滚动时，使UIScrollView中的UIView粘到顶部

问题描述

因此，在UITableView中，当您有截面时，截面视图会粘到顶部，直到下一部分与其重叠，然后将其替换为顶部。我希望有一个类似的效果，基本上我在UIScrollView中有一个UIView，表示UIView部分以及它何时触及顶部..我希望它留在那里而不是被占用。我该怎么做呢？我认为这需要在layoutSubviews或scrollViewDidScroll中完成并对UIVIew进行操作..

So in a UITableView when you have sections the section view sticks to the top until the next section overlaps it and then it replaces it on top. I want to have a similar effect, where basically I have a UIView in my UIScrollView, representing the sections UIView and when it hits the top.. I want it to stay in there and not get carried up. How do I do this? I think this needs to be done in either layoutSubviews or scrollViewDidScroll and do a manipulation on the UIVIew..

推荐答案

创建UIView in向上滚动时UIScrollView会粘到顶部：

To create UIView in UIScrollView stick to the top when scrolled up do:

- (void)createHeaderView:(UIView*)headerView {
    _headerView = [headerView retain];
    _headerViewInitialY = _headerView.frame.origin.y;
    [_scrollView addSubview:_headerView];
    _scrollView.delegate = self;
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    CGRect headerFrame = _headerView.frame;
    headerFrame.origin.y = MAX(_headerViewInitialY, scrollView.contentOffset.y);
    _headerView.frame = headerFrame;
}

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