Calling method sizeToFit on a UILabel that has subscripts is not working

Question

I have a subclass of UILabel, which is supposed to update its text when the user types something. Naturally, as the length of text increases, the size of the label must adju

Answer 1

You should override the UILabel method (CGSize)sizeThatFits:(CGSize)size in your subclass like example below. I just add 10pt to the height calculated by UILabel to accommodate the subscript.

@implementation ESKLabel
- (CGSize)sizeThatFits:(CGSize)size
{
    CGSize theSize = [super sizeThatFits:size];
    return CGSizeMake(theSize.width, theSize.height + 10);
}
@end

Sample output:

self.eskLabel.text = @"Hello Long² Long\u2082 World";
NSLog(@"CGSize: %@", NSStringFromCGSize(self.eskLabel.frame.size));
[self.eskLabel sizeToFit];
NSLog(@"CGSize: %@", NSStringFromCGSize(self.eskLabel.frame.size));

From the NSLog:

This GDB was configured as "x86_64-apple-darwin".sharedlibrary apply-load-rules all Attaching to process 864. 
2012-01-06 23:34:21.949 Stackoverflow4[864:f803] CGSize: {85, 61} 
2012-01-06 23:34:21.951 Stackoverflow4[864:f803] CGSize: {302, 44} 
kill 
quit

Answer 2

This should to the trick:

self.eskLabel.adjustsFontSizeToFitWidth = YES;