如何让平面列表只渲染一次？

Question

I am trying to print the ComponentTwo Flatlist only once but instead, I am getting the result image1 but instead, I need it to appear like this image 2 . I have attached a snack link with the code in it.

Code That will produce the same results as in the images Expo Snack Link

Answer 1

Working Example: Expo Snack

Here is how you can fix this, first pass the index value to ComponentOne from App.js

const App = () => {
 return (
      <SafeAreaView style={styles.container}>
        <FlatList
            data={DATA}
            renderItem={({item, index}) => <ComponentOne name={item.title} index={index}/>}
            keyExtractor={(item) => item.id}
        />
      </SafeAreaView>
  );
};

Now use that prop value to render ComponentTwo conditionally in ComponentOne like shown below:

//...const 

ComponentOne = (props: ComponentOneProps) => {
  return (
    <View style={{ margin: 15, backgroundColor: 'yellow' }}>
      <FlatList
        data={recent}
        renderItem={({ item }) => {
          console.log("hello")
          // @ts-ignore
          return props.index == 0?<ComponentTwo name={item.name} />:null;
        }}
        keyExtractor={(item) => item.idd}
      />
//...