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App.js
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import React from "react";
import { Platform, StatusBar, StyleSheet, View } from "react-native";
import { AppLoading } from "expo";
import { FontAwesome, MaterialIcons } from "@expo/vector-icons";
import RootNavigation from "./src/screen/RootNavigation";
import cacheAssetsAsync from "./src/util/cache";
export default class AppContainer extends React.Component {
state = {
appIsReady: false
};
componentWillMount() {
this._loadAssetsAsync();
}
/**
* Description 首先加载所有的资源
* @returns {Promise.<void>}
* @private
*/
async _loadAssetsAsync() {
try {
await cacheAssetsAsync({
images: [require("./assets/images/navigation/header_background.png")],
fonts: [
FontAwesome.font,
MaterialIcons.font,
{ "space-mono": require("./assets/fonts/SpaceMono-Regular.ttf") }
]
});
} catch (e) {
console.warn(
"There was an error caching assets (see: main.js), perhaps due to a " +
"network timeout, so we skipped caching. Reload the app to try again."
);
console.log(e.message);
} finally {
this.setState({ appIsReady: true });
}
}
render() {
if (this.state.appIsReady) {
return (
<View style={styles.container}>
{Platform.OS === "ios" && <StatusBar barStyle="default" />}
{Platform.OS === "android" &&
<View style={styles.statusBarUnderlay} />}
<RootNavigation />
</View>
);
} else {
return <AppLoading />;
}
}
}
const styles = StyleSheet.create({
container: {
flex: 1,
backgroundColor: "#fff"
},
statusBarUnderlay: {
height: 24,
backgroundColor: "rgba(0,0,0,0.2)"
}
});