【发布时间】:2019-02-18 08:33:23
【问题描述】:
在这个组件上,我正在渲染 2 条路线。使用本地状态它可以完美运行,但我正在尝试使用 Redux 实现相同的效果,但我不知道如何将信号发送到 redux 以更改此状态的 index 部分。
这是以前的工作方式:
class MyComp extends Component {
state = {
index: 0,
routes: [
{ key: 'first', title: 'Drop-Off' },
{ key: 'second', title: 'Pick up' },
],
};
handleIndexChange = indexParam => {
const { navigation } = this.props;
this.setState({ index: indexParam });
if (indexParam) navigation.navigate('App2');
else navigation.navigate('App');
};
}
还有这个在渲染方法中:
render() {
return (
<TabView
navigationState={this.state}
onIndexChange={this.handleIndexChange}
/>
);
}
上面的代码按预期工作。现在我需要相同但使用 Redux,所以我可能会停止使用本地状态。 行动:
import ActionTypes from '../constants/ActionTypes';
export const indexRouteAction = index => ({
type: ActionTypes.INDEX_ROUTE,
payload: {
index,
},
});
export default indexRouteAction;
减速机:
import createReducer from '../../../redux/createReducer';
import ActionTypes from '../constants/ActionTypes';
const initialState = {
navigation: {
index: 0,
routes: [
{ key: 'first', title: 'Drop-Off' },
{ key: 'second', title: 'Pick up' },
],
},
};
const handlers = {
[ActionTypes.INDEX_ROUTE](state, action) {
return {
...state,
index: action.payload.index,
};
},
};
export default createReducer(initialState, handlers);
那么现在我可以做些什么来处理来自组件的数据呢? 我有这样的事情: 渲染方法:
render() {
const { navigationStore } = this.props;
return (
<TabView
navigationState={navigationStore}
onIndexChange={this.handleIndexChange}
/>
);
}
我这样称呼商店:
export default compose(
connect(
store => ({
navigationStore: store.homeScreen.navigation,
}),
dispatch => ({
indexRouteActionHandler: data => {
dispatch(indexRouteAction(data));
},
}),
),
)(withNavigation(TopTabView));
这是我在 onClick 函数上更改索引的函数:
handleIndexChange = indexParam => {
// BEFORE WITH STATE THIS FUNCTION WORKED WITH SETSTATE
// NOW I HAVE TO MAKE IT WORK WITH REDUX STATE
// this.setState({ index: indexParam });
const { indexRouteActionHandler, navigation } = this.props;
indexRouteActionHandler(indexParam);
if (indexParam) navigation.navigate('App2');
else navigation.navigate('App');
};
我错过了什么?
更新:
我注意到这是我在 Redux DevTools 上看到的:
{
homeScreen: {
navigation: {
index: 0,
routes: [
{
key: 'first',
title: 'Drop-Off',
routeName: 'DropOffHome'
},
{
key: 'second',
title: 'Pick up',
routeName: 'PickupHome'
}
]
},
index: 0
}
}
我看到有 2 个索引,其中一个更改其状态的索引是导航之外的索引:navigation: {...}, index: 0 我需要获取导航内部的索引:navigation: {index: 0, routes: [...]}。
【问题讨论】:
标签: javascript reactjs ecmascript-6 redux