alertitem_example_2.swift

struct ContentView: View {
    
    @State var alertItem : AlertItem?
    
    var body: some View {
            
        /// button
        Button(action: {
            
            self.alertItem = AlertItem(title: Text("I'm an alert"), message: Text("Are you sure about this?"), primaryButton: .default(Text("Yes"), action: {
                
                /// trigger second alert
                DispatchQueue.main.async {
                    self.alertItem = AlertItem(title: Text("Error"), message: Text("An unexpected error occurred"), dismissButton: .default(Text("OK")))
                }
                
            }), secondaryButton: .cancel())
        }, label: {
            Text("SHOW ALERT")
        }).alert(item: $alertItem) { alertItem in
            
            guard let primaryButton = alertItem.primaryButton, let secondaryButton = alertItem.secondaryButton else{
                return Alert(title: alertItem.title, message: alertItem.message, dismissButton: alertItem.dismissButton)
            }
            return Alert(title: alertItem.title, message: alertItem.message, primaryButton: primaryButton, secondaryButton: secondaryButton)
        }
        
    }
}