如何在 react-native 组件中聚焦下一个输入字段

Question

我有一个名为ImageTextField的组件：

import React from 'react';
import {TextInput, View } from 'react-native';
export default class ImageTextField extends React.Component {
  render() {
    const {
      placeHolderValue, value, editable
    } = this.props;
    return (
      <View>
        <TextInput
          placeholder={placeHolderValue}
          placeholderTextColor="#b1b1b1"
          value={value}
          editable={editable}
        />
      </View>
    );
  }
}

我的屏幕：

import React from 'react';
import { StyleSheet, View, Text, TouchableOpacity} from 'react-native';
import ImageTextField from '../../custom-elements/ImageTextField';
export default class App extends React.Component {
  render() {
    return (
      <ImageTextField 
        onChangeText={text => this.onNameChange(text)}
        color={Colors.textFieldBlack}
        placeHolderValue="Name"
        value={this.state.name}
        autoCapitalize="words"
      />
      <ImageTextField
        onChangeText={text => this.onEmailChange(text)}
        color={Colors.textFieldBlack}
        placeHolderValue="E-mail"
        value={this.state.email}
        keyboardType='email-address'
      />
      <ImageTextField
        onChangeText={text => this.onPhoneChange(text)}
        color={Colors.textFieldBlack}
        placeHolderValue="Phone"
        value={this.state.phone}
        keyboardType="phone-pad"
      />
    );
  }
}

在上面的代码中，我有我在屏幕中使用的 ImageTextField 组件，我想聚焦下一个字段，如果用户按键盘中的下一个键，则需要跳转到第二个字段。

Answer 1

添加一个 prop，它将检索输入对 ImageTextField 组件的引用。所以你的渲染函数应该看起来像：

render() {
const {
  placeHolderValue, value, editable, inputRef
} = this.props;
return (
  <View>
    <TextInput
      placeholder={placeHolderValue}
      placeholderTextColor="#b1b1b1"
      value={value}
      editable={editable}
      ref={inputRef}
    />
  </View>
);
}

然后，您的应用组件将如下所示：

render() {
return (
  <ImageTextField 
    onChangeText={text => this.onNameChange(text)}
    color={Colors.textFieldBlack}
    placeHolderValue="Name"
    value={this.state.name}
    autoCapitalize="words"
    onSubmitEditing={() => this.emailAddress.focus()}
  />
  <ImageTextField
    onChangeText={text => this.onEmailChange(text)}
    color={Colors.textFieldBlack}
    placeHolderValue="E-mail"
    value={this.state.email}
    keyboardType='email-address'
    inputRef={ref => this.emailAddress = ref}
    onSubmitEditing={() => this.phoneNumber.focus()}
  />
  <ImageTextField
    onChangeText={text => this.onPhoneChange(text)}
    color={Colors.textFieldBlack}
    placeHolderValue="Phone"
    value={this.state.phone}
    keyboardType="phone-pad"
    inputRef={ref => this.phoneNumber = ref}
  />
);
}

Answer 2

组件名称 = MyTextInput

render() {
return (
<View>
<TextInput
  onChangeText={this.props.onChangeText}
  placeholder="some text"
  value={this.state.value}
  ref={this.props.inputRef}
  onSubmitEditing={this.props.onSubmitEditing}
/>
  </View>
);
}

然后，您的应用组件将如下所示：

<MyTextInput 
    onChangeText={text => this.onNameChange(text)}
    color={Colors.textFieldBlack}
    placeHolderValue="Name"
    value={this.state.name}
    autoCapitalize="words"
    onSubmitEditing={() => this.email.focus()}
  />
  <MyTextInput 
    onChangeText={text => this.onNameChange(text)}
    color={Colors.textFieldBlack}
    placeHolderValue="email"
    value={this.state.name}
    autoCapitalize="words"
    inputRef={ref => this.email = ref}
    onSubmitEditing={() => alert('submitted')}
  />