iphone - make UIView in UIScrollView stick to the top when scrolled up -

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so in uitableview when have sections section view sticks top until next section overlaps , replaces on top. want have similar effect, have uiview in uiscrollview, representing sections uiview , when hits top.. want stay in there , not carried up. how do this? think needs done in either layoutsubviews or scrollviewdidscroll , manipulation on uiview..

to create uiview in uiscrollview stick top when scrolled 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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