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];
}

// 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;
            } ];
        }
    });
}