Implement :data:db for iOS instead of :data:db-room

[kikuchy]

Overview (Required)

• In order to achieve Kotlin Multiplatform API implementation #136, we should make iOS implementation (as Kotlin/Native module) of :data:db instead of :data:db-room .
• Or make :data:db-room Kotlin Multiplatform module.
• The role of :data:db-room is caching of Sessions, Speakers and Sponsers (maybe). iOS implementatuon can use NSUserDefaults to save data.

Links

• https://developer.apple.com/documentation/foundation/nsuserdefaults

[takahirom]

Sorry, I think :data:db is now interface module. Is that :data:db-impl ?

[kikuchy]

Sorry for my misleading.

Currently :data:db-room is Android implementation module of :data:db.
We need iOS implementation module of :data:db.

Of cource, renaming :data:db-room to :data:db-impl and including both Android/iOS implementation in :data:db-impl is good way.
(But I think it’s little hard. I tried to make :data:db-room Kotlin Multiplatform module, and it broke building :frontend. I can’t investigate why it cause yet. 😢 So I think making each implementation modules individually is good.)

[takahirom]

I have a question 🙋‍♂️
How we debug iOS implementation for development?

[kikuchy]

Debugging means testing?
I never tried testing iOS library written in Kotlin, but maybe this ( Kotlin/kmp-basic-sample#1 ) will help us.

If you mean "running app in DEBUG mode and stopping at breakpoint", we should make Xcode project of app ( maybe on frontend/ios ?) first.

[takahirom]

I think that it will be easier to contribute if we can create an empty frontend / ios project. What do you think?

[kikuchy]

Good idea!
And making the direction of implementation of iOS app is more better.
What do you think about below?

• Where should we place ViewControllers?
  • All VC is in frontend/ios
  • Each iOS Framework projects in feature/*
• Where is the threshold of language?
  • Only Data modules -> Kotlin, Feature and Root modules -> Swift
  • Data and Feature modules -> Kotlin, Only Root module -> Swift

[takahirom]

Sorry, I don't have an idea. But I think we can implement All VC is in frontend/ios.
Because that is Swift source code.
I think Only Data modules are written in Kotlin for iOS.
What do you think? 👀

[nukka123]

Perhaps, it might be useful?
https://github.com/square/sqldelight

[takahirom]

If we migrate that, Yes.
It becomes 1.0. We can consider that 👍

[kikuchy]

I think Only Data modules are written in Kotlin for iOS.

Ok. I think it’s simple and understandable.
We need the template of Xcode project on this direction, and the issue to make that Xcode project... 🙄
I’ll open issue this weekend if I can...

[kikuchy]

Opened #389 🎉