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;


并在componentwillMount

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>
  }
/>

最佳答案

您可以在此处阅读答案[How do I make a list (FlatList) automatically scroll through the elements using Animated?]

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)
 }


实际上,您应该增加索引,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

关于javascript - 想在React Native中自动滚动平面列表,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/54569618/

10-10 23:29