|
1 |
| -import {MMKVLoader, useMMKVStorage} from 'react-native-mmkv-storage'; |
2 |
| -const storage = new MMKVLoader().withInstanceID('settings').initialize(); |
| 1 | +import React, {useCallback} from 'react'; |
| 2 | +import { |
| 3 | + SafeAreaView, |
| 4 | + StatusBar, |
| 5 | + StyleSheet, |
| 6 | + Text, |
| 7 | + TouchableOpacity, |
| 8 | + View, |
| 9 | +} from 'react-native'; |
| 10 | +import MMKVStorage, {create} from 'react-native-mmkv-storage'; |
3 | 11 |
|
4 |
| -storage.setString('key_1', 'value_1'); |
5 |
| -storage.setInt('key_2', 2); |
6 |
| -storage.removeItem('key_2'); // let's say we no longer need this key |
| 12 | +const Button = ({title, onPress}) => { |
| 13 | + return ( |
| 14 | + <TouchableOpacity style={styles.button} onPress={onPress}> |
| 15 | + <Text style={{color: 'white'}}>{title}</Text> |
| 16 | + </TouchableOpacity> |
| 17 | + ); |
| 18 | +}; |
7 | 19 |
|
8 |
| -export default function App() { |
9 |
| - const [reactive_key_1] = useMMKVStorage('key_1', storage); |
10 |
| - const [reactive_key_2] = useMMKVStorage('key_2', storage); |
11 |
| - const [reactive_key_3] = useMMKVStorage('key_3', storage); // this key doesn't exist |
| 20 | +const storage = new MMKVStorage.Loader().withEncryption().initialize(); |
| 21 | +const useStorage = create(storage); |
12 | 22 |
|
13 |
| - const key_1 = storage.getString('key_1'); |
14 |
| - const key_2 = storage.getInt('key_2'); |
15 |
| - const key_3 = storage.getString('key_3'); // this key doesn't exist |
| 23 | +const App = () => { |
| 24 | + const [user, setUser] = useStorage('user', 'robert'); |
| 25 | + const [age, setAge] = useStorage('age', 24); |
16 | 26 |
|
17 |
| - // issue #1 - why reactive_key_1 is becoming undefined? |
18 |
| - console.log(`key_1: ${key_1} - reactive_key_1: ${reactive_key_1}`); // key_1: value_1 - reactive_key_1: undefined |
| 27 | + const getUser = useCallback(() => { |
| 28 | + let users = ['andrew', 'robert', 'jack', 'alison']; |
| 29 | + let _user = |
| 30 | + users[ |
| 31 | + users.indexOf(user) === users.length - 1 ? 0 : users.indexOf(user) + 1 |
| 32 | + ]; |
| 33 | + return _user; |
| 34 | + }, [user]); |
19 | 35 |
|
20 |
| - // issue #2 - why we have two different default values for same key? |
21 |
| - console.log(`key_2: ${key_2} - reactive_key_2: ${reactive_key_2}`); // key_2: null - reactive_key_2: undefined |
| 36 | + const buttons = [ |
| 37 | + { |
| 38 | + title: 'setString', |
| 39 | + onPress: () => { |
| 40 | + storage.setString('user', getUser()); |
| 41 | + }, |
| 42 | + }, |
| 43 | + { |
| 44 | + title: 'setUser', |
| 45 | + onPress: () => { |
| 46 | + setUser(getUser()); |
| 47 | + }, |
| 48 | + }, |
| 49 | + { |
| 50 | + title: 'setAge', |
| 51 | + onPress: () => { |
| 52 | + setAge(age => { |
| 53 | + console.log(age); |
| 54 | + return age + 1; |
| 55 | + }); |
| 56 | + }, |
| 57 | + }, |
| 58 | + ]; |
22 | 59 |
|
23 |
| - // issue #2 - why we have two different default values for same key? |
24 |
| - console.log(`key_3: ${key_3} - reactive_key_3: ${reactive_key_3}`); // key_3: null - reactive_key_3: undefined |
| 60 | + return ( |
| 61 | + <> |
| 62 | + <StatusBar barStyle="dark-content" /> |
| 63 | + <SafeAreaView style={styles.container}> |
| 64 | + <View style={styles.header}> |
| 65 | + <Text style={styles.headerText}> |
| 66 | + I am {user} and I am {age} years old. |
| 67 | + </Text> |
| 68 | + </View> |
25 | 69 |
|
26 |
| - storage.indexer.strings.getKeys().then(r => console.log('keys: ', r)); |
| 70 | + {buttons.map(item => ( |
| 71 | + <Button key={item.title} title={item.title} onPress={item.onPress} /> |
| 72 | + ))} |
| 73 | + </SafeAreaView> |
| 74 | + </> |
| 75 | + ); |
| 76 | +}; |
27 | 77 |
|
28 |
| - return null; |
29 |
| -} |
| 78 | +export default App; |
| 79 | + |
| 80 | +const styles = StyleSheet.create({ |
| 81 | + container: { |
| 82 | + alignItems: 'center', |
| 83 | + flex: 1, |
| 84 | + backgroundColor: 'white', |
| 85 | + }, |
| 86 | + header: { |
| 87 | + width: '100%', |
| 88 | + backgroundColor: '#f7f7f7', |
| 89 | + marginBottom: 20, |
| 90 | + justifyContent: 'center', |
| 91 | + alignItems: 'center', |
| 92 | + paddingVertical: 50, |
| 93 | + }, |
| 94 | + button: { |
| 95 | + width: '95%', |
| 96 | + height: 50, |
| 97 | + backgroundColor: 'orange', |
| 98 | + justifyContent: 'center', |
| 99 | + alignItems: 'center', |
| 100 | + borderRadius: 10, |
| 101 | + marginBottom: 10, |
| 102 | + }, |
| 103 | + headerText: {fontSize: 40, textAlign: 'center', color: 'black'}, |
| 104 | +}); |
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