Image downloaded cannot be loaded from storage on next boot on IOS

[joshua-augustinus]

I'm downloading an image then saving the filepath to storage. then on next bootup check the filepath; if it exists then use that as the source for the image. Example:

export const preloadImage = (images: ImageInfo, callback?) => {
    const shouldCache = true;
    //Init
    return RNFetchBlob
        .config({
            // add this option that makes response data to be stored as a file,
            // this is much more performant.
            fileCache: shouldCache,
            // by adding this option, the temp files will have a file extension
            appendExt: 'jpg'
        })
        .fetch('GET', images.url, {
            //some headers ..
        })
        .then((res) => {
            let source;
            if (Platform.OS === 'android') {
                source = { uri: 'file://' + res.path() }

            } else {
                source = { uri: '' + res.path() }

            }
            const key = images.id.toString();
            localImages[key] = source;

            if (callback) {
                callback(source);
            }

            saveImageKeysToStorage();
        })
}

On Android it works fine. But on ios it doesn't work.

I have a sample repo here: https://github.com/joshua-augustinus/training-storage

[albmin]

are you storing it somewhere persistent? or in a temporary storage location that's prone to purging?

[joshua-augustinus]

I didn't set the filepath so am using whatever the default is.

I tried again using DocumentDir

    const shouldCache = true;
    const dirs = RNFetchBlob.fs.dirs

    //Init
    return RNFetchBlob
        .config({
            // add this option that makes response data to be stored as a file,
            // this is much more performant.
            fileCache: shouldCache,
            // by adding this option, the temp files will have a file extension
            path: dirs.DocumentDir + '/path-to-file.jpg'
        })

And it worked on a real device but not on simulator.

After further testing it seems the issue is just the simulator. It works with unspecified filepath on real device but not simulator.

[joshua-augustinus]

For anyone who has the same issue also note that the DocumentDir on IOS is dynamic on building and installing the app a second time. So you have to store the filename and add that to the document dir rather than saving the whole path.