React Native 开发豆瓣评分（二）路由配置

路由管理使用官方推荐的 React Navigation;

配置环境

安装相关依赖

yarn add react-navigation react-native-gesture-handler

Link 原生依赖

react-native link react-native-gesture-handler

修改 MainActivity.java

package com.reactnativedouban;

import com.facebook.react.ReactActivity;
+ import com.facebook.react.ReactActivityDelegate;
+ import com.facebook.react.ReactRootView;
+ import com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView;

public class MainActivity extends ReactActivity {

@Override
protected String getMainComponentName() {
    return "ReactNativeDouban";
}

+  @Override
+  protected ReactActivityDelegate createReactActivityDelegate() {
+    return new ReactActivityDelegate(this, getMainComponentName()) {
+      @Override
+      protected ReactRootView createRootView() {
+        return new RNGestureHandlerEnabledRootView(MainActivity.this);
+      }
+    };
+  }
}

编辑路由相关页面

测试环境是否搭建成功

将如下 js 代码替换到 App.js 中，点击 Home Click Me 进行了页面跳转即表示环境搭建成功。

import React from "react";
import { View, Text } from "react-native";
import { createStackNavigator, createAppContainer } from "react-navigation";
class Home extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, alignItems: "center", justifyContent: "center" }}>
        <Text onPress={() => this.props.navigation.push('Detail')}>Home Click Me</Text>
      </View>
    );
  }
}
class Detail extends React.Component {
  render() {
    return (
      <View style={{ flex: 1, alignItems: "center", justifyContent: "center" }}>
        <Text>Detail Screen</Text>
      </View>
    );
  }
}
const AppNavigator = createStackNavigator({Home,Detail});
export default createAppContainer(AppNavigator);

创建页面、配置路由

暂时创建主要的几个页面，后续有需求在进行创建，开发目录如下：

...
├─src                  主要开发目录
│ ├─router.js          管理路由
│ ├─App.js             入口页
│ └─pages              页面目录，暂时页面较少，不必对页面进行分类管理
│    ├─index.js        首页
│    ├─list.js         列表页
│    ├─detail.js       详情页
│    ├─center.js       个人中心
│    ├─rank.js         排行榜页面
│    └─rankDetail.js   排行榜详情页面
├─index.js
...

编辑 App.js

import React, { Component } from 'react';
import Router from './router';

export default class App extends Component {
  render() {
    return (
      <Router />
    );
  }
};

编辑 router.js

基本的结构如下：

import { createBottomTabNavigator, createAppContainer, createStackNavigator } from 'react-navigation';
import React from 'react';

import Index from './pages/index';
import Rank from './pages/rank';
import Center from './pages/center';
import List from './pages/list';
import Detail from './pages/detail';
import RankDetail from './pages/rankDetail';

const components = {
    List,
    Detail,
    RankDetail
}

const tabBarConfig = {
    tabBarOptions: {
        activeTintColor: '#fd0',
        inactiveTintColor: '#666',
        style: {
            backgroundColor: '#fafafa',
        }
    }
}

const TabNavigator = createBottomTabNavigator({
    Index: {
        screen: Index,
        navigationOptions: {
            title: '首页'
        }
    },
    Rank: {
        screen: Rank,
        navigationOptions: {
            title: '榜单'
        }
    },
    Center: {
        screen: Center,
        navigationOptions: {
            title: '我的'
        }
    },
}, tabBarConfig);

const AppNavigator = createStackNavigator({
    Tab: TabNavigator,
    ...components
});

export default createAppContainer(AppNavigator);

页面内容如下：

import React from "react";
import { View, Text } from "react-native";

export default class Home extends React.Component {
render() {
    return (
    <View style={{ flex: 1, alignItems: "center", justifyContent: "center" }}>
        <Text onPress={() => this.props.navigation.push('Detail')}>Home Click Me</Text>
    </View>
    );
}
}

此时页面路由跳转是上下切换跳转，希望换成左右切换，修改createStackNavigator配置，如下，这样默认就是左右跳转，使用 this.props.navigation.push('Detail', { transition: 'bottom' }) 这样的带 transition 参数为 bottom 的跳转则为上下切换动画。

const AppNavigator = createStackNavigator({
    Tab: TabNavigator,
    ...components
}, {
    transitionConfig: () => ({
        screenInterpolator: sceneProps => {
            const { layout, position, scene } = sceneProps;
            const { index, route } = scene;
            const { initWidth, initHeight } = layout;

            const params = route.params || {};
            const transition = params.transition || 'left';
            let transform = {};

            if (transition === 'bottom') {
                transform.translateY = position.interpolate({
                    inputRange: [index - 1, index, index + 1],
                    outputRange: [initHeight, 0, 0]
                });
            } else {
                transform.translateX = position.interpolate({
                    inputRange: [index - 1, index, index + 1],
                    outputRange: [initWidth, 0, 0]
                });
            }
            const opacity = position.interpolate({
                inputRange: [index - 1, index - 0.99, index],
                outputRange: [0, 1, 1],
            });

            return { opacity, transform: [transform] };
        }
    })
});

添加 Tabbar 图片，修改 tabBarConfig 配置：

const imgs = [
    require('./assets/index.png'),
    require('./assets/index-full.png'),
    require('./assets/rank.png'),
    require('./assets/rank-full.png'),
    require('./assets/center.png'),
    require('./assets/center-full.png')
];

const tabName = ['Index', 'Rank', 'Center'];

const tabBarConfig = {
    defaultNavigationOptions: ({ navigation }) => ({
        tabBarIcon: ({ focused }) => {
            const { routeName } = navigation.state;
            let imgIndex = focused ? tabName.indexOf(routeName) * 2 + 1 : tabName.indexOf(routeName) * 2;
            return <Image source={imgs[imgIndex]} style={{  25, height: 25 }} />;
        }
    }),
    tabBarOptions: {
        activeTintColor: '#00b600',
        inactiveTintColor: '#666',
        labelStyle: {
            fontSize: 15
        },
        style: {
            backgroundColor: '#fafafa',
        }
    }
}

效果如下：

至此，路由算是完成了，下节介绍项目中如何引入 redux。