@main
struct OscillatingEmbersApp: App {
var model: AppModel = AppModel.restoreFromUserDefaults()
var body: some Scene {
WindowGroup {
computedView()
}
}
func computedView() -> some View {
model.increment()
model.saveToUserDefaults()
if model.isEven() {
return AnyView(EvenView())
} else {
return AnyView(OddView())
}
}
}
class AppModel: Codable {
static let StorageKey = "AppModel.StorageKey"
var count: Int = 0
init(count: Int) {
self.count = count
}
func increment() {
count += 1
}
func isEven() -> Bool {
count % 2 == 0
}
static func restoreFromUserDefaults() -> AppModel {
let defaults = UserDefaults.standard
let count = defaults.integer(forKey: AppModel.StorageKey)
return AppModel(count: count)
}
func saveToUserDefaults() {
let defaults = UserDefaults.standard
defaults.set(self.count, forKey: AppModel.StorageKey)
}
}
So I tried this in Xcode 12 on an emulator iPhone 12 Pro Max running 14.0. Each time I launch the app, I get an odd then even screen on successive launches.
So I would add something that saves if the user has done onboarding then return the correct view?
EvilTofu
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This only works if I create my own window. I am relying on the SwiftUI app's default create window function. There is another suggestion in the link where NSApplication.shared.keyWindow?.close()
is suggested. This works.