gather-and-defend/Assets/Scripts/CloudAnimation.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using static Codice.Client.Common.WebApi.WebApiEndpoints;

public class CloudAnimation : MonoBehaviour
{
    [System.Serializable]
    public class Properties
    {
        public float fadeInTime = 1;
        public float stayTime = 1;
        public float fadeOutTime = 1;
        public float speed = 1;
    }
    CanvasGroup canvasGroup;
    public Properties properties;
    private Coroutine coroutine;
    // Start is called before the first frame update
    void Start()
    {
        canvasGroup = GetComponent<CanvasGroup>();
        coroutine = StartCoroutine(AnimateCloud());
    }

    public void Kill()
    {
        StopCoroutine(coroutine);
        StartCoroutine(KillCloud());
    }
    IEnumerator AnimateCloud()
    {
        
        canvasGroup.alpha = 0;
        yield return canvasGroup.FadeTo(1, properties.fadeInTime);
        yield return new WaitForSeconds(properties.stayTime);
        yield return KillCloud();
}
    IEnumerator KillCloud()
    {
        yield return canvasGroup.FadeTo(0, properties.fadeOutTime);
        Destroy(gameObject);
    }

    // Update is called once per frame
    void Update()
    {
        transform.position += properties.speed * Time.deltaTime * Vector3.left * Camera.main.orthographicSize;
    }
}