react-native - 更改 underlineColorAndroid on Focus for TextInput in react-native

Question

类似于 Focus style for TextInput in react-native ，我正在尝试更改 textInput 的属性 underlineColorAndroid。

我正在使用 React-Native 0.28.0

OnFocus，该属性不会改变。如何将下划线更改为不同颜色的 onFocus？

我的示例代码如下:

'use strict';

import React, { Component } from 'react';

import {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  TextInput,
  ScrollView
} from 'react-native';

class RNPlayground extends Component {
  constructor(props) {
    super(props);
    this.state = {
      hasFocus: false
    }
  }

  _onBlur() {
    this.setState({hasFocus: false});
    }

  _onFocus() {
    this.setState({hasFocus: true});
    }

  _getULColor(hasFocus) {
    console.error(hasFocus);
    return (hasFocus === true) ? 'pink' : 'violet';
  }

  render() {
    console.error("this.state=");
    console.error(this.state);
    console.error("this.state.hasFocus=");
    console.error(this.state.hasFocus);

    return (
      <View style={styles.container}>
        <ScrollView>
          <TextInput
            placeholder="textInput"
            onBlur={ () => this._onBlur() }
            onFocus={ () => this._onFocus() }
            style={styles.instructions}
            underlineColorAndroid={this._getULColor(this.state.hasFocus)}/>
                </ScrollView>
        <TextInput>Some sample text</TextInput>
      </View>
    );
  }
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 28,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    fontSize: 19,
    marginBottom: 5,
  }

});

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

Answer 1

好吧，你的代码是正确的，它应该可以正常工作。
Here is working example

请停止对这个答案投反对票。不幸的是 rnplay 服务不再可用，就像这个例子一样。或者投反对票，但要解释你的观点。