如何在swift 3中使用addAttribute和NSRANGE

嗨,我正在尝试在 Swift3中使用addAttribute.

我想要只设置粗体IDNAME.

这就是我想要的.

let boldUsername = NSMutableAttributedString(string: "IDNAME hi nice 2 meet you :D #HELLOW")


//            boldUsername.addAttribute(NSFontAttributeName,value: UIFont(name: "SFUIText-Bold",size: 14)!,range: (boldUsername.string as Nsstring).range(of: " "))

            boldUsername.addAttribute(NSFontAttributeName,range: NSRange(location: 0,length: 5))

我如何获得IDNAME的索引,即每次都不同？

– >有没有办法分割空间并获得索引？

你需要做这样的事情.

let personName = "Black"
let wholeStr = "\(personName) hi nice 2 meet you :D #HELLOW"
let boldUsername = NSMutableAttributedString(string: wholeStr)
boldUsername.addAttribute(NSFontAttributeName,range: (wholeStr as Nsstring).range(of: personName))