React实现TabBar切换与高亮功能

// TabBar 数据
const tabItems = [
  {
    title: "首页",
    icon: "icon-ind",
    path: "/home",
  },
  {
    title: "找房",
    icon: "icon-findHouse",
    path: "/home/list",
  },
  {
    title: "资讯",
    icon: "icon-infom",
    path: "/home/news",
  },
  {
    title: "我的",
    icon: "icon-my",
    path: "/home/profile",
  },
];

// 渲染 TabBar.Item
  renderTabBarItem() {
    return tabItems.map((item) => (
      <TabBar.Item
        title={item.title}
        key={item.title}
        // 默认图标
        icon={<i className={`iconfont ${item.icon}`} />}
        // 选中图标
        selectedIcon={<i className={`iconfont ${item.icon}`} />}
        // 是否选中
        selected={this.state.selectedTab === item.path}
        // 点击菜单项时，进行路由切换
        onPress={() => {
          this.setState({
            selectedTab: item.path,
          });

          // 路由切换
          this.props.history.push(item.path);
        }}
      />
    ));
  }

render() {
    // console.log(this.props.location.pathname)
    return (
      <div className="home">
        {/* 2.3 渲染子路由 */}
        <Route path="/home/news" component={News} />
        <Route exact path="/home" component={Index} />
        <Route path="/home/list" component={HouseList} />
        <Route path="/home/profile" component={Profile} />
        {/* TabBar */}

        <TabBar tintColor="#21b97a" noRenderContent={true} barTintColor="white">
          {this.renderTabBarItem()}
        </TabBar>
      </div>
    );
  }

// 组件接收到新的props（此处，实际上是路由信息）就会触发该钩子函数
  componentDidUpdate(prevProps) {
    // prevProps 上一次的props，此处也就是上一次的路由信息
    // this.props 当前最新的props，此处也就是最新的路由信息
    // 注意：在该钩子函数中更新状态时，一定要在 条件判断 中进行，否则会造成递归更新的问题
    if (prevProps.location.pathname !== this.props.location.pathname) {
      // 此时，就说明路由发生切换了
      this.setState({
        selectedTab: this.props.location.pathname,
      });
    }
  }

state = {
    // 默认选中的TabBar菜单项
    selectedTab: this.props.location.pathname,
  };

selected={this.state.selectedTab === item.path}

onPress={() => {
          this.setState({
            selectedTab: item.path,
          });

          // 路由切换
          this.props.history.push(item.path);
        }}

import React from "react";
import { BrowserRouter as Router, Route, Redirect } from "react-router-dom";
import Home from "./pages/Home";
import CityList from "./pages/CityList";

function App() {
  return (
    <Router>
      <div className="App">
        <Route
          path="/"
          exact
          render={() => <Redirect to="/home" />}
        />
        <Route path="/home" component={Home} />
        <Route path="/city" component={CityList} />
      </div>
    </Router>
  );
}

export default App;