小编Nav*_*ngh的帖子

我想在路由参数中设置一个默认值，如果没有从我们以前做过的其他屏幕发送任何内容

let phot0 = this.props.navigation.getParam("photo","empty");

在 react Navigation 5.x 中做什么我的代码是..（第 5 行的困难）

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

export default function Home({ route, navigation }) {
  const { photo } = route.params;
  return (
    <View style={styles.container}>
      <Image
        resizeMode="center"
        style={styles.imageHolder}
        source={photo === "empty" ? require("../assets/email.png") : photo}
      />
      <Button
        title="take photo"
        style={styles.button}
        onPress={() => navigation.navigate("Camera")}
      />
    </View>
  );
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center", …