ios 文字变色

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extension UILabel{        func paint(aText:String,aColor:UIColor?,startIndex:Int,endIndex:Int){        self.text = aText        if (attributedText != nil && aColor != nil){            let attr = NSMutableAttributedString(attributedString: self.attributedText!)            attr.addAttribute(NSForegroundColorAttributeName, value: aColor!, range: NSMakeRange(startIndex, startIndex + endIndex))            attributedText = attr        }    }        func paint(aFirstText:String,aSecondText:String,sSecondTextColor:UIColor){        self.text = aFirstText + aSecondText        if (attributedText != nil ){            let attr = NSMutableAttributedString(attributedString: self.attributedText!)            attr.addAttribute(NSForegroundColorAttributeName, value: sSecondTextColor, range: NSMakeRange(aFirstText.length(), aSecondText.length()))            attributedText = attr        }    }    }

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