Merge branch '162-use-traitcollectiondidchange-delegate-for-dark-mode' into 'release/2.2.0'

Resolve "Use traitCollectionDidChange delegate for dark mode"

See merge request ios/client-library-apple!219

PIALibrary/Sources/UI/iOS/ViewControllers/AutolayoutViewController.swift

@@ -69,11 +69,15 @@ open class AutolayoutViewController: UIViewController, ModalController, Restylab
     /// :nodoc:
     open override func viewDidLayoutSubviews() {
         super.viewDidLayoutSubviews()
+        refreshOrientationConstraints(size: view.bounds.size)
+    }
+    
+    open override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) {
+        super.traitCollectionDidChange(previousTraitCollection)
         //MARK: - iOS13 Dark mode
         if #available(iOS 13.0, *) {
             Macros.postNotification(.PIAThemeShouldChange)
         }
-        refreshOrientationConstraints(size: view.bounds.size)
     }
     
     private func refreshOrientationConstraints(size: CGSize) {