UITableViewStyleGrouped default header view? - uitableview

Question

I'm trying to implement a control for deleting entire sections, and it would look best in my app if the delete button was in the header, as opposed to an overlay like a UIPopoverView.
In the process of writing this question, I found the answer. Easy enough, once there's a starting point.

Answer 1

I got the bulk of the code from this blog which has only two posts, both from 2010.
Then I went back to this site just for the font color, since it's more trouble to break apart.
Three minor problems, all with the label.
- Font is too narrow
- Text color is too dark
- Label origin is wrong
The default font is known, so that comes first.
label.font = [UIFont boldSystemFontOfSize:17.0];
Color is next, since that's easy. Used an image editor's Eyedropper tool for this.
label.textColor = [UIColor colorWithRed:0.298 green:0.337 blue:0.423 alpha:1];
// Is there a difference between alpha:1 and alpha:1.000?
Then the hard part. A close guess, and then some tweaking for a perfect match.
label.frame = CGRectMake(54, 4, headerView.frame.size.width-20, 22);
And now we have a custom implementation that perfectly matches the current Grouped header.
Finished code:
- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {
UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, tableView.frame.size.width, 40)];
tableView.sectionHeaderHeight = headerView.frame.size.height;
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(54, 4, labelSize.width, labelSize.height)];
[label setBackgroundColor:[UIColor clearColor]];
[label setFont:[UIFont boldSystemFontOfSize:17.0]];
[label setShadowColor:[UIColor whiteColor]];
[label setShadowOffset:CGSizeMake(0, 1)];
[label setText:[self tableView:tableView titleForHeaderInSection:section]];
[label setTextColor:[UIColor colorWithRed:0.298 green:0.337 blue:0.423 alpha:1.000]];
[headerView addSubview:label];
return headerView;
}
Found this SO answer after finding the right font/color myself. Oh well.
Edit:
For a title label that allows an effectively unlimited amount of text:
// before label init
NSString *title = [self tableView:tableView titleForHeaderInSection:section];
NSUInteger maxWidth = headerView.frame.size.width-108;
CGSize labelSize = [title sizeWithFont:[UIFont systemFontOfSize:17.0]
constrainedToSize:CGSizeMake(maxWidth, CGFLOAT_MAX)];
if (labelSize.width < maxWidth) labelSize.width = maxWidth;
// after setFont:
[label setNumberOfLines:0];