iOS UitableViewHeader 用autoLayout高度不一致

用如下方法可以是实现

- (void)sizeHeaderToFit

{

UIView *header = self.tableView.tableHeaderView;

[header setNeedsLayout];

[header layoutIfNeeded];

CGFloat height = [header systemLayoutSizeFittingSize:UILayoutFittingCompressedSize].height;

CGRect frame = header.frame;

frame.size.height = height;

header.frame = frame;

self.tableView.tableHeaderView = header;

}