battlearray_client/Assets/Scripts/UI/Battle/SwapBtn.cs

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

public class SwapBtn : MonoBehaviour
{

	public Image lightImage;
	private Craft craft;

	public void SetCraft(Craft craft)
	{
		this.craft = craft;
		FixedUpdate () ;
	}
	
	void FixedUpdate () 
	{
		if(craft != null)
		{
			if(craft.GetSwapManager().isPreparingSwap || !craft.IsLeaveDamage())
			{
				lightImage.fillAmount = 0;
			}
			else
			{
				lightImage.fillAmount = craft.GetSwapManager().GetSwapCoolDown() / SwapManager.SWAP_CD;
			}
		}
	}
}