Block/Disable tabs in TabNavigator - react-navigation

问题

I have a TabNavigator as shown in the picture. Header Image

I am using TabNavigator for creating these tabs as below.

const Tab_Navigator = TabNavigator({
    First:{
        screen: First,
    },
    Second:{
        screen: Second,
    },
    Third:{
        screen: Third,
    },

Now I want to block/disable "Second" and "Third" tabs. It should be visible but one shouldn't able to navigate to them.

I tried blocking these tabs as shown here but I guess I am missing something. My try:

Tab_Navigator.router.getStateForAction = (action, state) => {
if( action.type === NavigationActions.navigate({ routeName: "Second"}) ||
    action.type === NavigationActions.navigate({ routeName: "Third"}))
{
    return null;
}

return Byte.router.getStateForAction(action, state);

};

回答1:

In this case, the action.type = "Navigation/NAVIGATE" and action.routeName is the name of your tab. It is just a little different from the ReactNavigation Routers example. The following should work:

const defaultGetStateForAction = Tab_Navigator.router.getStateForAction;

Tab_Navigator.router.getStateForAction = (action, state) => {
  if ((action.type === NavigationActions.NAVIGATE) &&
     (action.routeName === "Second" || action.routeName === "Third") {
    return null;
  }

  return defaultGetStateForAction(action, state);
};

EDIT: Here is an image of the the Chrome Debugger stopped at a breakpoint in a very similar piece of code(tab names are different), but it shows the values of the "action" object being passed into this function.

回答2:

You have to use tabBarOnPress propert under defaultNavigationOptions, and check the route name to which you dont want to navigate return them null else return defaultHandler. Please check the following code

const Tab_Navigator = createBottomTabNavigator({ First:{ screen: First, }, Second:{ screen: Second, }, Third:{ screen: Third, } }, defaultNavigationOptions: ({ navigation }) => ({ tabBarOnPress: ({ navigation, defaultHandler }) => { if ( navigation.state.routeName === "Second" || navigation.state.routeName === "Third" ) { return null; } defaultHandler(); },})

来源：https://stackoverflow.com/questions/45639304/block-disable-tabs-in-tabnavigator-react-navigation