Always show backbutton, and exit app on back.

[sneerin]

Is it possible always show back button? For my case, I just need to exit react activity. But for other cases it could be a menu as well, wasn't able to find it in the documentation. please advise.
Should it be state changes, totally custom navbar?

[mcabs3]

The back button will show only when you have a Scene to navigate back to. this is based on react-navigation. If you are looking to always have a back button to perform some sort of action, you can try the onLeft features of the Scene or indeed implement your own custom navBar.

[sneerin]

I was looking here:
renderLeftButton
not sure if it works for v4, but anyway thanks for suggestion

[mcabs3]

Sure, if you need further help, let me know.

[luisfuertes]

I have that router:

			<Router sceneStyle={{backgroundColor:'white'}}>
				<Scene key='lightbox' lightbox>
					<Scene key='root'>
						<Scene key='Login' initial={true} component={Login} hideNavBar/>
						<Scene key='User' component={User} />
					</Scene>
				</Scene>
			</Router>

From Login scene i do Actions.User() and in User scene, react-native-router-flux show back button but when i press it, app crash with: _this.props.navigation.goBack is not a function instead do a simple pop

[luisfuertes]

If i add onLeft={(e) => console.log("e: ", e)} prop to scene, console.log isnt printed, but when i press back button do pop() correctly...