iOS开发 自定义窗口 以及 点击scrollView置顶

 

static UIWindow *topWindow_;

static UIScrollView *scrollView_;

 

/**

 * 显示顶部窗口

 */

+ (void)show

{

  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(0.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{

    topWindow_ = [[UIWindow alloc] init];

    topWindow_.windowLevel = UIWindowLevelAlert;

    topWindow_.frame = CGRectMake(60, 0, fView_Width(kWindow), 20);

    topWindow_.backgroundColor = [UIColor clearColor];

    topWindow_.hidden = NO;

    [topWindow_ addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(topWindowClick)]];

  });

}

 

/**

 * 监听顶部窗口点击

 */

+ (void)topWindowClick

{

  UIWindow *keyWindow = [UIApplication sharedApplication].keyWindow;

  [self searchAllScrollViewsInView:keyWindow];

}

 

/**

 * 找到参数view中所有的UIScrollView

 */

+ (void)searchAllScrollViewsInView:(UIView *)view

{

  // 递归遍历所有的子控件

  for (UIView *subview in view.subviews) {

    [self searchAllScrollViewsInView:subview];

  }

  

  // 判断子控件类型(如果不是UIScrollView，直接返回)

  if (![view isKindOfClass:[UIScrollView class]]) return;

  

  // 找到了UIScrollView

  UIScrollView *scrollView = (UIScrollView *)view;

    

  // 让UIScrollView滚动到最前面

  // 让CGRectMake(0, 0, 1, 1)这个矩形框完全显示在scrollView的frame框中

//  [scrollView scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:YES];

  if (scrollView == scrollView_) {

    [scrollView setContentOffset:CGPointMake(scrollView.contentOffset.x, -scrollView.contentInset.top) animated:YES];

  }

}

 

+ (void)configScrollView:(UIScrollView *)scrollView {

  scrollView_ = scrollView;

}