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App.js
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App.js
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import React from 'react';
import { StyleSheet, Text, View, Button, Image, Platform, StatusBar } from 'react-native';
import { AppLoading, Asset, Font } from 'expo';
import { Ionicons } from '@expo/vector-icons';
import Storage from 'react-native-storage'; // 本地持久存储的封装
import { AsyncStorage } from 'react-native';
import RootNavigation from './src/navigation/RootNavigation';
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" />}
{Platform.OS === 'android' &&
<View style={styles.statusBarUnderlay} />}
<RootNavigation />
</View>
);
}
}
componentWillMount() {
this._setStorage();
}
_setStorage = () => {
let storage = new Storage({
size: 1000,
storageBackend: AsyncStorage,
// 数据过期时间,默认一整天(1000 * 3600 * 24 毫秒),设为null则永不过期
defaultExpires: 1000 * 3600 * 24 * 7, // 过期时间 7天
// 读写时在内存中缓存数据。默认启用。
enableCache: true,
// 如果storage中没有相应数据,或数据已过期,
// 则会调用相应的sync方法,无缝返回最新数据。
// sync方法的具体说明会在后文提到
// 你可以在构造函数这里就写好sync的方法
// 或是在任何时候,直接对storage.sync进行赋值修改
// 或是写到另一个文件里,这里require引入
// sync: require('你可以另外写一个文件专门处理sync')
})
global.storage = storage;
}
_loadResourcesAsync = async () => {
// return Promise.all([
// // Asset.loadAsync([
// // require('./assets/images/robot-dev.png'),
// // require('./assets/images/robot-prod.png'),
// // ]),
// Font.loadAsync([
// // This is the font that we are using for our tab bar
// Ionicons.font,
// // We include SpaceMono because we use it in HomeScreen.js. Feel free
// // to remove this if you are not using it in your app
// // { 'space-mono': require('./assets/fonts/SpaceMono-Regular.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: '#fff',
},
statusBarUnderlay: {
height: 24,
backgroundColor: 'rgba(0,0,0,0.2)',
},
});