Question

我有一个呈现为视图的数据，并且遇到了有关如何删除已刷过的特定索引的问题

我使用FlatList的方式如下

render() {
this.leftOpenValue =  Dimensions.get('window').width;
this.rightOpenValue = -Dimensions.get('window').width;

return (   

     <FlatList 
            data = {data}  
            keyExtractor = {data => data.id}                
            renderItem={ ({item}) => (

                <View style={styles.container}>
                    <SwipeView            
                        disableSwipeToRight = {false}
                        renderVisibleContent={() => 
                            <View>
                                <Text style={styles.text}> {item.title} </Text>     // This repeats 9 times (9 Index)              
                            </View>          
                        }
                        renderRightView={() => (
                            <View style={{flex:1, justifyContent: 'flex-end', alignItems: 'center', backgroundColor: 'red'}}>

                            </View>
                        )}

                        leftOpenValue = {this.leftOpenValue}
                        rightOpenValue = {this.rightOpenValue}
                        onSwipedLeft={() => alert("deleted")}
                        swipeDuration = {300}
                        swipeToOpenPercent = {40}
                        disableSwipeToRight = {true}
                    />
                </View>  

            )}
    />
);

我已经使用Swipeview进行滑动（react-native-swipeview）并删除了平面列表中的索引

我对如何从flatList中删除项目有疑问

Answer 1

deleteItemById = id => {
  const filteredData = this.state.data.filter(item => item.id !== id);
  this.setState({ data: filteredData });
}

render() {
  ...

  return (   
    <FlatList 
      data = {data} // Assuming this is `this.state.data`
      keyExtractor = {({item}) => item.id}                
      renderItem={({item}) => (
        <View style={styles.container}>
          <SwipeView
            ...
            onSwipedLeft={() => this.deleteItemById(item.id)}
            ...
          />
        </View>  
      )}
    />
  );
}

Answer 2

将该项的ID传递到onSwipeLeft={this.deleteItem(item.id)}并使用setState更新数据。

state = {
    data: [{
      title: 'Hello world',
      id: 'hello'
    },{
      title: 'World says hello',
      id: 'say'
    }]
}

deleteItem = (id) => {

   this.setState({
    data: this.state.data.filter(item => item.id !== id)
   })

}

Answer 3

做一个普通的对象删除然后过滤你的状态来清理它

 let _rem = this.state.data;
 delete  _rem[index_no];
 this.setState({data: this.state.data.filter(args=>args!==index_no)});

如何在React Native中从FlatList中删除项目/索引？

3 个答案: