view.traitCollection.horizontalSizeClass returning undefined (0) in viewDidLoad

Question

I\'m using a UITextView inside a UIPageViewController, and I want to determine the font size based on the size class of the device.

The first slide of the page view is l

Answer 1

You will be better off moving that code to the viewWillAppear method, as in the viewDidLoad the ViewController's view has not been added to the hierarchy yet, and you might get an empty trait collection.