单击使用react-native时如何更改图像和文本颜色？

Question

我正在使用TouchableHighlight,但我只能使用underlayColor更改背景颜色.但是如何改变其他内容呢？

Answer 1

您可以使用样式更改所有内容.就像是:

'use strict';

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

var  colors = ['#ddd', '#efefef', 'red', '#666', 'rgba(0,0,0,.1)', '#ededed'];
var backgroundcolors = ['green', 'black', 'orange', 'blue', 'purple', 'pink'];

var SampleApp = React.createClass({

  getInitialState() {
    return {
        color: 'orange',
      backgroundColor: 'rgba(0,0,0,.1)'
    }
  },

  _changeStyle() {
    var color = colors[Math.floor(Math.random()*colors.length)];
    var backgroundColor = backgroundcolors[Math.floor(Math.random()*backgroundcolors.length)];
    this.setState({
        color: color,
      backgroundColor: backgroundColor
    })
  },

  render: function() {
    return (
      <View style={styles.container}>
        <TouchableHighlight 
        onPress={ () => this._changeStyle() }
        style={{ backgroundColor: this.state.backgroundColor, height: 60, flexDirection: 'row', alignItems:'center', justifyContent: 'center' }}>
                <Text style={{ fontSize: 22, color: this.state.color }}>CHANGE COLOR</Text>
        </TouchableHighlight>

        <TouchableHighlight style={{ backgroundColor: 'red', height: 60, flexDirection: 'row', alignItems:'center', justifyContent: 'center' }}>
          <Text style={{ color: 'white', fontSize:22 }} >Click Me</Text>
        </TouchableHighlight>
      </View>
    );
  }
});

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

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

我已经建立了几个按钮的示例项目在这里,并放置下面的代码.希望这可以帮助!

https://rnplay.org/apps/k_6rtg

'use strict';

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

var  colors = ['#ddd', '#efefef', 'red', '#666', 'rgba(0,0,0,.1)', '#ededed'];
var backgroundcolors = ['green', 'black', 'orange', 'blue', 'purple', 'pink'];

var SampleApp = React.createClass({

  getInitialState() {
    return {
        color: 'orange',
      backgroundColor: 'rgba(0,0,0,.1)'
    }
  },

  _changeStyle() {
    var color = colors[Math.floor(Math.random()*colors.length)];
    var backgroundColor = backgroundcolors[Math.floor(Math.random()*backgroundcolors.length)];
    this.setState({
        color: color,
      backgroundColor: backgroundColor
    })
  },

  render: function() {
    return (
      <View style={styles.container}>
        <TouchableHighlight 
        onPress={ () => this._changeStyle() }
        style={{ backgroundColor: this.state.backgroundColor, height: 60, flexDirection: 'row', alignItems:'center', justifyContent: 'center' }}>
                <Text style={{ fontSize: 22, color: this.state.color }}>CHANGE COLOR</Text>
        </TouchableHighlight>

        <TouchableHighlight style={{ backgroundColor: 'red', height: 60, flexDirection: 'row', alignItems:'center', justifyContent: 'center' }}>
          <Text style={{ color: 'white', fontSize:22 }} >Click Me</Text>
        </TouchableHighlight>
      </View>
    );
  }
});

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

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

Answer 2

这个答案假设你想在按下按钮时改变颜色:

使用TouchableWithoutFeedback并定义自己的onPressIn和onPressOut函数来更改文本颜色.

<TouchableWithoutFeedback onPressIn={this.colorText}  onPressOut={this.resetText}> 
  <Text style={[styles.textColored()]}>MyText</Text>
</TouchableWithoutFeedback>

colorText: function() {
  this.setState({textColored: true});
},
resetText: function() {
  this.setState({textColored: false});
},
textColored: function() {
  if(this.state.textColored) {
    return styles.textColored;
  } else {
    return styles.textNormal;
  }
}

Answer 3

使用TouchableHighlight，您可以像这样

state = { selected: false };

setSelected(selected: boolean) {
    this.setState({ selected: selected });
}

textStyle() {
    return this.state.selected ? styles.textSelected : styles.text;
}

然后在渲染功能

<TouchableHighlight
    underlayColor={Theme.palette.accent}
    onPress={() => onPress()}
    onShowUnderlay={() => this.setSelected(true)}
    onHideUnderlay={() => this.setSelected(false)}
>
    <Text style={this.textStyle()}>{text}</Text>
</TouchableHighlight>