Estou desenvolvendo um jogo simples de prática matemática com .NET MAUI MVVM. Eu quero que o valor highScore na página principal do jogo seja atualizado depois que eu fechar o aplicativo e inseri-lo novamente toda vez que eu jogar. Qual página e como posso fazer isso?
PlayerModal.cs
using CommunityToolkit.Mvvm.ComponentModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MauiApp2.Models
{
public partial class PlayerModal : ObservableObject
{
[ObservableProperty]
int score;
[ObservableProperty]
int highScore;
[ObservableProperty]
int timeReaming;
[ObservableProperty]
int correctAnswer;
[ObservableProperty]
string answer;
[ObservableProperty]
string question;
}
}
MultiplicationPageViewModel.cs
using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using MauiApp2.Models;
using MauiApp2.Services;
using MauiApp2.Views;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Input;
namespace MauiApp2.ViewModels
{
public partial class MultiplicationPageViewModel : BaseViewModel
{
public ObservableCollection<PlayerModal> PlayerDetails { get; set; } = new ObservableCollection<PlayerModal>();
public PlayerModal playerModal { get; set; } = BaseViewModel.PlayerModal;
public ICommand SubmitAnswerCommand { get; }
public MultiplicationPageViewModel(INavigationService navigationService) : base(navigationService)
{
playerModal.Score = 0;
playerModal.TimeReaming= 60;
SubmitAnswerCommand = new Command(SubmitAnswer);
// Create a question as an example
GenerateQuestion();
// Start the timer
StartTimer();
}
[RelayCommand]
public void GenerateQuestion()
{
Random random = new Random();
int number1 = random.Next(1, 11); // a random number between 1 and 10
int number2 = random.Next(1, 11); // a random number between 1 and 10
// playerModal.Answer = (number1 * number2).ToString(); Automatic Answer
playerModal.Question = $"{number1} x {number2}";
playerModal.CorrectAnswer = number1 * number2;
}
public async void StartTimer()
{
while (true)
{
await Task.Delay(1000); // wait 1 sec
playerModal.TimeReaming--;
if (playerModal.TimeReaming == 0)
{
GameOver(); // Finish the game when time is up
playerModal.TimeReaming = 60;
}
}
}
public void SubmitAnswer()
{
if (int.TryParse(playerModal.Answer, out int userAnswer))
{
int correctAnswer = playerModal.CorrectAnswer;
if (userAnswer == correctAnswer)
{
playerModal.Score += 10;
playerModal.TimeReaming += 5;
}
else
{
playerModal.Score -= 10;
playerModal.TimeReaming -= 55;
// Negative score and time control
if (playerModal.Score < 0)
{
playerModal.Score = 0;
}
if (playerModal.TimeReaming <= 0)
{
GameOver();
playerModal.TimeReaming = 60;
}
}
GenerateQuestion();
}
playerModal.Answer = "";
}
public void GameOver()
{
// Check earned score and update new high score
if (playerModal.Score > playerModal.HighScore)
{
playerModal.HighScore = playerModal.Score;
// Save the high score to preferences
Preferences.Default.Set("HighScore", playerModal.HighScore);
}
NavigationService.NavigateToAsync(nameof(GameOverPage));
}
}
}
HomePageViewModel.cs
using CommunityToolkit.Mvvm.Input;
using MauiApp2.Models;
using MauiApp2.Services;
using MauiApp2.Views;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace MauiApp2.ViewModels
{
public partial class HomePageViewModel : BaseViewModel
{
public ObservableCollection<PlayerModal> PlayerDetails { get; set; } = new ObservableCollection<PlayerModal>();
public PlayerModal playerModal { get; set; } = BaseViewModel.PlayerModal;
public HomePageViewModel(INavigationService navigationService) : base(navigationService)
{
// Load the high score from preferences
int highScore = Preferences.Default.Get("HighScore", 0);
// Set the high score on the view model
playerModal.HighScore = highScore;
}
[RelayCommand]
public void Play()
{
NavigationService.NavigateToAsync(nameof(SelectionPage));
}
}
}
HomePage.xaml
<?xml version="1.0" encoding="utf-8" ?>
<ContentPage xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
xmlns:viewModels="clr-namespace:MauiApp2.ViewModels"
xmlns:models="clr-namespace:MauiApp2.Models"
x:Class="MauiApp2.Views.HomePage"
x:DataType="viewModels:HomePageViewModel"
Title="Home">
<VerticalStackLayout VerticalOptions="Center">
<Label
Text="MATH GAME"
VerticalOptions="Center"
HorizontalOptions="Center"
FontAttributes="Bold"
FontSize="50"/>
<Label
Text="High Score"
Margin="0,15,0,0"
VerticalOptions="Center"
HorizontalOptions="Center"
FontAttributes="None"
FontSize="40"/>
<Label
Text="{Binding playerModal.HighScore}"
VerticalOptions="Center"
HorizontalOptions="Center"
FontAttributes="Bold"
FontSize="30"/>
<Button Text="Play"
FontAttributes="Bold"
FontSize="20"
Margin="90,30,90,0"
Command="{Binding PlayCommand}"/>
</VerticalStackLayout>
</ContentPage>
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