Change font size for iPad Pro in steps

Question

I have an app, which is intended only for iPad in landscape mode. The screen design is completely done in IB with autolayout.

Now I want to achieve the following behavio

Answer 1

1. Subclass UILabel, set that class for every uilabel in your Interface Builder.

2. Create a enum for all different types/fonts you want to support, and create a function in that enum that returns e.g. a font size

3. Determine the current device and store it in a value from the enum

4. Override the initializers for your subclassed UILabel in step 1 and get the font size from the variabele defined in step 3, with the vales in step 2

Code:

var currentScreen = Screens.iPadLarge //change this to current device


enum Screens{
    case iPadLarge, iPadSmall
    func getFont() -> CGFloat{
        switch self{
        case .iPadLarge:
            return 40
        case .iPadSmall:
            return 20
        }
    }
}

class MyLabel: UILabel{

    init(frame: CGRect){
        super.init(frame: frame)
        commonLoad()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        commonLoad()
    }

    func commonLoad(){
        let fontSize = currentScreen.getFont()
        //use fontSize
    }
}