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Alerts not working together

Forums > 100 Days of SwiftUI

Hi, the second alert works if the first is commented out but I cannot get them to work together. When showingScore is true and playAgain is true I expected the alerts to run one after the other but that is not the case.

I've added some extra Text fields to my view so I can watch the two variables and they are changing from false to true as I would expect. showingScore is reset to false by the alert and even though playAgain is true the alert does not appear.

    .alert(scoreTitle, isPresented: $showingScore) {
        Button("Continue", action: askQuestion)
    } message: {
        Text("Your score is \(usersScore) From \(guessesCounter) \(guessOrGuesses)")
    }

    .alert(isPresented: $playAgain) {
        Alert(title: Text("New Message"), primaryButton: .default(Text("Try Again"), action: resetGame), secondaryButton: .destructive(Text("Quit"), action: quitgame))
    }

Any help appreciated.

Regards

2      

@iwaddo - just attach the second alert to some other View, its an issue where two simultaneous alerts do not respond ... good luck

2      

or have one alert displaying different information depending on what happened...

2      

hi,

the placement of .alert() modifiers makes a lot of difference. i think this post by Sarun provides an explanation for presenting multiple alerts in the most common situations.

if you need something more involved, you could look into using .alert(_:isPresented:presenting:actions:), where you can set up a single alert modifier on an entire view, but trigger it for different scenarios by defining an appropriate value for the presenting parameter. (this is along the lines of what what @GakkieNL is suggesting.)

something like this is fairly generic:

.alert(alertData.title, isPresented: $isAlertShowing, presenting: alertData) {
    item in item.actionsView()
} message: {
    item in item.messageView()
}

where the definition of alertData is

@State private var alertData = AlertData()

and AlertData is a base-level class defined with a default title (String), an actionsView (AnyView), and a messageView (AnyView).

Added after original reply: the AlertData class must be Identifiable.

any time you want to present an alert, you follow this sequence:

alertData = YourSpecialAlertDataType(/* initialization parameters here */) 
isAlertShowing = true

where YourSpecialAlertDataType is a subclass of AlertData and its initialization parameters are enough to determine the title, messageView, and actionsView needed for the alert.

however, that may be a little bit more than what you need.

hope that helps,

DMG

3      

Thank you, this is exactly what I need, different scenarios from a single alert modifier.

I need a message and continue when showingScore is true and a different message with different buttons and actions when playAgain is true.

I will give it a try.

Thank you for your help

2      

There is also this way. By have one alert and passing in the error title and details depending on the error you want to show.

struct ContentView: View {
    @State private var showAlert = false
    @State private var title = ""
    @State private var message = ""

    var body: some View {
        VStack {
            Button("Error One") {
                title = "Error One"
                message = "The is attached to the button one"
                showAlert = true
            }
            .buttonStyle(.bordered)

            Button("Error Two") {
                title = "Error Two"
                message = "The is attached to the button two"
                showAlert = true
            }
            .buttonStyle(.bordered)
        }
        .alert(title, isPresented: $showAlert) {

        } message: {
            Text(message)
        }

    }
}

2      

Have by playing around with alerts and came up with this.

Add a struct That has all the alert details in

struct AlertItem: Identifiable {
    let id = UUID()
    var title: String
    var message: String

    static let alertOne = AlertItem(
        title: "Alert One",
        message: "This is Alert One Message")

    static let alertTwo = AlertItem(
        title: "Alert Two",
        message: "This is Alert Two Message")

    static let alertThree = AlertItem(
        title: "Alert Three",
        message: "This is Alert Three Message")
}

Then when you want to call the alert have one Bool to trigger the alert and a optional alertItem so you can then say which alert to show

struct ContentView: View {
    @State private var showAlert = false
    @State private var alertItem: AlertItem?

    var body: some View {
        VStack {
            Button("Alert One") {
                alertItem = .alertOne // <- type of alert to show
                showAlert = true
            }

            Button("Alert Two") {
                alertItem = .alertTwo
                showAlert = true
            }

            Button("Alert Three") {
                alertItem = .alertThree
                showAlert = true
            }
        }
        .buttonStyle(.bordered)
        .padding()
        .alert(
            alertItem?.title ?? "", // <- unwrap optional "" will never show
            isPresented: $showAlert,
            presenting: alertItem)
        { _ in // Add buttons (no button will still use "Ok" button)
            Button("Understood") { }
        } message: { alertItem in
            Text(alertItem.message)
        }
    }
}

The advange of this is all alert detail are in one place and less in the Views

3      

Some hidden gems here, very informative indeed, this post is to be bookmarked .. thanks @NigelGee and @delawaremathguy

2      

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