Based on SO-question: http://stackoverflow.com/questions/19005446/table-header-view-height-is-wrong-when-using-auto-layout-ib-and-font-sizes

Adjust size of table header view with Auto Layout

    CustomHeaderViewWithAutoLayout *customHeaderView = [[CustomHeaderViewWithAutoLayout alloc] init];
    
    CGFloat fittingSize = [customHeaderView systemLayoutSizeFittingSize:UILayoutFittingCompressedSize];
    CGRect fittingFrame = customHeaderView.frame;
    fittingFrame.size = fittingSize;
    customHeaderView.frame = fittingFrame;
    
    tableView.tableHeaderView = customHeaderView;