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Setup (aka pre-requisites)

Verifying your install

  • cd ArtistExample
  • Run yarn run jest to verify specs

Starting out

  • Run yarn start
  • Explain packager
  • What is going on with the Transpile and Compile ?
  • What parts are iOS compiled, and what is JS transpiled?
  • Run react-native run-ios to launch the project

Tada - it's your 1st RN app

That's it. Let's look at some real code. Browse the source code.

Relay

Emission Relay Setup

We're using Relay, this will take a bit of setup.

  • Add relay - yarn add react-relay@https:/alloy/relay/releases/download/v0.9.3/react-relay-0.9.3.tgz
  • Add babel-relay-plugin - yarn add babel-relay-plugin@https:/alloy/relay/releases/download/v0.9.3/babel-relay-plugin-0.9.3.tgz

Then the schema into a data folder:

  • mkdir data
  • curl https://raw.githubusercontent.com/artsy/emission/master/data/schema.graphql > data/schema.graphql
  • curl https://raw.githubusercontent.com/artsy/emission/master/data/schema.js > data/schema.js
  • curl https://raw.githubusercontent.com/artsy/emission/master/data/schema.json > data/schema.json

Then hook up the plugin:

  • Add "plugins": ["./data/schema"], to .babelrc.

First edit

  • Turn on Live Reloading and HMR
  • Turn BG white

Magic, it does it in real-time.

Making components

  • Make lib, lib/artists and lib/artists/artist.js

  • Move ArtistExample Component from index.ios.js to lib/artists/artist.js

  • Change the class to Artist, and edit the title to reflect a different component

  • Go back and nuke most of the index.ios.js make it just refer to `Artist``

    import Artist from "./lib/artist/artist"

export default class ArtistExample extends Component {
  render() {
    return (
      <Artist />
    );
  }
}

Relay Setup

Explain there are three useful bits parts of Relay:

  • Routes
  • Root Container
  • createContainer

We will talk about them as we go on, but first we need to tell Relay where Metaphysics is. So we need to set up a network layer:

import Relay from 'react-relay'

const metaphysicsURL = 'https://metaphysics-staging.artsy.net'

Relay.injectNetworkLayer(
  new Relay.DefaultNetworkLayer(metaphysicsURL, {
    headers: {
      'X-XAPP-Token': "[go to staging.artsy.net and do `sd.ARTSY_XAPP_TOKEN` in console]",
    }
  })
)

Next we need to create a Relay Route, this doesnt directly represent a URL representation, but it often can/does. E.g. in our case this will represent /artist/:artistID.

  • create lib/artist/route.js add
import Relay from 'react-relay'

export default  class ArtistRoute extends Relay.Route {
  static queries = {
    artist: (component, params) => Relay.QL`
      query {
        artist(id: $artistID) {
          ${component.getFragment('artist', params)}
        }
      }
    `,
  };

  static paramDefinitions = {
    artistID: { required: true },
  };

  static routeName = 'ArtistRoute';
}

  • Hook this up inside index.ios.js, add an import, and create instance of Route:

    import ArtistRoute from "./lib/artist/route"

const glennRoute = new ArtistRoute({
  artistID: "glenn-brown"
})

    Then change the components render function:

    export default class ArtistExample extends Component {
   render = () => <Relay.RootContainer Component={Artist} route={glennRoute} />
}

See error, that means it's trying to access a Relay Component, and we have a React component. Let's make it a Relay Component:

  • Remove the export default from the Artist class in lib/artist/artist.js

  • Add Relay fragment

export default Relay.createContainer(Artist, {
  fragments: {
    artist: () => Relay.QL`
      fragment on Artist {
        _id
        id
        name
      }
    `,
  }
})
class Artist extends Component {
  render() {
    const title = `Hello, I am ${this.props.artist.name}`
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>{title}</Text>
      </View>
    );
  }
}

Tada! 🎉

Prove the Relay concept by adding years to GraphQL and add this to the render function:

class Artist extends Component {
  render() {
    const title = `Hey ${this.props.artist.name}`
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>{title}</Text>
        <Text style={styles.welcome}>{this.props.artist.years}</Text>
      </View>
    );
  }
}

Looking Stylish!

OK, we now have the minimum we need - we got API data coming in as props. Now we want to make it look pretty.

  • Add mkdir assets, and mkdir assets/fonts
curl -L https:/artsy/Artsy-OSSUIFonts/raw/master/Pod/Assets/EBGaramond12-Italic.ttf > assets/EBGaramond12-Italic.ttf
curl -L https:/artsy/Artsy-OSSUIFonts/raw/master/Pod/Assets/EBGaramond12-Regular.ttf > assets/EBGaramond12-Regular.ttf
curl -L https:/artsy/Artsy-OSSUIFonts/raw/master/Pod/Assets/texgyreadventor-bold.ttf > assets/texgyreadventor-bold.ttf
  • edit package.json
 "rnpm": {
    "assets": ["./assets"]
  }

  • run react-native link, restart iOS app, by killing it.

  • run react-native run-ios

  • Add custom styles to the two bits of info on screen:

<Text style={styles.title}>{this.props.artist.name.toUpperCase()}</Text>
<Text style={styles.subtitle}>{this.props.artist.years}</Text>
const styles = StyleSheet.create({
  container: {
    flex: 1,
    marginTop: 20,
    alignItems: 'center',
    backgroundColor: 'white',
  },
  title: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
    fontFamily: "TeXGyreAdventor-Regular"
  },
  subtitle: {
    textAlign: 'center',
    color: '#333333',
    fontFamily: 'EBGaramond12-Regular',
    marginBottom: 5,
  },
});

And that is our styles. Covering all of the major use cases of React Native for us.