UGUI 加载图片

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图片是动态加载的，然后转换为sprite赋值到ugui的按钮上

代码如下

using UnityEngine;

using System.Collections;

using System.IO;

using UnityEngine.UI;

public class UITexLoader : MonoBehaviour

{

    public string texname;

    private Texture2D m_Tex;

    private void LoadFromFile(string path)

    {

        m_Tex = new Texture2D(1, 1);

        m_Tex.LoadImage(ReadPNG(path));

    }

    private byte[] ReadPNG(string path)

    {

        FileStream fileStream = new FileStream(path, FileMode.Open, System.IO.FileAccess.Read);

        fileStream.Seek(0, SeekOrigin.Begin);

        byte[] binary = new byte[fileStream.Length]; //创建文件长度的buffer

        fileStream.Read(binary, 0, (int)fileStream.Length);

        fileStream.Close();

        fileStream.Dispose();

        fileStream = null;

        return binary;

    }

    // Use this for initialization

    void Start()

    {

        LoadFromFile(texname);

        Sprite tempSprite = new Sprite();

        tempSprite = Sprite.Create(m_Tex, new Rect(0, 0, m_Tex.width, m_Tex.height), new Vector2(0, 0));

        GetComponent<Image>().sprite  =tempSprite;

    }

	// Update is called once per frame

	void Update ()

    {

	}

}