unity加載本地圖片輪播

using System.IO;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class Picplay : MonoBehaviour
{

    Image m_image;
    int picindex;//圖片名稱
    string filepath;//圖片所在文件夾
    public float loadspeed;//每幀加載速度 
    bool bload;
    bool bsub;

    // Use this for initialization
    void Start()
    {
        m_image = GameObject.Find("Image").GetComponent<Image>();
        filepath = Application.streamingAssetsPath;

        m_image.fillAmount = 0;
        bload = false;
        bsub = false;

        Picplaycontrol(0);
    }

    // Update is called once per frame
    void Update()
    {
        if (bload)
        {
            m_image.fillAmount += loadspeed;
            if (m_image.fillAmount == 1) bload = false;
        }
        if (bsub)
        {
            m_image.fillAmount -= loadspeed;
            if (m_image.fillAmount == 0) bsub = false;
        }
    }


	/// <summary>
	/// 調用輪播
	/// </summary>
	/// <param name="i">圖片名稱</param>
    public void Picplaycontrol(int i)
    {
        picindex = i;
        print(i);
        InvokeRepeating("Loadpic", 0, 5f);
    }
    void Loadpic()
    {

        string[] dirs = System.IO.Directory.GetFileSystemEntries(filepath);
        if (picindex > dirs.Length)
        {
            picindex = 0;
        }

        string picpath = filepath + "/" + picindex.ToString() + ".png";
        if (File.Exists(picpath))
        {
            print(2);
            byte[] bt = File.ReadAllBytes(picpath);
            Texture2D t2d = new Texture2D(1920, 1080);
            t2d.LoadImage(bt);
            Sprite sprite = Sprite.Create(t2d, new Rect(0, 0, t2d.width, t2d.height), Vector2.zero);
            m_image.sprite = sprite;
            Invoke("Setboolload", 0.2f);//因爲加載圖片需要時間
            Invoke("Setboolsub", 3f);
            picindex++;
        }

    }
    public void Setboolload()
    {
        bload = true;
    }
    public void Setboolsub()
    {
        bsub = true;
    }

}