powerfun-unity/Assets/Scripts/UI/Prefab/Mail/MailReceiver.cs

using Assets.Scripts;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class MailReceiver : MonoBehaviour
{
    // Start is called before the first frame update
    private static MailReceiver _instance = null;

    public static bool Exists()
    {
        return _instance != null;
    }

    public static MailReceiver Instance()
    {
        if (!Exists())
        {
            throw new Exception("UnityMainThreadDispatcher could not find the UnityMainThreadDispatcher object. Please ensure you have added the MainThreadExecutor Prefab to your scene.");
        }
        return _instance;
    }

    void Awake()
    {
        if (_instance == null) 
        {
            _instance = this;
        }
        DontDestroyOnLoad(gameObject);
    }
    
    void Start()
    {
        
    }

    float timer = 10f;
    // Update is called once per frame
    void Update()
    {
        timer -= Time.deltaTime;
        if (timer < 0) 
        {
            if (!SceneManager.GetActiveScene().name.Contains("Login"))
            {
                GetMessage();
            }
            timer += 10;
        }
    }

    public async Task GetMessage()
    {
        var res = await ConfigHelper.mailApi.GetList(0, 100, 0);
        if (res.result) 
        {
            App.CurrentUserMails = res.data;
            App.hasNotRead = res.data.Count(x => !x.IsRead) > 0;
        }
    }
}