我尝试将此应用程序作为一个项目，因为我刚刚学习了 React Native，到目前为止我没有遇到任何问题，但我一直遇到这个 Hook 问题:

Uncaught Error: Invalid hook call. Hooks can only be called inside of the body of a function component. This could happen for one of the following reasons:

1. You might have mismatching versions of React and the renderer (such as React DOM)
2. You might be breaking the Rules of Hooks
3. You might have more than one copy of React in the same app See https://reactjs.org/link/invalid-hook-call for tips about how to debug and fix this problem. at resolveDispatcher (react.development.js:1476:1) at useState (react.development.js:1507:1) at Module../App.js (App.js:11:1) at webpack_require (bootstrap:789:1) at fn (bootstrap:100:1) at Module../node_modules/expo/AppEntry.js (AppEntry.js:1:1) at webpack_require (bootstrap:789:1) at fn (bootstrap:100:1) at Object.1 (index.js:18:1) at webpack_require (bootstrap:789:1) at bootstrap:856:1 at bootstrap:856:1

React Native:

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

const Stack = createStackNavigator();
const Tab = createBottomTabNavigator();

const [password, setPassword] = useState("");
const [username, setUsername] = useState("");
const [hasUser, setUser] = useState(false);
const [error, setError] = useState("");

export const AppNavigator = () => {
  const check = hasUser;
  if (check == true) {
    return (
      <Tab.Navigator>
        <Tab.Screen name="Feed" component={FeedScreen} />
      </Tab.Navigator>
    );
  }
  if (check == false) {
    return (
      <Stack.Navigator>
        <Stack.Screen name="Login" component={LoginScreen} />
      </Stack.Navigator>
    );
  }
};
const LoginScreen = () => {
  <View style={styles.container}>
    <Text style={styles.titleLogin}>VKAW</Text>
    <View style={styles.inputs}>
      <Text style={{ color: "red" }}>{error}</Text>
      <TextInput
        placeholder="Benutzername"
        onChangeText={(usernameSet) => setUsername(usernameSet)}
        value={username}
      ></TextInput>
      <TextInput
        placeholder="Password"
        secureTextEntry={true}
        onChangeText={(passwordSet) => setPassword(passwordSet)}
        value={password}
      ></TextInput>
    </View>
    <Button title="Login" color="#ff8800" onPress={login()} />
    <StatusBar style="auto" />
  </View>;
};

const FeedScreen = () => {
  <View>
    <Text>Feed</Text>
  </View>;
};

const login = () => {
  const usernameCheck = username;
  const passwordCheck = password;
  if (usernameCheck == "test" && passwordCheck == "test") {
    setUser(true);
  } else {
    setError("Passwort oder Benutzername Falsch!");
  }
};

const App = () => {
  return (
    <NavigationContainer>
      <AppNavigator />
    </NavigationContainer>
  );
};

export default App();

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: "#fff",
    alignItems: "center",
    justifyContent: "center",
  },
  titleLogin: {
    fontSize: 30,
    fontWeight: "bold",
    color: "#ff8800",
    paddingBottom: 50,
  },
  inputs: {
    display: "flex",
    width: 150,
    paddingBottom: 50,
    justifyContent: "center",
    alignItems: "center",
  },
});