App.js

import React from "react";
import { Platform, StatusBar, StyleSheet, View } from "react-native";
import { AppLoading, Asset, Font } from "expo";

import AppNavigator from "./navigation/AppNavigator";

export default class App extends React.Component {
  state = {
    isLoadingComplete: false
  };

  render() {
    if (!this.state.isLoadingComplete && !this.props.skipLoadingScreen) {
      return (
        <AppLoading
          startAsync={this._loadResourcesAsync}
          onError={this._handleLoadingError}
          onFinish={this._handleFinishLoading}
        />
      );
    } else {
      return (
        <View style={styles.container}>
          {Platform.OS === "ios" && <StatusBar barStyle="default" />}
          <AppNavigator />
        </View>
      );
    }
  }

  _loadResourcesAsync = async () => {
    return Promise.all([
      Font.loadAsync({
        "Karla-Bold": require("./assets/fonts/Karla-Bold.ttf"),
        "Karla-Bold-Italic": require("./assets/fonts/Karla-BoldItalic.ttf"),
        "Karla-Regular": require("./assets/fonts/Karla-Regular.ttf"),
        "Karla-Italic": require("./assets/fonts/Karla-Italic.ttf"),
        icomoon: require("./assets/fonts/icomoon.ttf")
      })
    ]);
  };

  _handleLoadingError = error => {
    // In this case, you might want to report the error to your error
    // reporting service, for example Sentry
    console.warn(error);
  };

  _handleFinishLoading = () => {
    this.setState({ isLoadingComplete: true });
  };
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#FAFAFA"
  }
});