如何解决 route.params undefined in react native screens typescript

Question

我在下面有这个，我从 API 中获取国家名称，并使用 routes 在屏幕上显示它们。现在，我想将 item.country 显示为 headerTitle。但是，我收到 route.params. 的 undefined 错误，我该如何解决这个问题？

LocationDataScreen.tsx

function LocationDataScreen({ route, navigation }) {
  const { item } = navigation.state.params || {};  
  const countryName = item.country;
  return (
    <View style={styles.container}>
      <Text>{countryName}</Text>
      <Text>{item.cases}</Text>
    </View>
  );
}

ItemView.tsx

const ItemView = ({ item }) => {
    return (
      <RectButton
        onPress={() =>
          navigate("LocationDataScreen", { item: item, name: item.country })
        }
      >
        <Text style={[styles.itemStyle, { textTransform: "capitalize" }]}>
          {item.id}
          {item.country.toUpperCase()}
        </Text>
      </RectButton>
    );
  };

App.tsx

<AppStack.Navigator initialRouteName="SearchScreen">
  <AppStack.Screen name="SearchScreen" component={SearchScreen} />
  <AppStack.Screen
          name="LocationDataScreen"
          component={LocationDataScreen}
          options={({ route }) => ({
            headerLargeTitle: true,
            title: route.params.item,
          })}
        />

Answer 1

你应该像下面那样做

options={({route}) => ({
            headerLargeTitle: true,
            title: route.params.name,
          })}

您必须像下面那样传递名称

navigation.navigate("LocationDataScreen",{name:item.name});

确保您具有如下设置以访问参数

import { createStackNavigator } from '@react-navigation/stack';

type RootStackParamList = {
  SearchScreen: undefined;
  LocationDataScreen: { name: string };
};

const AppStack = createStackNavigator<RootStackParamList>();

Answer 2

问题只是您以错误的方式将参数传递给 LocationDataScreen.tsx。

改用这个：

ItemView

const ItemView = ({ item }) => {
    return (
      <RectButton
        onPress={() =>
          navigate("LocationDataScreen", { ...item })
        }
      >
        <Text style={[styles.itemStyle, { textTransform: "capitalize" }]}>
          {item.id}
          {item.country.toUpperCase()}
        </Text>
      </RectButton>
    );
  };

LocationDataScreen.tsx

function LocationDataScreen({ route, navigation }) {
  const { country, cases } = route.params

  return (
    <View style={styles.container}>
      <Text>{country}</Text>
      <Text>{cases}</Text>
    </View>
  );
}

我假设您在这一行 const ItemView = ({ item }) => { 中的 item 看起来像这样。

item: {
   country: 'Italy',
   cases: 10
}

如果您可以添加 api 回复 here。添加后请在评论中告诉我。同时在评论中分享link。

如何解决 route.params undefined in react native screens typescript

How to solve route.params undefined in react native screens typescript

navigation

typescript

react-router

react-native

stack-navigator