Hideable tabs with BACK action consumption fix for TabRouter

hidden-tabs-backfix

fixed BACK action consumption when TabRouter is not back eligible

Merged upstream v1.5.0

Merged upstream v1.5.0 release into the feature branch

Feat hideable tabs in TabBar

In this fork of react-navigation (1.0.0-beta.27), tabs created in a TabNavigator can now be hidden from the TabBar by setting the { hiddenTabs: ['MyTab'] } config.

To hide a tab by default, you can write:

const tabNav = TabNavigator({
  FirstTab: { screen: firstScreen },
  SomeTab: { screen: secondScreen },
}, {
  hiddenTabs: ['SomeTab']
});

Hidden tabs can be made visible again by dispatching the showTab action, like so:

this.props.navigation.dispatch(
  NavigationActions.showTab({ tabRouteName: 'SomeTab' })
);

Tabs can also be hidden programatically with the hideTabaction:

this.props.navigation.dispatch(
  NavigationActions.hideTab({ tabRouteName: 'SomeTab' })
);