Hide download button in FlatList if file exists in Expo FileSystem

Expo SDK
1

I’m fairly new to React Native/Expo but have been getting on ok. This has stumped me though!

I have a flatList which is looping round PDF documents from an API. The user can download documents to the Expo FileSystem. Any ideas on how can i hide the download button if the file exists in the Expo fileSystem?

Code i have so far below (checkFileExists is in a componentDidMount):

async checkFileExists(doc) { 
try{
  let result = await FileSystem.getInfoAsync(FileSystem.documentDirectory+'app_docs/'+doc);
  console.log(result)

  if(result.exists){
    return true;
  } else {
    return false;
  }
} catch(err){
  console.log(err)
}
}

      <FlatList 
        contentContainerStyle={styles.gridContainer}
        keyExtractor={(item) => item.doc_id}
        data={this.state.docs}
        renderItem={({ item }) => {
          if(this.state.rows > 0){ 
          return(
          <View style={styles.itemBox}>
            <View style={styles.innerBox}>
              <Text style={styles.itemTitle}>{item.doc_title}</Text>
              <Text style={styles.itemDesc}>{item.doc_desc}</Text>
              {item.dl_permitted !=0 &&
                <TouchableOpacity title={item.doc_title} onPress={() => this.props.navigation.navigate('DocPdf', {PdfFile: 'https://example.com/library/documents/'+item.doc_file, headTitle: item.doc_title})}><Text style={styles.outlineBtnBox}>View</Text></TouchableOpacity>
              }

              {this.checkFileExists(item.doc_file) &&
              <TouchableOpacity onPress={() => this.DownloadDocument(item.doc_file)}>
                <Text style={styles.orangeBtn}>Download</Text>
              </TouchableOpacity>
              }

              {item.dl_permitted===0 &&
                <Text style={{marginTop:10,color:'#f36a48', fontWeight:'bold'}}>This document is available for purchase from the website.</Text>
              }
            </View>
          </View>
          )
          } 
        }}             
        initialNumToRender={15}
        maxToRenderPerBatch={15}
        windowSize={15}
        ListHeaderComponent={this.renderHeader()}
        onEndReached={() =>this.LoadedDocs()}
        onEndReachedThreshold={0.8}
        ListFooterComponent={this.LoadingDocs()}
        bounces={false}
    />
2

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