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by jumhyn 2096 days ago
That problem could have been resolved via type erasure (either via `AnyView`, or, if SwiftUI had been designed differently, by having the `body` property be of type `View` rather than `some View`). In fact, opaque types (a la `some View`) were motivated by SwiftUI so that the type information could be preserved to enable the necessary optimizations/animations, without requiring users/library authors to write out/expose the complex type signatures that can arise from even simple view hierarchies.

Incidentally, if you use `AnyView` liberally you’ll likely see worse automatic animations and degraded performance [ETA: the “degraded performance” claim here appears to have been debunked—see the link below for more info!].
1 comments
LeoNatan25 2096 days ago
Despite what is claimed about AnyView, this has for the most part been proven wrong. AnyView is just as fast, if not faster.

https://nalexn.github.io/anyview-vs-group/

In fact, Apple themselves use AnyView internally for many of their controller presentations (such as sheets and pushed controllers).

link
jumhyn 2096 days ago
Great article! Glad to have that misconception cleared up.
link