Trying to implement a `UITableViewDataSource` Protocol in pu kotlinlang #ios

Protocol in pure Kotlin... The bridging seems to think I'm overriding a totally different method signature in the protocol, and so is throwing a compile error (on the return type). Is this expected? A bug? Workarounds exist with annotations?

svyatoslav.scherbina

12/18/2018, 10:46 AM

The bridging seems to think I’m overriding a totally different method signature in the protocol, and so is throwing a compile error (on the return type)

Could you clarify? Btw, to override Objective-C method, you have to use the same parameter names.

darkmoon_uk

12/18/2018, 10:48 AM

I used IntelliJ's own code generation to override. I'll provide exact failing code:

class Source : NSObject(), UITableViewDataSourceProtocol {

    override fun tableView(tableView: UITableView, cellForRowAtIndexPath: NSIndexPath): UITableViewCell {...}

    override fun tableView(tableView: UITableView, numberOfRowsInSection: NSInteger): NSInteger {...}
}

I tried applying explicit

@ObjCMethod

to reaffirm ObjC signature, but no change.

svyatoslav.scherbina

12/18/2018, 11:00 AM

This issue is likely to be related to Kotlin/Native support in IntelliJ IDEA. The compiler should handle this code properly. Could you check this?

darkmoon_uk

12/18/2018, 11:10 AM

Yes, it does compile correctly despite the IDE errors - apologies for not checking that earlier.

svyatoslav.scherbina

12/18/2018, 11:12 AM

It’s ok 🙂 Could you please report the IDE issue to https://github.com/JetBrains/kotlin-native/issues ?

darkmoon_uk

12/18/2018, 11:27 AM

Filed: https://github.com/JetBrains/kotlin-native/issues/2476

:tnx: 1

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