Question about sources of WithPerceptionTracking

[Nikolaiko]

Hi, it's my first post here I don't know is it okay to ask about sources and under tht hood mechanics. Sorry if I doing something wrong.

I just trying to understand how things work and looked into WithPerceptionTracking. And found a body property defined like this:

I think I understand 'else' part. If not iOS 17 we use withPerceptionTracking and inside depending on iOS version using withObservationTracking or Perception backport.

But why if iOS 17 we just return instrumentalBody? Because we assume that in that case macros @ObservableState was used on state and it will be work well togther, we don't need to add anyting here?

[mbrandonw]

Hi @Nikolaiko, in the if branch we see that the user is running iOS 17+, and so SwiftUI does all the heavy lifting for observation. We don't have to do any additional work. Does that help?

[Nikolaiko]

@mbrandonw thank you for response!
Yes, that helps.