如何在 React Native 中通过 GET 请求获取图像？

Question

I am currently taking the image as a json file in loadImage() but I'm busting and would like to know which would be the right mode. Other thing to know is that I get the photo_reference parameter only after the first fetch . I'm using Google Maps Place Photo API. From the first fetch I get a JSON file.

My code so far:

const CardResturant = ({ resturant }) => {
  const [isLoading, setLoading] = useState(true);
  const [info, setInfo] = useState([]);

  const [imagePlace, setImage] = useState([]);
  const [isLoadImage, setLoadImage] = useState(true);

  useEffect(() => {
    setLoading(false);
    fetch(
      `https://maps.googleapis.com/maps/api/place/details/json?place_id=${resturant.id}&key=KEY`
    )
      .then((response) => response.json())
      .then((json) => {
        setInfo(json);
        loadImage(json?.result?.photos[0].photo_reference);
      })
      .catch((error) => console.error(error))
      .finally(() => setLoading(true));
  }, []);

  const loadImage = (photo_reference) => {
    setLoadImage(false);
    fetch(
      `https://maps.googleapis.com/maps/api/place/photo?maxwidth=100&photo_reference=${photo_reference}&key=KEY`
    )
      .then((response) => response.json())
      .then((photo) => setImage(photo))
      .catch((error) => console.error(error))
      .finally(() => setLoadImage(true));
  };

  return (
    <View>
      {!isLoading ? (
        <Text>LOADING</Text>
      ) : (
        <View>
          <View>
            <Image ??help?? />
          </View>
        </View>
      )}
    </View>
  );
};

Answer 1

You shouldn't be calling res.json() to parse an image. It should be res.blob() . That has been said, assuming you are trying to fetch one image, you could do it like so:

const [imagePlace, setImage] = useState(""); // initial it to an empty string

const loadImage = async (photo_reference) => {
  setLoadImage(false);
  try {
    const res = await fetch(
      `https://maps.googleapis.com/maps/api/place/photo?maxwidth=100&photo_reference=${photo_reference}&key=KEY`
    )
    const data = await res.blob();
    setImage(URL.createObjectURL(data));
  } catch (error) {
    console.error(error)
  }finally{
    setLoadImage(true)
  }
};

I'm using async/await just to have a better looking code. Your approach with then() would work as well. Finally change your JSX for rendering the image to:

{imagePlace ? (
  <Image source={{ uri: imagePlace }} style={{ width: 200, height: 200 }} />
) : (
  <></>
)}