反应原生的TextInput焦点样式

在React Native中,如何在获得焦点时更改textInput的样式？说我有类似的东西

class MyInput extends Component {
    render () {
        return <TextInput style={styles.textInput} />;
    }
};

const stylesObj = {
    textInput: {
        height: 50,fontSize: 15,backgroundColor: 'yellow',color: 'black',}
};
const styles = StyleSheet.create(stylesObj);

我想将焦点上的背景颜色更改为绿色.

This documentation让我相信解决方案是这样的

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

    render () {
        return (<TextInput
            style={this.state.hasFocus ? styles.focusedTextInput : styles.textInput}
            onFocus={this.setFocus.bind(this,true)}
            onBlur={this.setFocus.bind(this,false)}
        />);
    }

    setFocus (hasFocus) {
        this.setState({hasFocus});
    }
};

const stylesObj = {
    textInput: {
        height: 50,}
};
const styles = StyleSheet.create({
    ...stylesObj,focusedTextInput: {
        ...stylesObj,backgroundColor: 'green',}
});

忽略样式结构中的潜在错误,这会被认为是处理它的正确方法吗？这对我来说似乎非常冗长.

您可以通过传入onFocus和onBlur事件来实现这一点,以便在聚焦和模糊时设置和取消设置样式：

onFocus() {
    this.setState({
        backgroundColor: 'green'
    })
  },onBlur() {
    this.setState({
      backgroundColor: '#ededed'
    })
  },

然后,在TextInput中执行以下操作：

<TextInput 
    onBlur={ () => this.onBlur() }
    onFocus={ () => this.onFocus() }
    style={{ height:60,backgroundColor: this.state.backgroundColor,color: this.state.color }}  />

我已经建立了一个完整的工作项目here.我希望这有帮助！

https://rnplay.org/apps/hYrKmQ

'use strict';

var React = require('react-native');
var {
  AppRegistry,StyleSheet,Text,View,TextInput
} = React;

var SampleApp = React.createClass({

  getInitialState() {
    return {
        backgroundColor: '#ededed',color: 'white'
    }
  },onFocus() {
        this.setState({
        backgroundColor: 'green'
    })
  },render: function() {
    return (
      <View style={styles.container}>
       <TextInput 
        onBlur={ () => this.onBlur() }
        onFocus={ () => this.onFocus() }
        style={{ height:60,color: this.state.color }}  />
      </View>
    );
  }
});

var styles = StyleSheet.create({
  container: {
    flex: 1,marginTop:60
  }
});

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