How to change an UILabel/UIFont's letter spacing?

Question

Hi,

I've searched loads already and couldn't find an answer.

I have a normal UILabel, defined this way:

    UILabel *totalColors = [[[UILabel alloc] initWithFrame:CGRectMake(5, 7, 120, 69)] autorelease];
    totalColors.text = [NSString stringWithFormat:@"%d", total];
    totalColors.font = [UIFont fontWithName:@"Arial-BoldMT" size:60];
    totalColors.textColor = [UIColor colorWithRed:221/255.0 green:221/255.0 blue:221/255.0 alpha:1.0];
    totalColors.backgroundColor = [UIColor clearColor];
    [self addSubview:totalColors];

And I wanted the horizontal spacing between letters, to be tighter, whilst mantaining the font size.

Is there a way to do this? It should be a pretty basic thing to do.

Cheers guys, Andre

UPDATE:

So I was forced to do it like this:

- (void) drawRect:(CGRect)rect 
{
    CGContextRef context = UIGraphicsGetCurrentContext();

    CGContextSelectFont (context, "Arial-BoldMT", 60, kCGEncodingMacRoman);
    CGContextSetCharacterSpacing (context, -10);
    CGContextSetTextDrawingMode (context, kCGTextFill);

    CGContextSetRGBFillColor(context, 221/255.0, 221/255.0, 221/255.0, 221/255.0);
    CGAffineTransform xform = CGAffineTransformMake(1.0, 0.0, 0.0, -1.0, 0.0, 0.0);
    CGContextSetTextMatrix(context, xform);

    char* result = malloc(17);
    sprintf(result, "%d", totalNumber);

    CGContextShowTextAtPoint (context, 0, 54, result, strlen(result));
}

But I need to align this to the right. I could do that manually if I knew the width of the drawn text, but it's proving near impossible to find that.

I've read about ATSU, but I couldn't find any examples.

This sucks :/

Answer 1

Not in any publicly available version of iPhone OS. ;-) If you are a current iPhone Developer, you can get an idea of where iPhone OS is going by looking through the "What's New" notes for iPhone OS 3.2.

Answer 2

I've come up with a solution for the letter spacing and the alignment to the right.

Here it goes:

    NSString *number = [NSString stringWithFormat:@"%d", total];

    int lastPos = 85;

    NSUInteger i;
    for (i = number.length; i > 0; i--)
    {
        NSRange range = {i-1,1};
        NSString *n = [number substringWithRange:range];

        UILabel *digit = [[[UILabel alloc] initWithFrame:CGRectMake(5, 10, 35, 50)] autorelease];
        digit.text = n;
        digit.font = [UIFont fontWithName:@"Arial-BoldMT" size:60];
        digit.textColor = [UIColor colorWithRed:221/255.0 green:221/255.0 blue:221/255.0 alpha:1.0];
        digit.backgroundColor = [UIColor clearColor];
        [self addSubview:digit];

        CGSize textSize = [[digit text] sizeWithFont:[digit font]];
        CGFloat textWidth = textSize.width;

        CGRect rect = digit.frame;
        rect.origin.x = lastPos - textWidth;
        digit.frame = rect;

        lastPos = rect.origin.x + 10;
    }

The letter spacing is the "10" on the last line. The alignment comes from the lastPos.

Hope this helps anyone out there.