sectionHeaderHeight为sectionHeader高度
func scrollViewDidScroll(_ scrollView: UIScrollView) {
let sectionHeaderHeight: CGFloat = 30.0
if scrollView.contentOffset.y <= sectionHeaderHeight && scrollView.contentOffset.y >= 0 {
scrollView.contentInset = UIEdgeInsets(top: -scrollView.contentOffset.y, left: 0, bottom: 0, right: 0)
} else if scrollView.contentOffset.y >= sectionHeaderHeight {
scrollView.contentInset = UIEdgeInsets(top: -sectionHeaderHeight, left: 0, bottom: 0, right: 0)
}
}
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