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iosswiftperformanceswiftui

Does SwiftUI perform any additional computation if .shadow radius is set to 0?

I'm working on optimizing few components and am introduction an optional shadow option i.e.

VStack {
 ...
}
.shadow(radius: isShadow ? 0 : 10)

The idea here is to not render shadows where they are not needed and save a bit of compute time, but I'm not sure if this use case actually achieves it.

Would appreciate a detailed explanation, maybe with references on whether performance would be a bit better with shadow of radius 0 or not. And why.

Solution

  • Please check this out:

    https://stackoverflow.com/a/74659992/22907942

    It states that you should be able to optimise your shadow drawing performance by using Shape().shadow(...) in the background layer.