Created
August 17, 2025 00:39
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| import SwiftUI | |
| @Observable | |
| final class Controller { | |
| init() {} | |
| let cooldown0 = 0.2 | |
| let cooldown1 = 0.2 | |
| var showsAlert: Bool = false | |
| var count: Int = 0 | |
| func start() { | |
| Task { | |
| count += 1 | |
| showsAlert = true | |
| try await Task.sleep(for: .seconds(cooldown0)) | |
| showsAlert = false | |
| try await Task.sleep(for: .seconds(cooldown1)) | |
| count += 1 | |
| showsAlert = true | |
| } | |
| } | |
| } | |
| struct ContentView: View { | |
| @State var controller: Controller = .init() | |
| var body: some View { | |
| VStack { | |
| Button("tap me") { | |
| controller.start() | |
| } | |
| } | |
| .padding() | |
| .alert( | |
| "alert \(controller.count)", | |
| isPresented: $controller.showsAlert, | |
| actions: { } | |
| ) | |
| } | |
| } | |
| #Preview { | |
| ContentView() | |
| } |
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現状、update()を呼ぶ経路が2つあるので、stepは即座に更新しないと色々おかしくなりますね。