javascript - react native : functions are not valid as a react child . 如果您返回组件而不是 ，则可能会发生这种情况

Question

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

export default function App() {
  const [enteredGoal, setEnteredGoal] = useState("");

  const [courseGoals, setCourseGoals] = useState([]);

  const goalInputHandler = enteredText => {
    setEnteredGoal(enteredText);
  };

  const addGoalHandler = () => {
    //console.log(enteredGoal);

    setCourseGoals(currentGoals => [...currentGoals, enteredGoal]);
  };
  return (
    <View style={styles.screen}>
      <View style={styles.inputContainer}>
        <TextInput
          placeholder="Course Goal"
          style={styles.input}
          onChangeText={goalInputHandler}
          value={enteredGoal}
        />
        <Button title="Add" onPress={addGoalHandler} />
      </View>
      <View>{(courseGoals.map = goal => <Text key={goal}>{goal}</Text>)}</View>
    </View>
  );
}

const styles = StyleSheet.create({
  screen: {
    padding: 50
  },
  inputContainer: {
    flexDirection: "row",
    justifyContent: "space-between",
    alignItems: "center"
  },

  input: {
    width: "70%",
    borderBottomColor: "black",
    borderWidth: 1,
    padding: 10
  }
});

拜托，我已经与这个错误作斗争一个多星期了。任何帮助将不胜感激。我实际上正在遵循使用 expo 在 youtube 上构建 React Native 应用程序的教程。

Answer 1

问题是您的 map 调用，将其更改为:

<View>{courseGoals.map(goal => <Text key={goal}>{goal}</Text>)}</View>

否则，您正在做的就是尝试重新定义courseGoals.map。