fix: implement canGoBack for tab router (#51)

react-navigation · Aug 13, 2019 · 2b8f2ed · 2b8f2ed
1 parent 8134895
commit 2b8f2ed
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Showing 2 changed files with 4 additions and 4 deletions.
diff --git a/packages/core/src/BaseRouter.tsx b/packages/core/src/BaseRouter.tsx
@@ -69,10 +69,6 @@ const BaseRouter = {
   shouldActionChangeFocus(action: CommonAction) {
     return action.type === 'NAVIGATE';
   },
-
-  canGoBack() {
-    return false;
-  },
 };
 
 export default BaseRouter;
diff --git a/packages/routers/src/TabRouter.tsx b/packages/routers/src/TabRouter.tsx
@@ -211,6 +211,10 @@ export default function TabRouter({
       return action.type === 'NAVIGATE';
     },
 
+    canGoBack(state) {
+      return router.getStateForAction(state, { type: 'GO_BACK' }) !== null;
+    },
+
     actionCreators: TabActions,
   };