Add several attributes to a NSMutableAttributedString - swift

Question

I'm trying to add several attributes to a NSMutableAttributedString; i tried this:
let stringNumero: NSString = "\(squadra.cori.count)" //= two-digit number
var stringNumeroMutable = NSMutableAttributedString()
stringNumeroMutable = NSMutableAttributedString(string: stringNumero as! String, attributes: [NSFontAttributeName: UIFont(name: "Noteworthy-Light", size: 9)!,
NSForegroundColorAttributeName: UIColor(red: 110/255.0, green: 183/255.0, blue: 93/255.0, alpha: 1.0)])
cell.numeroCori.attributedText = stringNumeroMutable
now I'd like to add an other attributes and i'm going uso this code:
stringNumeroMutable.addAttribute(NSFontAttributeName, value: UIFont.boldSystemFontOfSize(8), range: NSRange(location: 0, length: 1))
but I'm incurring in a problem:
as you see, the bold effect is attributed only to the first digit and the previous attributed (such as the font) disappear. I think the the second NSFontAttributedName subscribe the previous one, so is there any way to set both font and bold?
Thanks a lot!!!
Edit: as suggested i tried to recall the method like this:
let stringNumero: NSString = "\(squadra.cori.count)" //= two-digit number
var stringNumeroMutable = NSMutableAttributedString()
stringNumeroMutable = NSMutableAttributedString(string: stringNumero as! String, attributes: [NSFontAttributeName: UIFont(name: "Noteworthy-Light", size: 9)!,
NSForegroundColorAttributeName: UIColor(red: 110/255.0, green: 183/255.0, blue: 93/255.0, alpha: 1.0)])
cell.numeroCori.attributedText = stringNumeroMutable
stringNumeroMutable.addAttribute(NSFontAttributeName, value: UIFont.boldSystemFontOfSize(9), range: NSRange(location: 0, length: stringNumeroMutable.length))
cell.numeroCori.atributedText = stringNumeroMutable
but the second call overwrite the first one (so the number loose the attributed font). How to solve this?

Answer 1

I think your problem, that you use method boldSystemFontOfSize
boldSystemFontOfSize:
Returns the font object used for standard interface items that are
rendered in boldface type in the specified size.
See my solution:
#IBOutlet weak var label: UILabel!
var mutableAttributedString: NSMutableAttributedString!
override func viewDidLoad() {
super.viewDidLoad()
let someString = "Hello World"
let attr: [String: AnyObject] = [NSFontAttributeName: UIFont(name: "Helvetica", size: 10)!,
NSForegroundColorAttributeName: UIColor(red: 0.18, green: 0.18, blue: 0.18, alpha: 1.0)]
mutableAttributedString = NSMutableAttributedString(string: someString, attributes: attr)
label.attributedText = mutableAttributedString
}
#IBAction func buttonPressed(sender: UIButton) {
let font = mutableAttributedString.attribute(NSFontAttributeName, atIndex: 1, effectiveRange: nil)!
mutableAttributedString.addAttribute(NSFontAttributeName, value: font.fontWithSize(20) , range: NSMakeRange(0, mutableAttributedString.length))
label.attributedText = mutableAttributedString
}
In buttonPressed function you define current font of mutableAttributedString and then you can change font's size with method fontWithSize.