隐藏电池栏，遮罩层

- (BOOL)prefersStatusBarHidden
{

    return YES;//隐藏为YES，显示为NO
}

- (void)tapClick:(UITapGestureRecognizer *)sender {
    [self.imageView1 removeFromSuperview];
    [self.backgroundView removeFromSuperview];
}

//imageView1是二维码图片
-(void)downBtnClick{
    UIView *backgroundView = [[UIView alloc] init];
    self.backgroundView = backgroundView;
    backgroundView.frame = CGRectMake(0, 0,kScreenWidth,kSCreenHeight);
    backgroundView.backgroundColor = [UIColor colorWithRed:(40/255.0f) green:(40/255.0f) blue:(40/255.0f) alpha:1.0f];
    backgroundView.alpha = 0.7;
    backgroundView.userInteractionEnabled = YES;
    UITapGestureRecognizer *tap3 =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(tapClick:)];
    tap3.numberOfTapsRequired = 1;     // 点几下
    tap3.numberOfTouchesRequired = 1;  // 几根手指
    // 2.对某一个需要添加手势的view 添加手势
    [backgroundView addGestureRecognizer:tap3];
    [self.window addSubview:backgroundView];
    [self.window addSubview:self.imageView1];
}