Merge branch 'master' of github.com:nativescript-community/ui-material-components

Author: farfromrefug

packages/core-tabs/platforms/android/java/com/nativescript/material/core/TabsBar.java

@@ -178,7 +178,7 @@ public void setViewPager(ViewPager2 viewPager) {
     public void setItems(TabItemSpec[] items) {
         mTabStrip.removeAllViews();
         mTabItems = items;
-        if (mViewPager != null) {
+        if (mViewPager != null && mViewPager.getAdapter() != null) {
             populateTabStrip();
         }
 

src/tabs/index.ios.ts

@@ -207,7 +207,7 @@ class UIPageViewControllerImpl extends UIPageViewController {
         let scrollView: UIScrollView = null;
 
         for (let i = 0; i < subViews.count; i++) {
-            const view: UIView = subViews[i];
+            const view: UIView = subViews.objectAtIndex(i);
             if (view instanceof UIScrollView && !(view instanceof MDCTabBarView)) {
                 scrollView = view;
             }