- (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];}