Have a problem with navigation in IOS App

[Gra-Dus]

Hello. I develop kmm module. Android App works good with navigation. But in IOS App navigation sending warning "A navigationDestination for “UIOSChild” was declared earlier on the stack. Only the destination declared closest to the root view of the stack will be used." I dont undestand how to solve that.

[arkivanov]

It's hard to say without a reproducer. But it sounds like you have duplicated distinctions in your stack, or something like that.

[Gra-Dus]

Based on the search in the framework code, I can say that this is a Child.

For navigation we use StackView from sample. I think somewhere in NavigationStack happens comparsion.

[arkivanov]

Ok, it seems corresponds to Child sealed class from Decompose. With the reproducer code it's hard to say what's the cause. But I think it's related to nested navigation (navigationDestination(for: Child<AnyObject, T>.self) being repeated). Would it be possible for you to create a runnable reproducer?

[Gra-Dus]

https://github.com/Gra-Dus/UIOSChildSampleError

[arkivanov]

Thanks for the reproducer! I don't have those warnings, but the issue is still reproducible. When I click on "goToReg", the new screen is pushed and then immediately popped back. Is this the issue you are experiencing?

If so, for now I don't have any solution, this looks like a bug in NavigationStack when it's nested. One thing that I noticed is that StackInteropView works fine. So maybe as a workaround use only that one.

[arkivanov]

In https://forums.developer.apple.com/forums/thread/665369?answerId=719452022#719452022 the following is mentioned:

Definitely broken in iOS16. It appears (from my reading) that this is the way things work. Any change to an ObservedObject outside of a NavigationStack or sheet will cause the parent view to be rebuilt, which in turn wipes the stack or sheet.

This sounds like exactly what you are experiencing.

[arkivanov]

Also, this post says:

The intended way to use it is to have one top-level NavigationStack

Which is sad if it's true.

[Gra-Dus]

Thank you for help.

[arkivanov]

You can try this variant of StackView by @AJIEKCX: https://gist.github.com/AJIEKCX/e1c50fb3b1c0496138bcdbb2779e3898

[FelixFalkovsky]

No solution to the problem ?

[arkivanov]

There were a few options discussed above. Worth trying some of them

[FelixFalkovsky]

Спасибо последнее решение помогло !