issue-940: Fixed an issue where the TransitionController was not executing the…

issue-940: Fixed an issue where the TransitionController was not executing the lifecycle functions for the initial rootViewController.

CHANGELOG.md

+## 2.12.8
+
+* [issue-940](https://github.com/CosmicMind/Material/issues/940): Fixed an issue where the `TransitionController` was not executing the lifecycle functions for the initial `rootViewController`. 
+
 ## 2.12.7
 
 * [pr-938](https://github.com/CosmicMind/Material/pull/938): An expansion on this PR to fix the lifecycle issues with transitions.

Sources/iOS/TransitionController.swift

@@ -112,6 +112,26 @@ open class TransitionController: UIViewController {
         prepare()
     }
     
+    open override func viewWillAppear(_ animated: Bool) {
+        super.viewWillAppear(animated)
+        rootViewController.beginAppearanceTransition(true, animated: animated)
+    }
+    
+    open override func viewDidAppear(_ animated: Bool) {
+        super.viewDidAppear(animated)
+        rootViewController.endAppearanceTransition()
+    }
+    
+    open override func viewWillDisappear(_ animated: Bool) {
+        super.viewWillDisappear(animated)
+        rootViewController.beginAppearanceTransition(false, animated: animated)
+    }
+    
+    open override func viewDidDisappear(_ animated: Bool) {
+        super.viewDidDisappear(animated)
+        rootViewController.endAppearanceTransition()
+    }
+    
     open override func viewWillLayoutSubviews() {
         super.viewWillLayoutSubviews()
         layoutSubviews()