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

struct ContentView: View {
    @State var customAlert: CustomAlertModel?
    var body: some View {
        
        Button("Show custom alert") {
            customAlert = CustomAlertModel(
                title: "Pop Up",
                message: "Some message here..."
            )
        }
        .popUp(item: $customAlert) { viewModel in
            CustomAlert(viewModel: viewModel)
        }
    }
}

struct CustomAlert: View {
    let viewModel: CustomAlertModel
    var body: some View {
        VStack {
            Text(viewModel.title)
                .font(.title)
            Text(viewModel.message)
        }
        .padding(40)
        .background(
            RoundedRectangle(cornerRadius: 30)
                .foregroundStyle(.white)
        )
    }
}

struct ContentView: View {
    @State var customAlert: CustomAlertModel?
    var body: some View {
        
        Group {
            // ...
        }
        .popUp(item: $customAlert) { viewModel in
            CustomAlert(viewModel: viewModel)
        }
        .popUpBackgroundMaterial(.ultraThin)
    }
}