constructor(props) {
    super(props);
    this.state = {
        listData: testData,
        onRefresh: false,
        swiperShow:false,
    };
}

componentDidMount(){
    setTimeout(()=>{
        this
 
.setState({swiperShow:true});
    },0)
}

renderSwiper=()=>{
    if(this.state.swiperShow){
        return (
            <Swiper height={150} autoplay={true} activeDotColor="#fff">
                {BANNER_LIST.map((item, i) => {
                    return <Image source={require('../../../img/banner.jpeg'
 
)} key={i} style={styles.banner}/>;
                })}
            </Swiper>
        );
    }else {
        return <View style={{height:150}}></View>;
    }
}