【iOS开发】(六)react Native 路由嵌套传参与框架原理（完）20240423

【iOS开发】(六)react Native 路由嵌套传参与框架原理（完）20240423
感谢拉钩教育的教学。

（五）我们介绍了四种路由导航，这一节我们介绍他们的嵌套传参和框架的整体原理。到这里，大家已经能用RN框架进行一些小项目的开发了。

一 路由嵌套

import {Text, StyleSheet, View, Button} from 'react-native';
import React, {Component} from 'react';
import {createStackNavigator} from '@react-navigation/stack';
import {createBottomTabNavigator} from '@react-navigation/bottom-tabs';
import { NavigationContainer } from '@react-navigation/native';

const Tab = createBottomTabNavigator();

function FeedScreen(props) {
  // 跳转方法prop.navigation.navigate参数是路由名称也就是Stack.Screen name
  return (
    <View style={[styles.container]}>
      <Text style={[styles.text]}>HomeScreen</Text>
      <Button
        title={'跳到Profile页面'}
        onPress={() => props.navigation.navigate('Profile')}
      />
      <Button
        title={'跳到Settings页面'}
        onPress={() => props.navigation.navigate('Settings')}
      />
    </View>
  );
}

function MessagesScreen(props) {
  return (
    <View style={[styles.container]}>
      <Text style={[styles.text]}>NewsScreen</Text>
    </View>
  );
}

function ProfileScreen(props) {
  return (
    <View style={[styles.container]}>
      <Text style={[styles.text]}>ProfileScreen</Text>
    </View>
  );
}

function SettingsScreen(props) {
  return (
    <View style={[styles.container]}>
      <Text style={[styles.text]}>SettingsScreen</Text>
    </View>
  );
}

function Home() {
  return (
    <Tab.Navigator>
      <Tab.Screen name="Feed" component={FeedScreen} />
      <Tab.Screen name="Messages" component={MessagesScreen} />
    </Tab.Navigator>
  );
}

const Stack = createStackNavigator();

export default class Index extends Component {
  render() {
    return (
      <NavigationContainer>
      <Stack.Navigator>
        <Stack.Screen
          name="Home"
          component={Home}
          options={{headerShown: false}}
        />
        <Stack.Screen name="Profile" component={ProfileScreen} />
        <Stack.Screen name="Settings" component={SettingsScreen} />
      </Stack.Navigator>
      </NavigationContainer>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  text: {
    fontSize: 40,
  },
});

二 路由传参

import {Text, View, Button} from 'react-native';
import React from 'react';
import {createStackNavigator} from '@react-navigation/stack';
import {NavigationContainer} from '@react-navigation/native'; 
 // 导入 NavigationContainer

function HomeScreen({navigation}) {
  return (
    <View style={{flex: 1, alignItems: 'center', justifyContent: 'center'}}>
      <Text>首页</Text>
      <Button
        title="前往详情"
        onPress={() => {
          navigation.navigate('Details', {
            itemId: 86,
            otherParam: '这里可以是任何你想要的内容',
          });
        }}
      />
    </View>
  );
}

function DetailsScreen({route, navigation}) {
  const {itemId, otherParam} = route.params;
  return (
    <View style={{flex: 1, alignItems: 'center', justifyContent: 'center'}}>
      <Text>详情页</Text>
      <Text>itemId: {JSON.stringify(itemId)}</Text>
      <Text>otherParam: {JSON.stringify(otherParam)}</Text>
      <Button
        title="再次前往详情"
        onPress={() =>
          navigation.push('Details', {
            itemId: Math.floor(Math.random() * 100),
          })
        }
      />
      <Button title="返回首页" onPress={() => navigation.navigate('Home')} />
      <Button title="返回" onPress={() => navigation.goBack()} />
    </View>
  );
}

const Stack = createStackNavigator();

export default function Index() {
  return (
    <NavigationContainer> 
      <Stack.Navigator>
        <Stack.Screen name="Home" component={HomeScreen} />
        <Stack.Screen name="Details" component={DetailsScreen} />
      </Stack.Navigator>
    </NavigationContainer>
  );
}

三 架构原理

从启动过程，来理解架构设计