Hey morning, Does someone have a good recommendati...

# multiplatform

[mboudraa]

Hey morning, Does someone have a good recommendation for a video or a blog post that does a deep dive on how to add an objective C dependency into a multi module app without using cocoapods or carthage?
I’d like to be able to reuse a multiplatform module across 2 apps without having to copy the iOS implementation into the 2 apps.

[François]

What kind of objc do you want to import? A framework? The sources?

[mboudraa]

It could be either I guess?
The same kind of dependency we’d use with cocoapods or carthage but we don’t want to use any of those package managers

[François]

So try spmforkmp

[mboudraa]

how does it work? I mean beyond just the documentation.

[François]

Just like cocoapods but using the embedded swift package manager of swift/xcode.
Also, you have a bridge where you can put the code you want.

[mboudraa]

The bridge is the swift source set?
i guess there are no autocompletion or compilation check, is there?

[François]

I’m trying to make bridge more developer friendly. You can use vscode for writing inside your bridge or create a local spm package that you add later to the plugin

[François]

The compilation check is done during the build of your project, it’s not a big issue

[mboudraa]

That bridge is onlyif we want to use a swift package that we want to expose through kmp by creating on objc bridge, right?

[François]

Yes, for example if you need to use the nfc api that can’t be done in kotlin, you can do it inside the bridge

[François]

Or use iOS dependency written in swift

[François]

The wrapper part is mandatory until swift import exist

[mboudraa]

So the only thing I need to wrap is the part I want to expose to KMP, right?

[François]

Yes, that’s it

[mboudraa]

But for regular objc frameworks, there’s no bridges required we can just add the dependency and it just works?

[François]

Yes, I think so,
if you do that and it’s not working, create an issue and I will happy to help you.

[François]

Using firebase or sentry are both working great with the plugin

[mboudraa]

Thank you. Will look at that.

[mboudraa]

Out of curiosity how did you learn about how to configure cinterop properly so you could make that plugin?
Is there any material you’d recommand?

[François]

Reading the documentation, experiment and a solid background in iOS development :D

[mboudraa]

Ahh. that helps a lot indeed

[Sargun Vohra]

If you'd like an example usage, maplibre-compose uses spmforkmp (without a bridge, because MapLibre is ObjC)

[mboudraa]

What happens when different modules depend on the same library and are all embedded in an umbrella framework and we use copyDependenciesToApp = true
Is the dependency duplicated?

[François]

copyDependenciesToApp only copy the resources needed by the application, that’s all.
It doesn’t care about the duplication. be sure to use the same version of the dependency eveywhere

[François]

juste like moko or compose resources

[mboudraa]

👍