Tips for incorporating a callBack function when the screen changes in react-native:

Is there a way to implement a callback function that executes whenever the screen changes, such as moving from the home screen to the about screen?

Situation

I would like to create a global stack that triggers a callback function whenever any navigation occurs, for purposes like checking user tokens, internet connectivity, location status, etc.

Attempt

I attempted to create a class component for Stack Navigation and used `UNSAFE_componentWillUpdate` to detect any navigation changes.

Code Snippet:

UNSAFE_componentWillUpdate(prevProps, prevState) {
    if (prevProps !== this.props) {
      console.log('Navigation state has changed');
    }
  }

Issue Encountered

  • The method fails to detect the initial screen (index-zero) - the Home screen.
  • It requires code implementation for each stack separately.

My Stack Implementation

<Stack.Navigator>
    <Stack.Screen
      name="Home"
      component={Home}
    />
   <Stack.Screen
      name="About"
      component={About}
    />
</Stack.Navigator>

Answer №1

To retrieve the current route, use the "onNavigationStateChange" prop within the "NavigationContainer"

Upgrade to React Navigation 4.x

onNavigationStateChange={(prevState, currentState) => {
    const currentScreen = this.getCurrentRouteName(currentState);
    const prevScreen = this.getCurrentRouteName(prevState);
}}

// function to get the current screen from navigation state
function getCurrentRouteName(navigationState) {
  if (!navigationState) {
    return null;
  }
  const route = navigationState.routes[navigationState.index];
  // handle nested navigators
  if (route.routes) {
    return getCurrentRouteName(route);
  }
  return route.routeName;
}

Upgrade to React Navigation 5.x

<NavigationContainer
    ref={navigationRef}
    onReady={() => routeNameRef.current = navigationRef.current.getCurrentRoute().name}
    onStateChange={() => {
      const previousRouteName = routeNameRef.current;
      const currentRouteName = navigationRef.current.getCurrentRoute().name

      if (previousRouteName !== currentRouteName) {
        // Use expo-firebase-analytics tracker or another Mobile analytics SDK
        Analytics.setCurrentScreen(currentRouteName);
      }

      routeNameRef.current = currentRouteName;
    }}
 >
   {/* ... */}
 </NavigationContainer>

Answer №2

When working with React Navigation version 5.x, you can use the following code snippet:

<NavigationContainer
  onStateChange={(st) => {
      let routeName = st.routes[st.index].name
      /* Add your own custom code here */
  }}>
</NavigationContainer>

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