Unity3D更新进度条

/**  *Copyright(C) 2017 by HT307035570  *All rights reserved.  *FileName:     Btn.cs  *Author:       Joel  *Version:      1.0  *UnityVersion：5.6.1f1  *Date:         2017-07-12  *Description:  触碰更新进度条  *History: */using System.Collections;using System.Collections.Generic;using UnityEngine;using UnityEngine.UI;public class Btn : MonoBehaviour {    public static Btn instance;    public bool flag = false;//定义flag开关初始为false    public float FiA;//定义变量接受fill aount 值    void Awake()    {        if (instance != null)        {            Destroy(this.gameObject);        }        else        {           instance= this;        }    }    void Start()    {        times = transform.GetComponent<Image>().fillAmount;    }    /// <summary>    /// 触发按钮时打开开关，否则开关关闭，初始数值    /// </summary>    /// <param name="other">触碰到的按钮</param>    private void OnTriggerEnter2D(Collider2D other)    {        if (other.tag == "Hand")        {            flag = true;        }        else        {            flag = false;            transform.GetComponent<Image>().fillAmount = 0;            FiA = transform.GetComponent<Image>().fillAmount;        }    }    /// <summary>    /// 当离开开关，关闭开关初始化数值    /// </summary>    /// <param name="other">离开的按钮</param>    private void OnTriggerExit2D(Collider2D other)    {        if (other.tag == "Hand")        {            falg = false;            transform.GetComponent<Image>().fillAmount = 0;            FiA= transform.GetComponent<Image>().fillAmount;        }    }    /// <summary>    /// 选中按钮后执行的方法    /// </summary>    private void FixedUpdate()    {        if (flag && FiA<1)        {            transform.GetComponent<Image>().fillAmount += 0.1f * Time.deltaTime;            FiA = transform.GetComponent<Image>().fillAmount;        }        if(FiA>=1&&flag)        {            flag = false;            //进度条充满后执行的方法              click();        }    }  //需要实现的方法  public void click()    {    }}