在React-Native中有2列的FlatList上防止单独项变为100%宽度

<FlatList
  data={data}
  renderItem={renderItem}
  keyExtractor={keyExtractor}
  numColumns={2}
/>

const renderItem = ({ item }) => (
  <View style={styles.itemContainer}>
    <Text>{item.title}</Text>
  </View>
);

const styles = StyleSheet.create({
  itemContainer: {
    flex: 1,
    width: '50%',
    padding: 10,
  },
});

const data = [
  { id: '1', title: 'Item 1' },
  { id: '2', title: 'Item 2' },
  { id: '3', title: 'Item 3' },
  // 添加一个占位项
  { id: 'placeholder', title: '' },
];