fix(layouts): Set automaticallyAdjustsScrollViewInsets (#5311)

tns-core-modules/ui/core/view/view.d.ts

@@ -768,6 +768,8 @@ export const isEnabledProperty: Property<View, boolean>;
 export const isUserInteractionEnabledProperty: Property<View, boolean>;
 
 export namespace ios {
+    export function isContentScrollable(controller: any /* UIViewController */, owner: View): boolean 
+    export function updateAutoAdjustScrollInsets(controller: any /* UIViewController */, owner: View): void
     export function updateConstraints(controller: any /* UIViewController */, owner: View): void;
     export function layoutView(controller: any /* UIViewController */, owner: View): void;
     export class UILayoutViewController {

tns-core-modules/ui/core/view/view.ios.ts

@@ -575,21 +575,26 @@ export class CustomLayoutView extends View {
     }
 }
 
-function isScrollable(controller: UIViewController, owner: View): boolean {
-    let scrollable = (<any>owner).scrollableContent;
-    if (scrollable === undefined) {
-        const view: UIView = controller.view.subviews.count > 0 ? controller.view.subviews[0] : null;
-        if (view instanceof UIScrollView) {
-            scrollable = true;
-        }
-    }
-
-    return scrollable === true || scrollable === "true";;
-}
-
 const majorVersion = iosUtils.MajorVersion;
 
 export namespace ios {
+    export function isContentScrollable(controller: UIViewController, owner: View): boolean {
+        let scrollableContent = (<any>owner).scrollableContent;
+        if (scrollableContent === undefined) {
+            const view: UIView = controller.view.subviews.count > 0 ? controller.view.subviews[0] : null;
+            if (view instanceof UIScrollView) {
+                scrollableContent = true;
+            }
+        }
+
+        return scrollableContent === true || scrollableContent === "true";;
+    }
+
+    export function updateAutoAdjustScrollInsets(controller: UIViewController, owner: View): void {
+        const scrollable = isContentScrollable(controller, owner);
+        controller.automaticallyAdjustsScrollViewInsets = scrollable;
+    }
+
     export function updateConstraints(controller: UIViewController, owner: View): void {
         const root = controller.view;
         if (!root.safeAreaLayoutGuide) {
@@ -619,28 +624,18 @@ export namespace ios {
     }
 
     export function layoutView(controller: UIViewController, owner: View): void {
-        const fullscreen = controller ===
-            iosUtils.getter(UIApplication, UIApplication.sharedApplication).keyWindow.rootViewController;
-
         let left: number, top: number, width: number, height: number;
 
         const frame = controller.view.frame;
         const fullscreenOrigin = frame.origin;
         const fullscreenSize = frame.size;
-
-        if (fullscreen) {
-            left = layout.toDevicePixels(fullscreenOrigin.x);
-            top = layout.toDevicePixels(fullscreenOrigin.y);
-            width = layout.toDevicePixels(fullscreenSize.width);
-            height = layout.toDevicePixels(fullscreenSize.height);
-        } else {
         const safeArea = controller.view.safeAreaLayoutGuide.layoutFrame;
         const safeOrigin = safeArea.origin;
         const safeAreaSize = safeArea.size;
 
         const navController = controller.navigationController;
         const navBarHidden = navController ? navController.navigationBarHidden : true;
-            const scrollable = isScrollable(controller, owner);
+        const scrollable = isContentScrollable(controller, owner);
         const hasChildControllers = controller.childViewControllers.count > 0;
 
         const safeAreaTopLength = safeOrigin.y - fullscreenOrigin.y;
@@ -678,7 +673,6 @@ export namespace ios {
         top = layout.toDevicePixels(top);
         width = layout.toDevicePixels(width);
         height = layout.toDevicePixels(height);
-        }
 
         const widthSpec = layout.makeMeasureSpec(width, layout.EXACTLY);
         const heightSpec = layout.makeMeasureSpec(height, layout.EXACTLY);
@@ -736,7 +730,13 @@ export namespace ios {
         public viewWillAppear(animated: boolean): void {
             super.viewWillAppear(animated);
             const owner = this.owner.get();
-            if (owner && !owner.parent) {
+            if(!owner){
+                return;
+            }
+        
+            updateAutoAdjustScrollInsets(this, owner);
+
+            if (!owner.parent) {
                 owner.callLoaded();
             }
         }

tns-core-modules/ui/page/page.ios.ts

@@ -106,6 +106,9 @@ class UIViewControllerImpl extends UIViewController {
             frame._updateActionBar(owner);
         }
 
+        // Set autoAdjustScrollInsets in will appear - as early as possible
+        iosView.updateAutoAdjustScrollInsets(this, owner);
+
         // Pages in backstack are unloaded so raise loaded here.
         if (!owner.isLoaded) {
             owner.callLoaded();

tns-core-modules/ui/tab-view/tab-view.ios.ts

@@ -32,7 +32,13 @@ class UITabBarControllerImpl extends UITabBarController {
     public viewWillAppear(animated: boolean): void {
         super.viewWillAppear(animated);
         const owner = this._owner.get();
-        if (owner && !owner.parent) {
+        if(!owner){
+            return;
+        }
+
+        iosView.updateAutoAdjustScrollInsets(this, owner);
+
+        if (!owner.parent) {
             owner.callLoaded();
         }
     }