M3rtix's questions

我正在使用 .NET MAUI MVVM 开发一个简单的数学练习游戏。我希望在每次玩游戏时关闭应用程序并重新输入后更新游戏主页上的高分值。什么页面以及如何执行此操作？

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;
    }
}

乘法PageViewModel.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));
        }
    }
}

主页.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>

我想显示我在 上获得的分数MultiplicationPage信息GameOverPage。我想我已经从中提取了数据PlayerModal，但它仍然没有显示。

GameOverPage.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.GameOverPage"
             x:DataType="viewModels:GameOverPageViewModel"
             Shell.BackButtonBehavior="{BackButtonBehavior IsVisible=False, IsEnabled=False}"
             Title="GameOverPage">
    <VerticalStackLayout Spacing="60">
        <Label Text="GAME OVER AMK!"
               VerticalOptions="Center" 
               HorizontalOptions="Center" />
        <Label Text="Score"             
               VerticalOptions="Center" 
               HorizontalOptions="Center"/>
        <Label Text="{Binding playerModal.Score}"            
               VerticalOptions="Center" 
               HorizontalOptions="Center"/>
        <Button Text="Try Again" Command="{Binding TryAgainCommand}"/>
        <Button Text="Main Menu" Command="{Binding MainMenuCommand}"/>
    </VerticalStackLayout>
</ContentPage>

GameOverPageViewModel.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 GameOverPageViewModel : BaseViewModel
    {
        public ObservableCollection<PlayerModal> PlayerDetails { get; set; } = new ObservableCollection<PlayerModal>();
        public PlayerModal playerModal { get; set; } = new PlayerModal();
        public GameOverPageViewModel(INavigationService navigationService) : base(navigationService)
        {

        }
        [RelayCommand]
        public void TryAgain()
        {
            NavigationService.NavigateToAsync(nameof(MultiplicationPage));
        }
        [RelayCommand]
        async Task MainMenu()
        {
            await Shell.Current.GoToAsync("../../..");
        }
    }
}

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;
    }
}

乘法PageViewModel.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; } = new 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
                }
            }
        }

        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 = 0;
                    }
                }

                GenerateQuestion();
            }

            playerModal.Answer = "";

        }

        public async void GameOver()
        {
            // Check earned score and update new high score
            if (playerModal.Score > playerModal.HighScore)
            {
                playerModal.HighScore = playerModal.Score;
            }
            await NavigationService.NavigateToAsync(nameof(GameOverPage));
        }
    }
}