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

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

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

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.

Update: iOS v3.2, which added support for kerning, was still under NDA when I posted this. For an update-to-date answer, see How to set kerning in iPhone UILabel.

Answer by Andre for How to change an UILabel/UIFont's letter spacing?

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.

Answer by user363349 for How to change an UILabel/UIFont's letter spacing?

I've extended UILabel to change the character spacing. This should work out the box and pulls font, text, color etc from the UILabel itself (proper coding!).

You may notice I draw the text twice, first with clear color. This is to auto center the text in the label. Whilst this may be inefficient - isn't it nice to be auto centered?

Enjoy!

@interface RALabel : UILabel {  }  @end      @implementation RALabel     - (void) drawRect:(CGRect)rect   {        // Drawing code        CGContextRef context = UIGraphicsGetCurrentContext();      CGContextSelectFont (context, [self.font.fontName cStringUsingEncoding:NSASCIIStringEncoding], self.font.pointSize, kCGEncodingMacRoman);      CGContextSetCharacterSpacing(context, 1);      CGContextSetFillColorWithColor(context, [[UIColor clearColor] CGColor]);      CGAffineTransform myTextTransform = CGAffineTransformScale(CGAffineTransformIdentity, 1.f, -1.f );      CGContextSetTextMatrix (context, myTextTransform);        // draw 1 but invisbly to get the string length.      CGPoint p =CGContextGetTextPosition(context);      float centeredY = (self.font.pointSize + (self.frame.size.height- self.font.pointSize)/2)-2;      CGContextShowTextAtPoint(context, 0, centeredY, [self.text cStringUsingEncoding:NSASCIIStringEncoding], [self.text length]);      CGPoint v =CGContextGetTextPosition(context);        // calculate width and draw second one.      float width = v.x - p.x;      float centeredX =(self.frame.size.width- width)/2;      CGContextSetFillColorWithColor(context, [self.textColor CGColor]);      CGContextShowTextAtPoint(context, centeredX, centeredY, [self.text cStringUsingEncoding:NSASCIIStringEncoding], [self.text length]);    }  

Answer by Krizai for How to change an UILabel/UIFont's letter spacing?

From iOS 6 you can use NSAttributedString in UILabel.

In attributed string you can use attribute NSKernAttributeName to set letter spacing

NSMutableAttributedString* attrStr = [[NSMutableAttributedString alloc] initWithString: @"Test test test test "];  [attrStr addAttribute:NSKernAttributeName value:@(4.0) range:NSMakeRange(0, attrStr.length)];    UILabel* label = [[UILabel alloc] initWithFrame:CGRectMake(0, 300, 300, 100)];  label.attributedText = attrStr;  

Answer by CodeOverRide for How to change an UILabel/UIFont's letter spacing?

In Swift:

let myTitle = "my title"  let titleLabel = UILabel()  let attributes: NSDictionary = [      NSFontAttributeName:UIFont(name: "HelveticaNeue-Light", size: 20),      NSForegroundColorAttributeName:UIColor.whiteColor(),      NSKernAttributeName:CGFloat(2.0)  ]  let attributedTitle = NSAttributedString(string: myTitle, attributes: attributes as? [String : AnyObject])    titleLabel.attributedText = attributedTitle  titleLabel.sizeToFit()  

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