如何在 reactnative 上自动聚焦下一个 TextInput

我正在try 创建一个密码保护的屏幕.屏幕将使用4个数字输入作为密码.

我这样做的方式是创建一个TextInput组件，并在主屏幕中调用它4次.

我遇到的问题是，当我输入上一个TextInput的值时，TextInputs不会关注下一个.

我对所有PasscodeTextInput组件使用refs(我被告知这是一个遗留方法，但我不知道其他方法，唉).

Tried this method(without creating my own component), no luck too.

index.ios.js

import React, { Component } from 'react';
import { AppRegistry, TextInput, View, Text } from 'react-native';
import { PasscodeTextInput } from './common';

export default class ProgressBar extends Component {
  render() {
    const { centerEverything, container, passcodeContainer,  textInputStyle} = styles;
    return (
      <View style={[centerEverything, container]}>
        <View style={[passcodeContainer]}>
          <PasscodeTextInput
            autoFocus={true}
            ref="passcode1"
            onSubmitEditing={(event) => { this.refs.passcode2.focus() }} />
          <PasscodeTextInput
            ref="passcode2"
            onSubmitEditing={(event) => { this.refs.passcode3.focus() }} />
          <PasscodeTextInput
            ref="passcode3"
            onSubmitEditing={(event) => { this.refs.passcode4.focus() }}/>
          <PasscodeTextInput
            ref="passcode4" />
        </View>
      </View>
    );
  }
}

const styles = {
  centerEverything: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  container: {
    flex: 1,
    backgroundColor: '#E7DDD3',
  },
  passcodeContainer: {
    flexDirection: 'row',
  },
}

AppRegistry.registerComponent('ProgressBar', () => ProgressBar);

PasscodeTextInput.js

import React from 'react';
import {
  View,
  Text,
  TextInput,
  Dimensions
} from 'react-native';

const deviceWidth = require('Dimensions').get('window').width;
const deviceHeight = require('Dimensions').get('window').height;

const PasscodeTextInput = ({ ref, autoFocus, onSubmitEditing, onChangeText, value}) => {

  const { inputStyle, underlineStyle } = styles;

  return(
    <View>
      <TextInput
        ref={ref}
        autoFocus={autoFocus}
        onSubmitEditing={onSubmitEditing}
        style={[inputStyle]}
        maxLength={1}
        keyboardType="numeric"
        placeholderTextColor="#212121"
        secureTextEntry={true}
        onChangeText={onChangeText}
        value={value}
      />
      <View style={underlineStyle} />
    </View>
  );
}

const styles = {
  inputStyle: {
    height: 80,
    width: 60,
    fontSize: 50,
    color: '#212121',
    fontSize: 40,
    padding: 18,
    margin: 10,
    marginBottom: 0
  },
  underlineStyle: {
    width: 60,
    height: 4,
    backgroundColor: '#202020',
    marginLeft: 10
  }
}

export { PasscodeTextInput };

Update 1

index.ios.js

import React, { Component } from 'react';
import { AppRegistry, TextInput, View, Text } from 'react-native';
import { PasscodeTextInput } from './common';

export default class ProgressBar extends Component {

  constructor() {
    super()
    this.state = {
      autoFocus1: true,
      autoFocus2: false,
      autoFocus3: false,
      autoFocus4: false,
    }
  }

  onTextChanged(t) { //callback for immediate state change
    if (t == 2) { this.setState({ autoFocus1: false, autoFocus2: true }, () => { console.log(this.state) }) }
    if (t == 3) { this.setState({ autoFocus2: false, autoFocus3: true }, () => { console.log(this.state) }) }
    if (t == 4) { this.setState({ autoFocus3: false, autoFocus4: true }, () => { console.log(this.state) }) }
  }

  render() {
    const { centerEverything, container, passcodeContainer, testShit, textInputStyle } = styles;
    return (
      <View style={[centerEverything, container]}>
        <View style={[passcodeContainer]}>
          <PasscodeTextInput
            autoFocus={this.state.autoFocus1}
            onChangeText={() => this.onTextChanged(2)} />
          <PasscodeTextInput
            autoFocus={this.state.autoFocus2}
            onChangeText={() => this.onTextChanged(3)} />
          <PasscodeTextInput
            autoFocus={this.state.autoFocus3}
            onChangeText={() => this.onTextChanged(4)} />
          <PasscodeTextInput
            autoFocus={this.state.autoFocus4} />
        </View>
      </View>
    );
  }
}

const styles = {
  centerEverything: {
    justifyContent: 'center',
    alignItems: 'center',
  },
  container: {
    flex: 1,
    backgroundColor: '#E7DDD3',
  },
  passcodeContainer: {
    flexDirection: 'row',
  },
}

AppRegistry.registerComponent('ProgressBar', () => ProgressBar);