Swift 4.1富文本实现

基于swift4.1写了个简单富文本的实现例子，如有其它需求可在NSAttributedStringKey后面更改相应的属性

 func transformContentText() -> NSMutableAttributedString {
        let name:String = "胖虎";
        let content:String = ":你特么是在刁难我胖虎么";
        let str:String = name + content
        let attributedStr = NSMutableAttributedString.init(string: str)
        attributedStr.addAttributes([NSAttributedStringKey.font : UIFont.systemFont(ofSize: 14)], range: NSMakeRange(0, str.count))
        attributedStr.addAttributes([NSAttributedStringKey.foregroundColor : UIColor.nameColor], range: NSMakeRange(0, name.count))
        attributedStr.addAttributes([NSAttributedStringKey.foregroundColor : UIColor.green], range: NSMakeRange(name.count, content.count))
        return attributedStr
    }