ScrolltoIndex 在平面列表上不起作用反应原生 [英] ScrolltoIndex not working react-native on a flatlist

问题描述

我正在使用 flatList 来渲染 json 文件中的项目，我想在按下按钮时滚动到特定索引，我声明了按下按钮的功能，如下所示

I'm using a flatList to render items from a json file, I want to scroll to a specific index when a button is pressed, I declared the function for button press as below

goIndex = () => {
    this.flatListRef.scrollToIndex({animated: true,index:5});
};

虽然它没有显示任何错误，但列表没有移动到指定的索引.

although it doesn't show any errors, the list is not moving to specified index.

反应原生:0.55.4

react-native: 0.55.4

附上FlatList的代码.

Attaching code of FlatList.

<View>
    <FlatList   
        getItemLayout={(data, index) => { return {length: 33, index, offset: 33 * index} }}
        ItemSeparatorComponent={ () => <View style={ { width:"100%", height: .7, backgroundColor: 'rgba( 52,52,52,1)' } } /> }
        data={this.state.outverse}
        renderItem={({item,index}) =>
            <View style={styles2.flatview}>
                <Text style={styles2.name}>{++index}  {item} </Text>
            </View>
        }
    />
</View>

推荐答案

尝试添加对 FlatList 组件的引用，如下所示:

Try adding reference to your FlatList component like below :

<View>
    <FlatList   
        getItemLayout={(data, index) => { return {length: 33, index, offset: 33 * index} }}
        ItemSeparatorComponent={ () => <View style={ { width:"100%", height: .7, backgroundColor: 'rgba( 52,52,52,1)' } } /> }
        data={this.state.outverse}
        ref={(ref) => { this.flatListRef = ref; }}
        renderItem={({item,index}) =>
            <View style={styles2.flatview}>
                <Text style={styles2.name}>{++index}  {item} </Text>
            </View>
        }
    />
</View>

在 goIndex 函数中:

goIndex = () => {
    this.refs.flatListRef.scrollToIndex({animated: true,index:5});
};

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