質問編集履歴
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内容編集
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File without changes
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@@ -65,4 +65,66 @@
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65
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);
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}
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67
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68
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```
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69
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---
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70
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追記①
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71
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```JS
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72
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import React, { useState } from "react";
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73
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import { View, Button, Text } from "react-native";
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74
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import { TextInput } from "react-native-gesture-handler";
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75
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+
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76
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function Item({ setText, handleMakeNew, handleDelete, i }) {
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77
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return (
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78
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<View>
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79
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<Text>{i}</Text>
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80
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<TextInput
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81
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onChange={(e) => {
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82
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setText(i, e.nativeEvent.text);
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83
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}}
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84
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/>
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85
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<View>
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86
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<Button
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87
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title="追加"
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88
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onPress={() => {
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89
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handleMakeNew();
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90
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}}
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91
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/>
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92
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<Button
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93
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title="削除"
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94
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onPress={() => {
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95
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handleDelete();
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96
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}}
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97
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/>
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98
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</View>
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99
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</View>
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100
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);
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101
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}
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102
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+
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103
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export default function TestListItem() {
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104
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const [count, setCount] = useState(1);
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105
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const [texts, setTexts] = useState({});
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106
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107
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function handleMakeNew() {
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108
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setCount((v) => v + 1);
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109
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}
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110
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function handleDelete() { //①ここで連想配列の要素を削除
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111
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setCount((v) => v - 1);
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112
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113
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}
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114
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return (
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115
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<View>
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116
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<Text>{JSON.stringify(texts)}</Text>
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117
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{[...Array(count).keys()].map((i) => (
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118
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<Item
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119
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handleMakeNew={handleMakeNew}
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120
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handleDelete={handleDelete}
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121
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setText={(i, text) => setTexts((prev) => ({ ...prev, [i]: text }))}
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122
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key={i}
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123
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i={i}
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124
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/>
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125
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))}
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126
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</View>
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127
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);
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128
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}
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129
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68
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```
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