React Native - Expo: fontFamily 'SimpleLineIcons' is not a system font and has not been loaded through Font.loadAsync

Okay, so I finally managed to solve this issue.

The problem was that iOS and Android apparently require different names for the fonts you want to load.

The simple-line-icons that i loaded in only worked for iOS and so on Android i got this error: fontFamily 'SimpleLineIcons' is not a system font and has not been loaded through Font.loadAsync.

I ended up loading both the simple-line-icons and the SimpleLineIcons, pointing to the same directory like so:

componentDidMount() {
    this.loadAssetsAsync()
  }

  loadAssetsAsync = async () => {
    await Font.loadAsync({
      amaticBold: require('./assets/fonts/amaticSC-Bold.ttf'),
      indieFlower: require('./assets/fonts/indieFlower.ttf'),
      'Material Icons': require('@expo/vector-icons/fonts/MaterialIcons.ttf'),
      'MaterialIcons': require('@expo/vector-icons/fonts/MaterialIcons.ttf'),
      'SimpleLineIcons': require('@expo/vector-icons/fonts/SimpleLineIcons.ttf'),
      'simple-line-icons': require('@expo/vector-icons/fonts/SimpleLineIcons.ttf')
    })
    this.setState({ fontLoaded: true })
  }

  render() {
    const store = createStore(reducers, {}, applyMiddleware(ReduxThunk))

    if (!this.state.fontLoaded) {
      return <AppLoading />
    }

    return (
      <Provider store={store}>
        <Router />
      </Provider>
    )
  }

This admittedly ugly solution solved my issue for now. Make sure you really type exactly like the error tells you to. If the error is: fontFamily 'MyAwesomeFont' is not a system font... Then you really need to name it:

Font.loadAsync({
    'MyAwesomeFont': require('./path/to/MyAwesomeFont.ttf')
})

Hope this helps anyone out there.

I had the same issue and I found that changing the font name to the one you named can solve issue:

// Before
'my-awesome-font': require('./path/to/my-awesome-font.ttf')

// After
'MyAwesomeFont': require('./path/to/my-awesome-font.ttf')

It may be the dash sign that cannot be used.