当 UITableView 的 style 属性设置为 Plain 时,这个tableview的section header在滚动时会默认悬停在界面顶端。
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#pragma mark - UIScrollViewDelegate //使用这个方法主要是 让tableview的section不要停留在界面上 - (void)scrollViewDidScroll:(UIScrollView *)scrollView { CGFloat sectionHeaderHeight = 30; if (scrollView.contentOffset.y<=sectionHeaderHeight&&scrollView.contentOffset.y>=0) { scrollView.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0); } else if (scrollView.contentOffset.y>=sectionHeaderHeight) { scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0); } }
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate{ CGFloat sectionHeaderHeight = 30; if (scrollView.contentInset.top < 0 && scrollView.contentInset.top < fabs(sectionHeaderHeight) && scrollView.contentOffset.y <= sectionHeaderHeight+0.5) { [UIView animateWithDuration:0.3f animations:^{ [scrollView setContentOffset:(CGPoint){0,0}]; scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0); }]; } }
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView{ CGFloat sectionHeaderHeight = 30; if (scrollView.contentInset.top < 0 && scrollView.contentInset.top < fabs(sectionHeaderHeight) && scrollView.contentOffset.y <= sectionHeaderHeight+0.5) { [UIView animateWithDuration:0.3f animations:^{ [scrollView setContentOffset:(CGPoint){0,0}]; scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0); }]; } }
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