我不善于解释代码是如何工作的。
但你需要的是1
state
打电话
selectedIndex
剩下的就是你需要用
选择索引
是匹配显示
active
形象
示例代码可能如下所示:
import React, { Component } from 'react';
import RN from 'react-native';
export default class App extends Component {
constructor(props) {
super(props);
this.state={
selectedIndex:0,
//you can change every urlActive and urlInactive url to your needed image
tabList:[
{label:'tab 1', urlActive:'https://livelovely.com/static/images/full-listing/icon-modal-success%402x.png', urlInactive:'https://icon2.kisspng.com/20180823/ioc/kisspng-traffic-sign-image-traffic-code-no-symbol-inactive-symbol-www-pixshark-com-images-gallerie-5b7e884790b8a3.5710860815350190795928.jpg'},
{label:'tab 2', urlActive:'https://livelovely.com/static/images/full-listing/icon-modal-success%402x.png', urlInactive:'https://icon2.kisspng.com/20180823/ioc/kisspng-traffic-sign-image-traffic-code-no-symbol-inactive-symbol-www-pixshark-com-images-gallerie-5b7e884790b8a3.5710860815350190795928.jpg'},
{label:'tab 3', urlActive:'https://livelovely.com/static/images/full-listing/icon-modal-success%402x.png', urlInactive:'https://icon2.kisspng.com/20180823/ioc/kisspng-traffic-sign-image-traffic-code-no-symbol-inactive-symbol-www-pixshark-com-images-gallerie-5b7e884790b8a3.5710860815350190795928.jpg'},
]
}
}
render() {
console.disableYellowBox = true;
return (
<RN.View style={{flex:1}}>
//creating the tab height
<RN.View style={{flex:0.07, flexDirection:'row'}}>
{
//loop throught the state
this.state.tabList.map((item,index)=>{
return(
//the style just to make it beautiful and easy to debug
<RN.TouchableOpacity style={{flex:1, alignItems:'center', backgroundColor:index==0?'green':index==1?'blue':'yellow'}}
//this onpress to handle of active selected tab
onPress={()=>{this.setState({selectedIndex:index})}}
>
<RN.View>
<RN.Text>{item.label}</RN.Text>
<RN.Image
//here's the magic show off
source={{uri:this.state.selectedIndex==index?item.urlActive:item.urlInactive}}
style={{width:20, height:20, resizeMode:'contain'}}
/>
</RN.View>
</RN.TouchableOpacity>
)
})
}
</RN.View>
</RN.View>
);
}
}
结果是: