SwiftUI picker not changing selection with an Enum - swiftui

Question

I'm trying to use an Enum with a SwiftUI picker, but can't get the picker to update the chosen value. Not quite sure what I'm doing wrong.
enum WindowLayout: String, Equatable, Codable, CaseIterable, Identifiable {
case oneByOne = "1 x 1"
case oneByTwo = "1 x 2"
case oneByThree = "1 x 3"
case twoByOne = "2 x 1"
case twoByTwo = "2 x 2"
case twoByThree = "2 x 3"
case threeByOne = "3 x 1"
case threeByTwo = "3 x 2"
var id: WindowLayout {
self
}
var rows: Int {
switch self {
case .oneByOne, .oneByTwo, .oneByThree:
return 1
case .twoByOne, .twoByTwo, .twoByThree:
return 2
case .threeByOne, .threeByTwo:
return 3
}
}
var columns: Int {
switch self {
case .oneByOne, .twoByOne, .threeByOne:
return 1
case .oneByTwo, .twoByTwo, .threeByTwo :
return 2
case .oneByThree, .twoByThree :
return 3
}
}
}
struct WindowCommands: Commands {
#ObservedObject var viewModel = GridConfigViewModel(windowLayout: WindowLayout.oneByOne)
var body: some Commands {
CommandMenu("Video") {
Picker(selection: $viewModel.windowLayout, label: Text("Window Configuration")) {
ForEach(WindowLayout.allCases, id: \.id) {
Text($0.rawValue).tag($0)
}
}
}
}
}
class GridConfigViewModel: ObservableObject {
#Published public var windowLayout: WindowLayout {
didSet {
print("set \(windowLayout.rawValue)")
}
}
init(windowLayout: WindowLayout) {
self.windowLayout = windowLayout
}
}

Answer 1

Create the viewModel wrapped in a #Publisher in the caller of WindowCommand instead of inside WindowCommand. That caller should be an ObservableObject.
The #ObservedObject is the correct wrapper for the property in WindowCommand, but they way it is above means it's instantiated each time WindowCommand is called.
#Published var gridViewModel = GridConfigViewModel(windowLayout: WindowLayout.oneByOne)
... then where WindowCommands is called ...
WindowCommand(viewModel: gridViewModel)