Swift UIlabel 的高级用法，文本显示表情，图片

可以定义一个UIlabel的扩展代码如下

class CPSPFMarkLabel: UILabel {

    convenience init(text: String) {
        self.init(frame:CGRect.zero)
        
        let markLabelText = " 清明时节雨纷纷☺" + text
        self.textAlignment = .center
        self.textColor = UIConstants.AppFontColor
        self.font = UIConstants.DefaultFont15
        self.backgroundColor = UIConstants.AppWhiteColor
        let markAttribute = NSMutableAttributedString(string: markLabelText)
        markAttribute.addAttribute(NSAttributedStringKey.foregroundColor, value:UIConstants.AppRedColor, range: NSRange(location: 6,length: text.count))
        //以上是富文本显示
        let arkattch = NSTextAttachment() //定义一个attachment
        markattch.image = UIImage(named: "image_timing")//初始化图片
        markattch.bounds = CGRect(x: 0, y: -1, width: 15, height: 15) //初始化图片的 bounds
        let markattchStr = NSAttributedString(attachment: markattch) // 将attachment  加入富文本中
        markAttribute.insert(markattchStr, at: 0)// 将markattchStr  加入原有文字的某个位置
        self.attributedText = markAttribute
    }
}