React-Native re-render Flatlist - react-native

Question

I'm having trouble keeping the data in my Flatlist after coming back from another page. My scenario is as follows:
User goes to homepage and scrolls through 20 items
User clicks their profile tab changing page using react-native-router-flux
User clicks the home tab taking them back to the list however the list re-renders and starts from the top.
How can I stop this re-rendering and fetching the same data again?
componentDidMount() {
this.makeRemoteRequest();
}
makeRemoteReuest gets my data from firebase in batches of 5 and sets data: []
data: [...this.state.data, ...results]
I've tried using the below but not sure if this is correct, when i navigate away and back the data re-renders. I want to keep the data so the page will be exactly the same as when it was left.
shouldComponentUpdate(nextProps, nextState) {
if (JSON.stringify(this.state.data) !== JSON.stringify(nextState.data)) {
return true;
}
return false;
}
My flatlist:
<View>
<FlatList
scrollsToTop={false}
ref={(ref) => { this.flatListRef = ref; }}
showsHorizontalScrollIndicator={false}
onScroll={this.handleScroll}
data={this.state.data}
keyExtractor={item => item.key}
ListFooterComponent={this.renderFooter()}
onRefresh={this.handleRefresh}
refreshing={this.state.newRefresh}
onEndReached={this.handleEndRefresh}
onEndReachedThreshold={0.05}
getItemLayout={this.getItemLayout}
renderItem={this.renderItem}
/>
{this.state.refreshAvailable ? this.renderRefreshButton() : null}
</View>
Thanks for any help!

Answer 1

Coded long back for the dumb project, maybe this can help you
The View: used onLayout Prop for getting the y-axis
<ScrollView
ref={(ref) => this.scrollTo = ref}
contentContainerStyle={{margin:5,}}
>
<Card onLayout={(event) => this._findHeight(event.nativeEvent.layout, 'personal')}>
<Personal review={true}/>
</Card>
</ScrollView>
The Function: stored the y-axis; here i have used realm db
_findHeight = (e, name) => {
const {x, y, width, height} = e;
this.realm.write(() => {
this.realm.create('yLocation',{names:name,yaxis:y}) :
});
}
The AutoScroll Method: here i have used scrollTo method from ScrollView you can use any method using their ref
_scrollTo = (y) => {
this.scrollTo.scrollTo({x:0,y:y,animated:true});
}
Note : Call _scrollTo method in componentDidMount