add a new hook method onViewCreated for QMUIFragment

arch/src/main/java/com/qmuiteam/qmui/arch/QMUIFragment.java

@@ -35,6 +35,7 @@ import android.widget.FrameLayout;
 import com.qmuiteam.qmui.QMUILog;
 import com.qmuiteam.qmui.util.QMUIKeyboardHelper;
 import com.qmuiteam.qmui.util.QMUIViewHelper;
+import com.qmuiteam.qmui.widget.QMUITopBar;
 
 import java.lang.reflect.Field;
 import java.util.ArrayList;
@@ -275,6 +276,9 @@ public abstract class QMUIFragment extends Fragment implements QMUIFragmentLazyL
     @Override
     public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
+        if(mBaseView.getTag(R.id.qmui_arch_reused_layout) == null){
+            onViewCreated(mBaseView);
+        }
         mLazyViewLifecycleOwner = new QMUIFragmentLazyLifecycleOwner(this);
         mLazyViewLifecycleOwner.setViewVisible(getUserVisibleHint());
         getViewLifecycleOwner().getLifecycle().addObserver(mLazyViewLifecycleOwner);
@@ -310,6 +314,7 @@ public abstract class QMUIFragment extends Fragment implements QMUIFragmentLazyL
             if (rootView.getParent() != null) {
                 ((ViewGroup) rootView.getParent()).removeView(rootView);
             }
+            rootView.setTag(R.id.qmui_arch_reused_layout, true);
         }
         if (translucentFull()) {
             rootView.setFitsSystemWindows(false);
@@ -674,6 +679,7 @@ public abstract class QMUIFragment extends Fragment implements QMUIFragmentLazyL
                 mCacheSwipeBackLayout = swipeBackLayout;
             } else {
                 swipeBackLayout = mCacheSwipeBackLayout;
+                mCacheRootView.setTag(R.id.qmui_arch_reused_layout, true);
             }
         }
 
@@ -850,6 +856,19 @@ public abstract class QMUIFragment extends Fragment implements QMUIFragmentLazyL
      */
     protected abstract View onCreateView();
 
+
+    /**
+     * Corresponding to {@link #onCreateView()}, it called only when new UI (not cached UI)
+     * is created by {@link #onCreateView()}.
+     * It may be used to bind views to fragment and dynamically create child views such as
+     * {@link QMUITopBar#addLeftBackImageButton()}
+     *
+     * @param rootView the view created by {@link #onCreateView()}
+     */
+    protected void onViewCreated(@NonNull View rootView){
+
+    }
+
     /**
      * Will be performed in onStart
      *

arch/src/main/java/com/qmuiteam/qmui/arch/SwipeBackLayout.java

@@ -419,6 +419,18 @@ public class SwipeBackLayout extends QMUIWindowInsetLayout {
         }
     }
 
+    @Override
+    public boolean applySystemWindowInsets19(Rect insets) {
+        super.applySystemWindowInsets19(insets);
+        return true;
+    }
+
+    @Override
+    public boolean applySystemWindowInsets21(Object insets) {
+        super.applySystemWindowInsets21(insets);
+        return true;
+    }
+
     @Override
     protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
         final boolean drawContent = child == mContentView;

arch/src/main/res/values/ids.xml

@@ -18,4 +18,5 @@
 <resources>
     <item name="qmui_arch_swipe_layout_in_back" type="id"/>
     <item name="qmui_arch_swipe_offset_helper" type="id"/>
+    <item name="qmui_arch_reused_layout" type="id"/>
 </resources>