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Service/AlertService.cs

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+using System.Net.WebSockets;
+using Navigation_Between.Interface;
+
+namespace Navigation_Between.Service;
+public class AlertService : IAlertService {
+    public async Task ShowAlert(string title, string message, string button){
+        // Application.Current.MainPage jest już przestarzale, dlatego stosujemy teraz..:
+        var currentPage = Application.Current?.Windows.FirstOrDefault()?.Page;
+        if(currentPage != null)
+            await currentPage.DisplayAlert(title, message, button);
+    }
+
+    // Typ okna, które pozwala na pobranie od użytkownika danych z inputa
+    public async Task<string> ShowPrompt(string title, string message, string accept, string cancel, string placeholder) {
+        var currentPage = Application.Current?.Windows.FirstOrDefault()?.Page;
+        return currentPage != null ? await currentPage.DisplayPromptAsync(title, message, accept, cancel, placeholder) : "error";  
+    }
+
+    // Typ okna, w którym dajemy wybory od użytkownika
+    public async Task<string> ShowAction(string title, string cancel, string destruction, string[] options){
+        var currentPage = Application.Current?.Windows.FirstOrDefault()?.Page;
+        return currentPage != null ? await currentPage.DisplayActionSheet(title, cancel, destruction, options) : "error";
+    }
+}