我正在尝试自动滚动我的平面列表,但是当我运行代码时,我无法自动滚动,如果我想手动滚动,则每5秒就会出现索引0。 这是我的所有平面列表代码及其refs函数
在构造函数中
this.flatList1=null;
在componentwillMount
中componentWillMount(){
setInterval(()=>{
if(this.flatList1!==null){
this.flatList1.scrollToOffset({ offset: 1 })
}
}, 5000);
}
<FlatList horizontal
data={this.state.getallvideos}
ref={flatList1 => { this.flatList1 = flatList1 }}
renderItem={({item}) =>
<TouchableOpacity onPress={this.playvideoinnetpage.bind(this,item.vd_link,item.vd_thumbnail,item.vd_id,item.vd_title)}>
<Card
containerStyle={{
padding:0,
width:180,
height:112,
backgroundColor:'#000',
borderColor:'#000',
marginTop:10,
marginLeft: 5,
marginRight:5,
marginBottom:5
}}
image={{uri:item.vd_thumbnail}}
imageStyle={'stretch'}
>
<View style={{position:'relative',bottom:75,}}>
<Text numberOfLines={1} style={{color:'#fff',fontWeight:'bold',fontSize:14}}> {item.vd_title}</Text>
</View>
</Card>
</TouchableOpacity>
}
/>
答案 0 :(得分:0)
您可以在此处阅读答案[docs]
scrollToIndex = (index, animated) => {
this.listRef && this.listRef.scrollToIndex({ index, animated })
}
componentDidMount() { // use componentDidMount instead since the WillMount is getting deprecated soon
setInterval(function() {
const { sliderIndex, maxSlider } = this.state
let nextIndex = 0
if (sliderIndex < maxSlider) {
nextIndex = sliderIndex + 1
}
this.scrollToIndex(nextIndex, true)
this.setState({sliderIndex: nextIndex})
}.bind(this), 3000)
}
基本上应该增加索引,而不是像上面的代码那样每5000ms将其设置为1。保持currentIndex,maxIndex并在如上所述增加currentIndex之后使用scrollToIndex函数。确保使用setInterval更新currentIndex之后正在修改状态