更改所选标签栏项目的底部边框颜色 [英] Change bottom border color of selected tab bar item

问题描述

我在 react-native 中有以下代码

I have the following code in react-native

import React, {Component} from 'react';
import {TabNavigator} from 'react-navigation';
import {View} from 'react-native';

class Home extends Component {

  static navigationOptions = {
        title:'Home',
        tabBarLabel:'First'
  };

  render() {
    return <View></View>;
  }

}

const tabOptions = {

    tabBarOptions: {
        activeTintColor:'white',
        inactiveTintColor:'#D3D3D3',
        style:{
            backgroundColor:'green',
            borderTopWidth:1,
            borderTopColor:'#D3D3D3'
        },
        tabBarSelectedItemStyle: {
            borderBottomWidth: 2,
            borderBottomColor: 'red',
        },
    },
}

const ProductNavigator = TabNavigator({
  First: {screen: Home},
  Second:{screen: Home}
},
tabOptions
);
export default ProductNavigator;

这是在 Android 模拟器中呈现时的样子

This is what it looks like when rendered in Android emulator

我希望黄色下划线改为红色下划线.但是我对 tabBarSelectedItemStyle 声明红色下划线的规则没有得到承认.如何使选定标签栏项目的下划线变为红色?

I want the yellow underline to be RED underline instead. But my rules for tabBarSelectedItemStyle that declare a red underline are not being acknowledged. How do I make the underline of selected tab bar items to be red?

推荐答案

要设置 TabNavigator 所选项目的指示器的样式，您可以使用 indicatorStyle.

To style TabNavigator selected item's indicator you can use indicatorStyle.

indicatorStyle - 标签指示器的样式对象(标签底部的线).

indicatorStyle - Style object for the tab indicator (line at the bottom of the tab).

示例

const tabOptions = {    
    tabBarOptions: {
        activeTintColor:'white',
        inactiveTintColor:'#D3D3D3',
        style:{
            backgroundColor:'green',
            borderTopWidth:1,
            borderTopColor:'#D3D3D3'
        },
        indicatorStyle: {
            backgroundColor: 'red',
        },
    },
}

const ProductNavigator = TabNavigator({
  First: {screen: Home},
  Second:{screen: Home}
}, tabOptions);

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