react native开发：实现点击左侧选择项，右侧显示内容的功能

react native开发：实现点击左侧选择项，右侧显示内容的功能

需求：

界面分为左右两部分，左侧为选择栏，右侧为显示的内容，点击左侧选择项，右侧显示内容的功能
如下图：

思路：

首先思考问题：

****1. 如何实现左侧栏，点击组件改变颜色？
2. 如何实现点击左侧选项，右侧显示想要内容？

如何实现左侧栏，点击组件改变颜色？

在style中通过条件判断改变样式

如何实现点击左侧选项，右侧显示想要内容？

将左侧被选中的标识，作为参数，通过props回调父组件的方法，该回调方法根据左侧标识，在右侧显示对应的内容

代码

左侧选择栏SettingMenu.js

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Dimensions,
  ScrollView,
  Text,
  TouchableOpacity,
  Image,
  View,

} from 'react-native';

const window = Dimensions.get('window');


export default class SettingMenu extends Component {


  constructor(props) {
super(props);

this.state = {
      itemSelected: '通讯方式',
    };
this._onClickItem = this._onClickItem.bind(this);

  }


  render() {


return (
      <ScrollView style={styles.contantStyle}
        showsVerticalScrollIndicator={false}>

        {/*选项菜单*/}
        {this._selectItem('通讯方式')}
        {this._selectItem('设置3G服务IP地址')}
        {this._selectItem('交易地点')}
        {this._selectItem('清空考勤记录')}
        {this._selectItem('初始化设备')}
        {this._selectItem('修改密码')}
        {this._selectItem('关于我们')}
        {this._selectItem('退出')}

      </ScrollView>
    );
  }
  _selectItem(item) {
return (
      <TouchableOpacity style={styles.itemTextView}
        onPress={() => {
this._onClickItem(item)
        }}>

        <Text style={[
          styles.itemDefaultColor,
this.state.itemSelected === item && styles.itemSelectedColor
        ]}  >
          {item}
        </Text>

      </TouchableOpacity>
    )
  }
  _onClickItem(itemTextContant) {
this.setState({
      itemSelected: itemTextContant,
    });
//传递数据到右边显示组件
this.props.onItemSelected(itemTextContant);
  }


};


const styles = StyleSheet.create({

  contantStyle: {
    backgroundColor: 'white',
  },
  itemTextView: {
    height: 60,
    width: window.width / 4,
    justifyContent: 'center',
    borderBottomColor: 'gray',
    borderBottomWidth: 1,
    marginLeft: 10,
    marginRight: 10,

  },
  item: {
    fontSize: 16,
    justifyContent: 'center',
    alignItems: 'center',
    flexDirection: 'row',
  },
  itemDefaultColor: {
    color: 'gray',
  },
  itemSelectedColor: {
    color: '#00bfff'
  }
});

父组件Setting.js

import React, { Component } from 'react';
import {
    AppRegistry,
    StyleSheet,
    Text,
    TextInput,
    Image,
    Dimensions,
    View,
    Modal,
    Button,
    PixelRatio,
    TouchableOpacity,
} from 'react-native';
import NavigationBar from 'react-native-navbar';

import LeftMenu from './SettingMenu.js';//导入 菜单 组件


const window = Dimensions.get('window');


export default class Setting extends Component {
    constructor(props) {
super(props);
this.state = {

            selectedItem: '通讯方式',
            showRightContant: '通讯方式',

        };


this._onMenuItemSelected = this._onMenuItemSelected.bind(this);


    }

    render() {

return (
            <View style={styles.flex}>

                {/*标题栏*/}
                <NavigationBar tintColor='#00bfff' title={{ title: '设置', tintColor: 'white' }} />

                {/*内容*/}
                <View style={[styles.container, styles.flexDirection]}>
                    {/*左侧选择栏*/}
                    <View style={styles.leftMenuStyle}>
                        <LeftMenu onItemSelected={this._onMenuItemSelected} />
                    </View>
                    {/*右侧显示内容*/}
                    <View style={styles.rightContantSyle}>

                        <Text>{this.state.showRightContant}</Text>
                    </View>
                </View>

            </View>
        );
    }

    _onMenuItemSelected(leftContant) {
this.setState({
            showRightContant: leftContant,
        });

    }
}

const styles = StyleSheet.create({

    flex: {
        flex: 1,
    },
    flexDirection: {
        flexDirection: 'row',
    },
    center: {
        justifyContent: 'center',
        alignItems: 'center',
    },
    leftMenuStyle: {

        borderRightColor: 'grey',
        borderRightWidth: 1,
    },
    rightContantSyle: {
        flex: 1,

    },

    container: {
        flex: 1,
        backgroundColor: '#F5FCFF',

    },

});