How to know the current size classes and if my button is displayed?

Question

I use size classes in my projet.

I have a button, which is displayed only for

• Compact Width and Compact height
• Compact width and Regular height

This button isn't displayed for other size classes.

On this button I apply a specific effect. But I need to apply this effect ONLY for my 2 sizes classes.

Something like :

if button is available for the current size classe
    apply the effect

Is it possible to implement ?

Answer 1

During ViewWillApper() check the traitCollection of your View Controller.

myViewController: UIViewController{

    mybutton = UIButton(frame: myframe)

    func viewWillAppear(){

        if traitCollection.horizontalSizeClass == .Compact {
            applyAwesomeEffect(myButton)
        }
    }
}