运行截图
最近在学习React的架构，看了很火的Redux，然而学习Redux的过程异常痛苦。
于是乎发现了Redux作者推荐的另一种状态管理库，Mobx
unhappy with redux? try mobx //Redux作者的原话
用Mobx做状态管理真的是爽爆了，简单易懂，大大提升编码效率，替代redux的首选,废话不多说，进入正题。
1.初始化项目
首先创建一个新的React Native项目，打开终端输入
react-native init ReactNativeMobx
项目创建成功后，安装mobx和mobx-react
cd ReactNativeMobx
npm i mobx mobx-react --save
接下来在根目录下创建名为app的文件夹，在app文件夹下创建名为mobx的文件夹，在mobx文件夹下创建listStore.js，在app文件夹下创建App.js(程序首页)和NewItem.js(程序二级界面)如下图
Snip20161227_3.png
2.代码部分
listStore.js的代码：
import {observable} from 'mobx'
let index = 0
class ObservableListStore {
@observable list = []
addListItem (item) {
this.list.push({
name: item,
items: [],
index
})
index++
}
removeListItem (item) {
console.log('item:::', item)
this.list = this.list.filter((l) => {
return l.index !== item.index
})
}
addItem(item, name) {
this.list.forEach((l) => {
if (l.index === item.index) {
l.items.push(name)
}
})
}
}
const observableListStore = new ObservableListStore()
export default observableListStore
上面代码中
1.引用observable
2.创建ObservableListStore类
3.@observable list[]，监听list的变化
4.三个方法，添加列表，删除列表，添加一条数据
5.导出ObservableListStore
接下来写入口index代码,凭你的喜好打开index.android.js或者index.ios.js，
import React, { Component } from 'react'
import App from './app/App'
import ListStore from './app/mobx/listStore'
import {
AppRegistry,
Navigator
} from 'react-native'
class ReactNativeMobX extends Component {
renderScene (route, navigator) {
return <route.component {...route.passProps} navigator={navigator} />
}
configureScene (route, routeStack) {
if (route.type === 'Modal') {
return Navigator.SceneConfigs.FloatFromBottom
}
return Navigator.SceneConfigs.PushFromRight
}
render () {
return (
<Navigator
configureScene={this.configureScene.bind(this)}
renderScene={this.renderScene.bind(this)}
initialRoute={{
component: App,
passProps: {
store: ListStore
}
}} />
)
}
}
AppRegistry.registerComponent('ReactNativeMobx', () => ReactNativeMobX)
以上重点为Navigator通过passProps将ListStore传入，其余代码为Navigator的初始化。
接下来写我们程序首页App.js的代码
import React, { Component } from 'react'
import { View, Text, TextInput, TouchableHighlight, StyleSheet } from 'react-native'
import {observer} from 'mobx-react/native'
import NewItem from './NewItem'
@observer
class TodoList extends Component {
constructor () {
super()
this.state = {
text: '',
showInput: false
}
}
toggleInput () {
this.setState({ showInput: !this.state.showInput })
}
addListItem () {
this.props.store.addListItem(this.state.text)
this.setState({
text: '',
showInput: !this.state.showInput
})
}
removeListItem (item) {
this.props.store.removeListItem(item)
}
updateText (text) {
this.setState({text})
}
addItemToList (item) {
this.props.navigator.push({
component: NewItem,
type: 'Modal',
passProps: {
item,
store: this.props.store
}
})
}
render() {
const { showInput } = this.state
const { list } = this.props.store
return (
<View style={{flex:1}}>
<View style={styles.heading}>
<Text style={styles.headingText}>My List App</Text>
</View>
{!list.length ? <NoList /> : null}
<View style={{flex:1}}>
{list.map((l, i) => {
return <View key={i} style={styles.itemContainer}>
<Text
style={styles.item}
onPress={this.addItemToList.bind(this, l)}>{l.name.toUpperCase()}</Text>
<Text
style={styles.deleteItem}
onPress={this.removeListItem.bind(this, l)}>Remove</Text>
</View>
})}
</View>
{!showInput && <TouchableHighlight
underlayColor='transparent'
onPress={
this.state.text === '' ? this.toggleInput.bind(this)
: this.addListItem.bind(this, this.state.text)
}
style={styles.button}
>
<Text style={styles.buttonText}>
{this.state.text === '' && '+ New List'}
{this.state.text !== '' && '+ Add New List Item'}
</Text>
</TouchableHighlight>}
{showInput && <View style={{flexDirection: 'row'}}>
<TextInput
style={styles.input}
onChangeText={(text) => this.updateText(text)} />
<TouchableHighlight
style={styles.sureBtn}
onPress={
this.state.text === '' ? this.toggleInput.bind(this)
: this.addListItem.bind(this, this.state.text)
} >
<Text>确定</Text>
</TouchableHighlight>
</View>}
</View>
);
}
}
const NoList = () => (
<View style={styles.noList}>
<Text style={styles.noListText}>No List, Add List To Get Started</Text>
</View>
)
const styles = StyleSheet.create({
itemContainer: {
borderBottomWidth: 1,
borderBottomColor: '#ededed',
flexDirection: 'row',
justifyContent:'space-between'
},
item: {
color: '#156e9a',
fontSize: 18,
flex: 1,
padding: 20
},
deleteItem: {
padding: 20,
color: 'rgba(240,1,7,1.0)',
fontWeight: 'bold',
marginTop: 3
},
button: {
height: 70,
justifyContent: 'center',
alignItems: 'center',
borderTopWidth: 1,
borderTopColor: '#156e9a'
},
buttonText: {
color: '#156e9a',
fontWeight: 'bold'
},
heading: {
height: 80,
justifyContent: 'center',
alignItems: 'center',
borderBottomWidth: 1,
borderBottomColor: '#156e9a'
},
headingText: {
color: '#156e9a',
fontWeight: 'bold'
},
input: {
flex:1,
height: 70,
backgroundColor: '#f2f2f2',
padding: 20,
color: '#156e9a'
},
noList: {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
},
noListText: {
fontSize: 22,
color: '#156e9a'
},
sureBtn: {
width: 70,
height: 70,
justifyContent: 'center',
alignItems: 'center',
borderTopWidth: 1,
borderColor: '#ededed'
},
})
export default TodoList
二级界面NewItem.js代码
import React, { Component } from 'react'
import { View, Text, StyleSheet, TextInput, TouchableHighlight } from 'react-native'
class NewItem extends Component {
constructor (props) {
super(props)
this.state = {
newItem: ''
}
}
addItem () {
if (this.state.newItem === '') return
this.props.store.addItem(this.props.item, this.state.newItem)
this.setState({
newItem: ''
})
}
updateNewItem (text) {
this.setState({
newItem: text
})
}
render () {
const { item } = this.props
return (
<View style={{flex: 1}}>
<View style={styles.heading}>
<Text style={styles.headingText}>{item.name}</Text>
<Text
onPress={this.props.navigator.pop}
style={styles.closeButton}>×</Text>
</View>
{!item.items.length && <NoItems />}
{item.items.length ? <Items items={item.items} /> : <View />}
<View style={{flexDirection: 'row'}}>
<TextInput
value={this.state.newItem}
onChangeText={(text) => this.updateNewItem(text)}
style={styles.input} />
<TouchableHighlight
onPress={this.addItem.bind(this)}
style={styles.button}>
<Text>Add</Text>
</TouchableHighlight>
</View>
</View>
)
}
}
const NoItems = () => (
<View style={styles.noItem}>
<Text style={styles.noItemText}>No Items, Add Items To Get Started</Text>
</View>
)
const Items = ({items}) => (
<View style={{flex: 1, paddingTop: 10}}>
{items.map((item, i) => {
return <Text style={styles.item} key={i}>• {item}</Text>
})
}
</View>
)
const styles = StyleSheet.create({
heading: {
height: 80,
justifyContent: 'center',
alignItems: 'center',
borderBottomWidth: 1,
borderBottomColor: '#156e9a'
},
headingText: {
color: '#156e9a',
fontWeight: 'bold'
},
input: {
height: 70,
backgroundColor: '#ededed',
padding: 20,
flex: 1
},
button: {
width: 70,
height: 70,
justifyContent: 'center',
alignItems: 'center',
borderTopWidth: 1,
borderColor: '#ededed'
},
closeButton: {
position: 'absolute',
right: 17,
top: 18,
fontSize: 36
},
noItem: {
flex: 1,
justifyContent: 'center',
alignItems: 'center'
},
noItemText: {
fontSize: 22,
color: '#156e9a'
},
item: {
color: '#156e9a',
padding: 10,
fontSize: 20,
paddingLeft: 20
}
})
export default NewItem
以上，所有代码直接复制粘贴就OK
