动画效果隐藏和显示statusBar

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
    
    _isHidden = !_isHidden;
    
    [UIView animateWithDuration:0.5 animations:^{
        
        [self setNeedsStatusBarAppearanceUpdate];
    }];
    
}

- (UIStatusBarStyle)preferredStatusBarStyle {
    return UIStatusBarStyleLightContent;
}

// UIStatusBarAnimationFade: 慢慢变暗隐藏， UIStatusBarAnimationSlide: 向上滑动隐藏
- (UIStatusBarAnimation)preferredStatusBarUpdateAnimation {
    return UIStatusBarAnimationSlide;
}

- (BOOL)prefersStatusBarHidden {
    return _isHidden;
}

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