Change font and size in watchkit

1. Create IBOutlet of your WKInterfaceLabel
2. Create UIFont object
   
   
   UIFont * labelFont = [UIFont fontWithName:@"Courier-Bold" size:8];
   
3. Create NSAttributedString object
   
   
   NSAttributedString *labelText = [[NSAttributedString alloc] initWithString : @"my Label string title" attributes : @{ NSKernAttributeName : @2.0, NSFontAttributeName : labelFont}];
   
4. set attributedString to label
   
   
   [self.label setAttributedText:labelText];