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首页 > 解决方案 > TypeError: (0, _native.useTheme) 不是函数。（在 '(0, _native.useTheme)()' 中，'(0, _native.useTheme)' 未定义）

react-native - TypeError: (0, _native.useTheme) 不是函数。（在 '(0, _native.useTheme)()' 中，'(0, _native.useTheme)' 未定义）

问题描述

我创建了一个drawerNavigator，现在我正在尝试向标题添加一个图标。问题是当我添加 HeaderButton 时出现此错误：

组件异常

在 navigationOptions 我尝试同时使用 HeaderButton 和 CustomHeaderButton 但它不起作用，我似乎无法找出问题所在。

这是我的代码：

页眉按钮.js

import React from "react";
import { HeaderButton } from "react-navigation-header-buttons";
import { Ionicons } from "@expo/vector-icons";

const CustomHeaderButton = (props) => {
  return (
    <HeaderButton
      {...props}
      IconComponent={Ionicons}
      iconSize={23}
      color="black"
    />
  );
};

export default CustomHeaderButton;

WelcomeScreen.js

import React from "react";
import { View, Text, StyleSheet, ImageBackground, Image } from "react-native";
import MainButton from "../components/MainButton";
import Colors from "../constants/Colors";
import { HeaderButtons, Item } from "react-navigation-header-buttons";
import HeaderButton from "../components/HeaderButton";

const WelcomeScreen = (props) => {
  return (
    <ImageBackground
      source={require("../assets/images/tsl.jpg")}
      style={styles.backgroundImage}
    >
      <Image
        source={require("../assets/images/slogan.jpg")}
        style={styles.logo}
      />
      <View style={styles.buttonContainer}>
        <MainButton
          onPress={() => {
            props.navigation.navigate({
              routeName: "UserLogin",
            });
          }}
        >
          User Login
        </MainButton>
        <MainButton
          onPress={() => {
            props.navigation.navigate({ routeName: "DriverLogin" });
          }}
        >
          Driver Login
        </MainButton>
        <View style={styles.newAccountContainer}>
          <Text style={styles.newAccountText}>Don't have an account?</Text>
        </View>
        <View style={styles.registerContainer}>
          <MainButton style={styles.registerButton}>Register now</MainButton>
        </View>
      </View>
    </ImageBackground>
  );
};

WelcomeScreen.navigationOptions = {
  headerLeft: (
    <HeaderButtons HeaderButtonComponent={HeaderButton}>
      <Item title="Menu" iconName="ios-menu" />
    </HeaderButtons>
  ),
};

谢谢！

标签： react-nativeexporeact-native-navigation

解决方案

对于每个会出错的人（在Max 的课程中​​，视频 173 :)）：

TypeError: (0, _native.useTheme) 不是函数。（在 '(0, _native.useTheme)()' 中，'(0, _native.useTheme)' 未定义）

尝试添加npm i --save @react-navigation/native

如果没有帮助，删除 node_modules 和 package-lock.json，检查并更新你的 package.json 到正确的版本。这是我的依赖项：

"dependencies": {
    "@expo/vector-icons": "^12.0.5",
    "@react-navigation/native": "^5.9.4",
    "expo": "40.0.0",
    "expo-app-loading": "^1.0.1",
    "expo-font": "~8.4.0",
    "expo-status-bar": "~1.0.3",
    "react": "16.13.1",
    "react-dom": "16.13.1",
    "react-native": "https://github.com/expo/react-native/archive/sdk-40.0.1.tar.gz",
    "react-native-gesture-handler": "~1.8.0",
    "react-native-reanimated": "~1.13.0",
    "react-native-screens": "~2.15.2",
    "react-native-web": "^0.13.12",
    "react-navigation": "^4.4.4",
    "react-navigation-drawer": "^2.7.0",
    "react-navigation-header-buttons": "^6.3.1",
    "react-navigation-stack": "^2.10.4",
    "react-navigation-tabs": "^2.11.0",
    "react-redux": "^7.2.4",
    "redux": "^4.1.0",
    "redux-devtools-extension": "^2.13.9"

完成此操作后，只需运行npm install。

我希望它会帮助某人。学习和享受！=）

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