CGFloat sectionHeaderHeight = FitValue(40);//此高度为heightForHeaderInSection高度值
if (scrollView.contentOffset.y >= sectionHeaderHeight) {
scrollView.contentInset = UIEdgeInsetsMake(-sectionHeaderHeight, 0, 0, 0);
}else {
scrollView.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);
}












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