Shegotwet/Assets/Scripts/UI/ToastUI.cs

using TMPro;
using UnityEngine;

public class ToastUI : MonoBehaviour
{
    public RectTransform rt_bg;
    public TextMeshProUGUI t_mgs;

    public void Set(string text)
    {
        gameObject.SetActive(true);
        t_mgs.text = text;
        rt_bg.sizeDelta = new Vector2(rt_bg.sizeDelta.x, t_mgs.preferredHeight + 50);

        if (IsInvoking()) CancelInvoke();
        Invoke("Off", 3f);
    }

    void Off() { gameObject.SetActive(false); }
}