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Fun SwiftUI tip - conditionally applying background and foreground styles: .background(filled ? AnyShapeStyle(.thickMaterial) : AnyShapeStyle(.clear)) Utilize the AnyShapeStyle wrapper to conditionally apply your style.

Danny Behar

@dbehar.com

What's the problem and why does this work? You'll notice that some view modifiers in SwiftUI like .background or .foreground are expecting you to pass it a type that conforms to the protocol ShapeStyle. So you can't just toggle between Material and Color because while they are two different types

24/3/25, 3:31 pm0 reposts1 like

Danny Behar

@dbehar.com

24 Mar 2025

AnyShapeStyle provides us with a common concrete type that we can use when toggling between two different shape styles. Now everyone's happy! You, the compiler, and SwiftUI!

Axel Le Pennec

@alpennec.com

15 Apr 2025

Oh this is very useful! Doesn’t that have performance impact? Like AnyView which is not recommended to use.

Danny Behar

@dbehar.com

15 Apr 2025

Yea i think this is a trade off. If you are seeing hitches on a rapidly updating view that's using this AnyShapeStyle convenience then I think that would be a great place to optimize. But, otherwise I think it's ok to sprinkle in where necessary. Like most things: IT DEPENDS 😅