Question

我有三个TouchableHighlight元素包含三个视图（彼此相邻排列）。 Onpress我想更改样式（backgroundColor）和视图图像（按下的视图将变为活动状态）。

有效视图 - backgroundColor <View style={styles.circle}>应该变为红色＆＃39;和图片来源应该是＆＃39; arrow-win-active.png＆＃39; <Image source={require('../images/arrow-win.png')} style={styles.arrowWin}></Image>
其他两个观点保持不变

最好的方法是什么？

以下是截图：

到目前为止，这是我的代码：

import React from 'react'
import {
    View,
    ListView,
    ScrollView,
    StyleSheet,
    Image,
    TouchableHighlight,
} from 'react-native'

const changeStyle = () => {
    console.log('change style')
}

const appView = (game, date) =>
<ScrollView style={styles.container}>
    <View style={styles.step}>
        <View style={{flex:1}}>
            <View style={styles.pickContainer}>
                <TouchableHighlight onPress={() => changeStyle()} style={{flex:1}}>
                    <View style={styles.pickWrapper}>
                        <View style={styles.circle}>
                            <Image source={require('../images/arrow-win.png')} style={styles.arrowWin}></Image>
                        </View>
                    </View>
                </TouchableHighlight>

                <TouchableHighlight style={{flex:1}}>
                    <View style={styles.pickWrapper}>
                        <View style={styles.circle}>
                            <Image source={require('../images/arrow-draw.png')} style={styles.arrowDraw}></Image>
                        </View>
                    </View>
                </TouchableHighlight>

                <TouchableHighlight style={{flex:1}}>
                    <View style={styles.pickWrapper}>
                        <View style={styles.circle}>
                            <Image source={require('../images/arrow-win.png')} style={styles.arrowWin}></Image>
                        </View>
                    </View>
                </TouchableHighlight>
            </View>
        </View>
    </View>
</ScrollView>

const styles = StyleSheet.create({
container: {
    flex: 1,
    backgroundColor: '#e1e1e1'
},
step: {
    backgroundColor: '#ffffff',
    borderRadius: 4,
    borderLeftWidth: 5,
    flex: 1,
    marginLeft: 10,
    marginRight: 10,
    marginBottom: 10,
    paddingLeft: 15,
    paddingRight: 10,
    paddingTop: 15,
    paddingBottom: 15,
    shadowOffset: {
        width: 0,
        height: 2,
    },
    shadowRadius: 2,
    shadowOpacity: 0.2,
    shadowColor: 'black',
    textAlign: 'center',
},
heading: {
    textAlign: 'center',
    fontWeight: 'bold',
    fontSize: 15,
    color: '#333333',
},
pickContainer: {
    flex:1,
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
},
pickWrapper: {
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'space-around',
    alignItems: 'center',
    marginTop: 10,
},
circle: {
    height: 60,
    borderRadius: 30,
    width: 60,
    backgroundColor: '#eeeeee',
    alignItems: 'center',
    justifyContent: 'center',
},
arrowWin: {
    width: 34,
    height: 28,
},
arrowDraw: {
    width: 18,
    height: 8,
},
})

export default appView

Answer 1

您必须将AppView更改为基于类的组件，因为您必须访问state。

import React. {Component} from 'react'
import {
  View,
  ListView,
  ScrollView,
  StyleSheet,
  Image,
  TouchableHighlight,
} from 'react-native'

class AppView extends Component {
  state = {
    isPlayer1ButtonActive: false,
    isDrawButtonActive: false,
    isPlayer2ButtonActive: false,
  }

  activateButton = buttonToActivate => {
    const newState = Object.assign(
      {}, 
      {
        isPlayer1ButtonActive: false,
        isDrawButtonActive: false,
        isPlayer2ButtonActive: false,
      }, 
      {[buttonToActivate]: true},
    )
    this.setState(newState);
  }

  render() {
    const {isPlayer1ButtonActive, isDrawButtonActive, isPlayer2ButtonActive} = this.state

    return (
      <ScrollView style={styles.container}>
        <View style={styles.step}>
          <View style={{flex:1}}>
            <View style={styles.pickContainer}>
              <TouchableHighlight onPress={() => activateButton('isPlayer1ButtonActive')} style={{flex:1}}>
                <View style={styles.pickWrapper}>
                  <View style={[styles.circle, isPlayer1ButtonActive && styles.circleActive]}>
                    <Image 
                      source={isPlayer1ButtonActive ? require('../images/arrow-win-active.png') : require('../images/arrow-win.png')} 
                      style={styles.arrowWin} 
                    />
                  </View>
                </View>
              </TouchableHighlight>

              <TouchableHighlight onPress={() => activateButton('isDrawButtonActive')}  style={{flex:1}}>
                <View style={styles.pickWrapper}>
                  <View style={[styles.circle, isDrawButtonActive && styles.circleActive]}>
                    <Image 
                      source={isDrawButtonActive ? require('../images/arrow-draw-active.png') : require('../images/arrow-draw.png')} 
                      style={styles.arrowDraw} 
                    />
                  </View>
                </View>
              </TouchableHighlight>

              <TouchableHighlight onPress={() => activateButton('isPlayer2ButtonActive')}  style={{flex:1}}>
                <View style={styles.pickWrapper}>
                  <View style={[styles.circle, isPlayer2ButtonActive && styles.circleActive]}>
                    <Image 
                      source={isPlayer2ButtonActive ? require('../images/arrow-win-active.png') : require('../images/arrow-win.png')} 
                      style={styles.arrowWin} 
                    />
                  </View>
                </View>
              </TouchableHighlight>
            </View>
          </View>
        </View>
      </ScrollView>
    )
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#e1e1e1'
  },
  step: {
    backgroundColor: '#ffffff',
    borderRadius: 4,
    borderLeftWidth: 5,
    flex: 1,
    marginLeft: 10,
    marginRight: 10,
    marginBottom: 10,
    paddingLeft: 15,
    paddingRight: 10,
    paddingTop: 15,
    paddingBottom: 15,
    shadowOffset: {
      width: 0,
      height: 2,
    },
    shadowRadius: 2,
    shadowOpacity: 0.2,
    shadowColor: 'black',
    textAlign: 'center',
  },
  heading: {
    textAlign: 'center',
    fontWeight: 'bold',
    fontSize: 15,
    color: '#333333',
  },
  pickContainer: {
    flex:1,
    flexDirection: 'row',
    justifyContent: 'space-between',
    alignItems: 'center',
  },
  pickWrapper: {
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'space-around',
    alignItems: 'center',
    marginTop: 10,
  },
  circle: {
    height: 60,
    borderRadius: 30,
    width: 60,
    backgroundColor: '#eeeeee',
    alignItems: 'center',
    justifyContent: 'center',
  },
  circleActive: {
    backgroundColor: 'red',
  },
  arrowWin: {
    width: 34,
    height: 28,
  },
  arrowDraw: {
    width: 18,
    height: 8,
  },
})

export default AppView

React Native - 如何更改onPress视图的样式和图像

1 个答案: