如何去掉UITableView中的header和footer的粘连效果

只需要加入以下代码即可

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {    CGFloat sectionHeaderHeight = 40;    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);    }}