Texfield no acepta numeros (Swift 2)

func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool { let set = NSCharacterSet.decimalDigitCharacterSet() let components = string.componentsSeparatedByCharactersInSet(set) let filtered = components.joinWithSeparator("") return string == filtered }

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