質問編集履歴
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内容編集
test
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test
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@@ -133,3 +133,127 @@
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```
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---
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追記①
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```JS
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import React, { useState } from "react";
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import { View, Button, Text } from "react-native";
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import { TextInput } from "react-native-gesture-handler";
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function Item({ setText, handleMakeNew, handleDelete, i }) {
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return (
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<View>
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<Text>{i}</Text>
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<TextInput
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onChange={(e) => {
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setText(i, e.nativeEvent.text);
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}}
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/>
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<View>
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<Button
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title="追加"
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onPress={() => {
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handleMakeNew();
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}}
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/>
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<Button
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title="削除"
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onPress={() => {
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handleDelete();
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}}
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/>
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</View>
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</View>
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);
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}
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export default function TestListItem() {
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const [count, setCount] = useState(1);
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const [texts, setTexts] = useState({});
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function handleMakeNew() {
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setCount((v) => v + 1);
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}
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function handleDelete() { //①ここで連想配列の要素を削除
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setCount((v) => v - 1);
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}
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return (
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<View>
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<Text>{JSON.stringify(texts)}</Text>
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{[...Array(count).keys()].map((i) => (
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<Item
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handleMakeNew={handleMakeNew}
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handleDelete={handleDelete}
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setText={(i, text) => setTexts((prev) => ({ ...prev, [i]: text }))}
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key={i}
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i={i}
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/>
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))}
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</View>
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);
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}
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```
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