TaskExtensions.cs

using System;
using System.Threading;
using System.Threading.Tasks;
using UnityEngine;

public class TaskExtensions
{

    /**
    
    await TaskExtensions.WaitUntil(() => b, eventActCts.Token);

    **/

    // https://stackoverflow.com/questions/69282112/how-to-do-waituntil-in-async
    public static async Task WaitUntil(Func<bool> predicate, CancellationToken cancellationToken = default)
    {
        while (!predicate() && !cancellationToken.IsCancellationRequested && Application.isPlaying)
        {
            //Debug.Log("Yield");
            await Task.Yield();
            cancellationToken.ThrowIfCancellationRequested();
        }
        await Task.CompletedTask;
    }

    // Delay
    public static async Task Delay(int millisecondsDelay, CancellationToken cancellationToken)
    {
        if(cancellationToken == null) { return; }

        var startTime = Time.time;
        var elapsedTime = 0f;
        while (elapsedTime < millisecondsDelay / 1000f && Application.isPlaying)
        {
            //cancellationToken.ThrowIfCancellationRequested();
            if (cancellationToken.IsCancellationRequested)
            {
                break;
            }
            elapsedTime = Time.time - startTime;
            await Task.Yield();
        }

        cancellationToken.ThrowIfCancellationRequested();
        await Task.CompletedTask;
    }

    public static Task Delay(int millisecondsDelay)
    {
        return Delay(millisecondsDelay, CancellationToken.None);
    }

}