如何根据屏幕大小 - iOS Swift缩放属性字符串文本？

Question

所以我有一个应用程序，其中的内容出现在textview中。 我正在使用属性字符串，因为文本的某些部分包含指向网站的链接。 问题是内容字体大小。它在iPad上太小了。在iPhone中看起来很好。以下是我正在使用的代码。

 let attributedString = NSMutableAttributedString(string: "About\n      The Common Room Virtual Fireplace App was designed with love by 5x entrepreneur, Arjun Rai. The goal of this is to create the ultimate mobile and relaxing ambience anywhere and anytime. Rai’s passion for fireplaces along with minimalism in art has led him to build several apps and startups over the years since he was a teenager. Common Room is yet another effort to bringing beautiful experiences to everyone...just a bit more relaxing this time around. :) Follow him at twitter.com/arjunraime")


    attributedString.addAttribute(NSLinkAttributeName, value: "http://arjunrai.me/", range: NSRange(location: 92, length: 10))

    attributedString.addAttribute(NSLinkAttributeName, value: "https://itunes.apple.com/in/genre/ios/id36?mt=8", range: NSRange(location: 14, length: 33))

    attributedString.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-UltraLight", size: 12.0)!, range: NSRange(location: 0, length: 506))

    attributedString.addAttribute(NSForegroundColorAttributeName, value: UIColor.white, range: NSRange(location: 0, length: 506))

    attributedString.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 0, length: 5))

    attributedString.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 15, length: 33))

    attributedString.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 92, length: 11))

    attributedString.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 470, length: 36))

    attributedString.addAttribute(NSParagraphStyleAttributeName, value: paragraph, range: NSRange(location: 0, length: 506))

    infoTextview.attributedText = attributedString

    /*************************how it works****************/

    let attributedString1 = NSMutableAttributedString(string: "How it Works?\n       Common Room works alongside any of your favorite music apps. Simply start Common Room app first followed by opening your favorite music app to play songs then return back. You can control the volume of the fire crackle as well as turn it on and off via the menu in Common Room. Enjoy!")

    attributedString1.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-UltraLight", size: 12.0)!, range: NSRange(location: 0, length: 305))

    attributedString1.addAttribute(NSForegroundColorAttributeName, value: UIColor.white, range: NSRange(location: 0, length: 305))

    attributedString1.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 0, length: 13))

    attributedString1.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 60, length: 21))

    attributedString1.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 231, length: 9))

    attributedString1.addAttribute(NSFontAttributeName, value: UIFont(name: "AvenirNext-Medium",size: 12.0)!, range:NSRange(location: 258, length: 12))


    attributedString1.addAttribute(NSParagraphStyleAttributeName, value: paragraph, range: NSRange(location: 0, length: 305))


    infoTextview1.attributedText = attributedString1

有没有办法根据屏幕尺寸自动缩放文字？ 自适应大小是唯一的方法，因为没有在输出中产生任何明显的差异。

请查看当前代码的不同输出。

iPad屏幕输出

iPhone屏幕输出

有人能告诉我怎么做吗？