Native Navigation might make you end up structuring your app a little bit differently than how the React Native project encourages you to do.
With Native Navigation, "Screens" are the top level react components of your app, and we have to register each of them individually. We have found that this leads to a natural way of splitting up your code base, and also has some performance advantages by preventing all of your code from getting executed at app start.
The typical project structure we recommend is something like this:
root/
├── components/
├── screens/
│ ├── FooScreen.js
│ └── BarScreen.js
├── routes.js
└── index.js
In this case, "Screens" are separated from "Components", and there is a top level index.js and routes.js
file.
Our routes.js file might look something like this:
export const FOO = 'MyApp/Foo';
export const BAR = 'MyApp/Bar';routes.js is just a set of constants that correspond to screens. You can think of them like URLs
for different pages of a website.
Our index.js file might look something like this:
import Navigator from 'native-navigation';
import { FOO, BAR } from './routes';
Navigator.registerScreen(FOO, () => require('./screens/FooScreen'));
Navigator.registerScreen(BAR, () => require('./screens/BarScreen'));The index.js file is the index file that you should have as the entry point to your JavaScript
bundle that the React Native bridge uses.
There is nothing special that one needs to do to integrate redux into an app using Native Navigation, however, since NativeNavigation results in splitting up every screen of your app into separate root views and registering each separately, there are ways to reduce the boilerplate of redux integration.
One way we recommend doing this is by registering all of your screens with a custom registerScreen
function, rather than calling Navigator.registerScreen directly. This allows you to add custom
options to the call that are specific to your app or internal infrastructure.
Redux is a good simple example of this, where we may want to add a getStore option to the
registerScreen method that automatically registers the screen with the redux store provided in
context.
One could accomplish this like:
import React from 'react';
import { Provider } from 'react-redux';
import Navigator from 'native-navigation';
// This ensures that we can use `() => require('./foo')` as a `getScreen` or `getStore` option,
// even if `foo.js` is an ES6 module. It's not really important to this example.
function unwrapDefaultExport(module) {
if (module != null && module.__esModule === true) {
return module.default;
}
return module;
}
// provided a `getScreen` function and a `getStore` function, we want to return a new function
// that returns a new react component that renders the old one, but with the redux store provided
// through context.
function wrapScreenGetter(route, getScreen, { getStore }) {
class ConnectedScreen extends React.Component {
render() {
const Screen = unwrapDefaultExport(getScreen());
const store = unwrapDefaultExport(getStore());
return (
<Provider store={store}>
<Screen {...this.props} />
</Provider>
);
}
}
// customize the display name for better React dev tools interop.
ConnectedScreen.displayName = `ConnectedScreen(${route})`;
return () => {
// invoking this here ensures that our original `getScreen` function gets called, which we want
// to happen to make sure that `Navigator.preload` still does meaningful work.
getScreen();
return ConnectedScreen;
};
}
export default function registerConnectedScreen(route, getScreen, options = {}) {
const getWrapper = wrapScreenGetter(route, getScreen, options);
return Navigator.registerScreen(route, getWrapper, options);
}Then you would register screens like in the following example:
// index.js
import registerConnectedScreen from './utils/registerConnectedScreen';
registerConnectedScreen(
'SomeScreen',
() => require('./screens/SomeScreen'),
{
getStore: () => require('./path/to/redux/store'),
},
);