swiftswiftui

How to trigger an Alert in View in Swift UI using a state from an enum in a singleton class

Assume a singleton class that has an enum about a login state as follows:

@Published var loginState: LoginState = .unknown

The singleton class instance is assigned as an @ObservedObject in the View to get changes from other @Published variables as follows:

struct LoginView: View {
    @ObservedObject var loginDelegate = Singleton.shared

How do I trigger an Alert in a View using something like the following, when the singleton loginState is set to a certain enum case (for example .error)?

}.alert(isPresented: <something> ) { ... }
Solution

  • Try the following

    }.alert(isPresented: .constant(loginDelegate.loginState == .error)) { ... }

    but you will need to reset loginDelegate.loginState back to, say, .unknown in alert close button action, otherwise alert might re-appear immediately.