DotLottieFile init with Data

[kirti-swiggy]

For my use case, I need to download a dotLottie file from the remote and store it in a persistent cache so that I can load the lottie from the cache for the next launch(es). I am able to download the data (Foundation.Data) from the URL response and save it to the cache. But I couldn't find a way to create DotLottieFile instance using the data. There is an init of DotLottieFile that takes Data as a parameter but unfortunately, that's an internal function.

Please suggest if there's another way to do this. Thanks in advance!

[calda]

If you're interested in this functionality you could submit a pull request adding a helper for this to DotLottieFileHelpers.swift. It seems reasonable to have a helper for creating a DotLottieFile from a Foundation.Data, considering we also have a Data helper for LottieAnimation itself here.

[kirti-swiggy]

Thanks much @calda for the quick reply! I'll raise the PR.

[nsarno-lucid]

I have a similar use-case where we want to init a DotLottieFile with Data, except it needs to be done synchronously.

This is possible using LottieAnimation...

case .json(let dict):
     if let animation = try? LottieAnimation(dictionary: dict) {
          LottieView(animation: animation)
     }

But the only init for DotLottieFile seems to be asynchronous...

case .data(data: let data):
     LottieView({
          try await .dotLottieFile(.loadedFrom(data: data, filename: "abc"))
     })

Is it possible to add a synchronous initializer for DotLottieFile? Something like this would be ideal...

case .data(data: let data):
     if let dotLottie = try? DotLottieFile(data: data) {
          LottieView(dotLottie: dotLottie)
     }

Please let me know if there's already a way to do this! Thanks.

[calda]

All DotLottie initializers are asynchronous because it involves interacting with the file system. A DotLottie files is really a zip archive, which has to be extracted to disk before we can load the individual files. There's a DotLottieFile.SynchronouslyBlockingCurrentThread namespace that loads a DotLottie file synchronously by blocking the thread while waiting for the file operations. You could use that instead if it suits your needs.

[nsarno-lucid]

Thanks for the quick response @calda! I will try to make this work.