How to detect Dynamic Font size changes from iOS Settings?

Question

Inside settings->general->text size, after changing the text size, I\'d have to exit my own app to have the sizes applied to

 [UIFont preferredFontForTextStyle:.         


        

Answer 1

You listen for the Size Change Notification on UIContentSizeCategory.

Swift 3.0: NSNotification.Name.UIContentSizeCategoryDidChange

Swift 4.0 or later: UIContentSizeCategory.didChangeNotification