNotification *)noti {

    if (self.sliderView.alpha == 0.0) {

        [UIViewanimateWithDuration:0.25animations:^{

            self.sliderView.alpha = 1.0;

        }];

    }

    float volume = [[[noti userInfo] objectForKey:@"AVSystemController_AudioVolumeNotificationParameter"] floatValue];

    self.sliderView.value = volume;

    self.currentTime = [NSDatedate].timeIntervalSince1970;

    // 两秒后消失

    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2.0 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

        NSTimeInterval nowTime = [NSDatedate].timeIntervalSince1970;

        // 容错处理，处理用户连续按音量加减时的情况

        if ((nowTime - self.currentTime) >= 2.0) {

            [UIViewanimateWithDuration:0.25animations:^{

                self.sliderView.alpha = 0.0;

            } ];

        }

    });

}