How to change height of grouped UITableView header?

Question

I know how to change the height of the section headers in the table view. But I am unable to find any solution to change the default spacing before the first section.

Answer 1

If you use tableView style grouped, tableView automatically set top and bottom insets. To avoid them and avoid internal insets setting, use delegate methods for header and footer. Never return 0.0 but CGFLOAT_MIN.

Objective-C

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section {
    // Removes extra padding in Grouped style
    return CGFLOAT_MIN;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section {
    // Removes extra padding in Grouped style
    return CGFLOAT_MIN;
}

Swift

func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
    // Removes extra padding in Grouped style
    return CGFloat.leastNormalMagnitude
}

func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
    // Removes extra padding in Grouped style
    return CGFloat.leastNormalMagnitude
}