how to use tabBarOnPress in tabnavigator react native

Question

i am stuck in big problem that is i wants onPress event when i clicked on tab. my code is here:-

static navigationOptions = ({navigation, screenProps}) => {
          


        

Answer 1

I used stack navigator

const Stack = createStackNavigator({
    ScreenA: {
        screen:ScreenA ,
        navigationOptions: () => ({
            header: null
        }),
    },
    ScreenB: {
        screen:ScreenB ,
        navigationOptions: () => ({
            header: null
        }),
    },
});

//Added tabBarOnPress

https://reactnavigation.org/docs/en/stack-actions.html the popToTop action takes you back to the first screen in the stack, dismissing all the others. It's functionally identical to StackActions.pop({n: currentIndex}).

import { StackActions } from 'react-navigation';
let Tabs = createBottomTabNavigator(
  {
    FooTab: Foo,
  },
  {
    initialRouteName: "FooTab",
    defaultNavigationOptions: ({ navigation }) => ({
    tabBarOnPress: ({ navigation, defaultHandler }) => {
      // to navigate to the top of stack whenever tab changes
      navigation.dispatch(StackActions.popToTop());
      defaultHandler();
      ]},
    }),
  }
);