Handle animations in SwiftUI with @Default

[Vincz]

Hi! First of all, I'm sorry if it's a stupid question or if it has nothing to do with these package.

I'm trying to animate a List where the order of elements depends on a variable in Defaults.
If I'm using a @State, it's working as expected.
If I'm using a @Default, animation doesn't work.

These works:

enum OrderBy: String, Codable, Defaults.Serializable {
    case index, name
}

struct Element: Identifiable {
    let id: String
    let index: Int
    let name: String
}

let allElements: [Element] = [
    .init(id: "1", index: 5, name: "Element 1"),
    .init(id: "2", index: 4, name: "Element 2"),
    .init(id: "3", index: 1, name: "Element 3"),
    .init(id: "4", index: 3, name: "Element 4"),
    .init(id: "5", index: 2, name: "Element 5"),
]

struct MyView: View {
        @State var order: OrderBy = .index
        func toggleOrder() {
            withAnimation {
                order = order == .index ? .name : .index
            }
        }
        
        var elements: [Element] {
            allElements.sorted(by: { order == .index ? $0.index < $1.index : $0.name < $1.name })
        }

        var body: some View {
            Picker("Order by", selection: $order) {
                Text("index").tag(OrderBy.index)
                Text("name").tag(OrderBy.name)
            }
        
            List {
                ForEach(elements, id: \.id) { element in 
                    Text("Element \(element.name)")
                }
         }
     }
}

These doesn't work:

extension Defaults.Keys {
    static let order = Key<OrderBy>("orderBy", default: OrderBy.index)
}

struct MyView: View {
        @Default(.order) var order
        func toggleOrder() {
            withAnimation {
                listSortOption = listSortOption == .index ? .name : .index
            }
        }
        ...
}

Is these a limitation of the package or is it completely something else?
Thanks

[sindresorhus]

Most likely a SwiftUI bug. The issue was introduced by 2dad0e4, but that was done to work around another SwiftUI bug, so we cannot just revert that.

[Vincz]

Is there any way we can bypass the issue without an intermediate variables somewhere?
Will it be fixed in the package or when the SwiftUI bug will be fixed?
Thanks!

[richardkunkli]

Hi! Any update on this specific issue? Faced the same with version 9.0.1.