Issue with rendering Base64 image array strings in FlatList component in React Native

In my RN App, I am trying to display a FlatList with Image Items but it seems like I have missed something. I am retrieving blob data from my API, converting it to a String using Buffer, and then adding it to an Array. This Array is used to populate the FlatList.

export function HomeScreen() {
  const imagesList: any = [];

  useEffect(() => {
    loadData();
  }, []);

  const loadData = async () =>{
    await callAPI().then(res => {
      //blob base64 is from type jpeg
      imagesList.push({imageURI: "data:image/jpeg;base64,"+Buffer.from(res.image1).toString('ascii')})
    })
  }

  return (
    <View style={[styles.imageSlider, {width, height}]}>
      <FlatList
        data={imagesList}
        renderItem={({item, index}) => (
          <>
            {console.log('item: ', item)}
            <Image
              key={index}
              source={{uri: item.imageURI}}
              style={{
                height,
                width,
                resizeMode: 'cover',
                maxHeight: 500,
                maxWidth: 500,
              }}
            />
          </>
        )}
      />
    </View>
  )
}

I have validated the data received from the api and everything appears to be correct, however, the images are not rendering. Could someone identify what might be causing this issue? I do not possess advanced knowledge in RN. Thank you!

Answer №1

There are a couple of issues that need attention...

  1. It appears that you are not utilizing any state in your code
  2. You seem to be encoding the buffer as ASCII instead of Base64
// Implementing state using the useState hook
const [ imagesList, setImagesList ] = useState<Array<{ imageURI: string }> >([]);

const loadData = async () => {
  const { image1 } = await callAPI()
  // You're expecting an array for some reason ¯\_(ツ)_/¯
  return [{
    imageURI: `data:image/jpeg;base64,${Buffer.from(image1).toString("base64")}`
  }]
}

useEffect(() => {
  loadData.then(setImagesList)
}, [])

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