using UnityEngine;
using UnityEngine.UI;
using System.Collections;

public class UIFader : MonoBehaviour
{
    public CanvasGroup canvasGroup;
    public float fadeSpeed = 5f;

    public void FadeIn()
    {
        StopAllCoroutines();
        StartCoroutine(Fade(1));
    }

    public void FadeOut()
    {
        StopAllCoroutines();
        StartCoroutine(Fade(0));
    }

    IEnumerator Fade(float target)
    {
        while (Mathf.Abs(canvasGroup.alpha - target) > 0.01f)
        {
            canvasGroup.alpha = Mathf.Lerp(canvasGroup.alpha, target, Time.deltaTime * fadeSpeed);
            yield return null;
        }

        canvasGroup.alpha = target;
    }
}