Creating a TabNavigator with dynamic tabs

Question

I'm relatively sure I found out it isn't possible, but I want to make sure there isn't a way.

The app in question starts off with an AppNavigator StackNavigator.

export const AppNavigator = StackNavigator({
    Login: {
        screen: Login,
        navigationOptions: ({navigation}) => ({
            title: 'Aanmelden',
            params: {
                nuke: navigation.state.params && !!navigation.state.params.nuke,
            },
        }),
    },
    Main: {
        screen: DynamicTabBar,
        navigationOptions: ({navigation}) => ({
            title: 'Follow-up',
        }),
    },
}, {
    mode: 'modal',
    headerMode: 'none',
});

export class AppWithNavigationState extends React.Component {
    constructor(props) {
        super(props);
    }

    render() {
        return <AppNavigator navigation={addNavigationHelpers({ dispatch: this.props.dispatch, state: this.props.navigationReducer })} />
    }
}

AppWithNavigationState.propTypes = {
    dispatch: React.PropTypes.func.isRequired,
    navigationReducer: React.PropTypes.object.isRequired,
};

const mapStateToProps = state => ({
    navigationReducer: state.navigationReducer,
});

export default connect(mapStateToProps)(AppWithNavigationState);

So far so good, it's just that the DynamicTabBar is should not be 'rendered' until the user has logged in (i.e. navigating from Login to Main).

Here's why

const Tabs = TabNavigator({
        Start: {
            screen: UserStackNavigator,
            navigationOptions: {
                tabBarIcon: (<Icon
                    type="font-awesome"
                    name="users"
                    color="#dddddd"
                    size={20}
                />),
            },
        },
        ...Account.User.CanEnter ? {
            ConditionalTab: {
                screen: ConditionalScreen,
                navigationOptions: {
                    tabBarIcon: (<Icon
                        type="font-awesome"
                        name="recycle"
                        color="#dddddd"
                        size={20}
                    />),
                },
            }} : {},
        Settings: {
            screen: Settings,
            navigationOptions: {
                tabBarIcon: (<Icon
                    type="font-awesome"
                    name="cog"
                    color="#dddddd"
                />),
            }
        }
    },{
        ...TabNavigator.Presets.AndroidTopTabs,
        tabBarPosition: "bottom",
        tabBarOptions: {
            activeTintColor: '#eaeb65',
            showIcon: true,
            showLabel: false,
            style: { backgroundColor: '#333' },
        }
    });

export default class DynamicTabBar extends React.Component {
    constructor(props) {
        super(props);
    }
    render() {
        return <Tabs navigation={this.props.navigation} />;
    }
}
DynamicTabBar.router = Tabs.router;

...Account.User.CanEnter ? { is always false because the TabNavigator is rendered before the user has logged in and Account is filled. A failed attempt, it seams.

I wanted to populate Tabs inside componentWillMount, but then I can't set the static router: DynamicTabBar.router = Tabs.router;

Any ideas on how to fix this?

Answer 1

I know this is old, but AFAICT there is no blessed way to do this still, in 2019. Here is the solution I came up with, and I think it's fairly simple.

Basically, I specify a custom tabBarComponent with a custom getButtonComponent method that either renders the button or not based on the current user. If the user shouldn't see the nav item, then it renders an empty view, which has the effect of hiding the navigation item.

import { createBottomTabNavigator } from 'react-navigation'
import { BottomTabBar } from 'react-navigation-tabs'

class TabBar extends React.Component {
  render() {
    return (
      <BottomTabBar
        {...this.props}
        getButtonComponent={this.getButtonComponent}
      />
    )
  }

  getButtonComponent({ route }) {
    if (route.key === 'Other') {
      return () => <View /> // a view that doesn't render its children
    } else {
      return null // use the default nav button component
    }
  }
}

const AppNav = createBottomTabNavigator(
  {
    Home: HomeStack,
    Other: OtherScreen,
  },
  {
    tabBarComponent: TabBar,
  }
)