Swift字符串长度计算和Lable不同颜色

let uname:String = "abcdefg hijklmn opq rst uvw x"

let length = uname.lengthOfBytes(using: String.Encoding(rawValue: String.Encoding.utf8.rawValue))

let leng = uname.characters.count(用这个)

print(length)

var myMutableString = NSMutableAttributedString()

myMutableString = NSMutableAttributedString(string: uname, attributes: [NSFontAttributeName:UIFont(name:"Georgia", size:14.0)!])

//添加不同字体颜色

myMutableString.addAttribute(NSForegroundColorAttributeName, value:UIColor.red, range:NSRange(location:1,length:4))

//添加不同字体大小

myMutableString.addAttribute(NSFontAttributeName, value:UIFont.systemFont(ofSize: 26.0), range:NSRange(location:1,length:4))

let lable = UILabel()

lable.frame = CGRect(x: 0, y: 60, width: 375, height: 40)

lable.backgroundColor = UIColor.lightGray

lable.attributedText = myMutableString

view.addSubview(lable)