⭐Unity 选定区域截图

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

public class LocalFileServer : MonoBehaviour
{
    public RectTransform UIRect;
    public string outputImagePath; // 输出硬件图片的路径
    private void Start()
    {
        outputImagePath = Application.streamingAssetsPath + "/out.png";
        ShootDouble();
    }
   
    public void ShootDouble()
    {
        IEnumerator coroutine = CaptureByUI(UIRect, outputImagePath);
        StartCoroutine(coroutine);
    }
    /// <summary>
    /// 
    /// </summary>
    /// <param name="UIRect"></param>
    /// <param name="mFileName"></param>
    /// <returns></returns>
    public IEnumerator CaptureByUI(RectTransform UIRect, string mFileName)
    {
        //等待帧画面渲染结束
        yield return new WaitForEndOfFrame();

        int width = (int)(UIRect.rect.width);
        int height = (int)(UIRect.rect.height);

        Texture2D tex = new Texture2D(width, height, TextureFormat.RGB24, false);

        //左下角为原点（0, 0）
        float leftBtmX = UIRect.transform.position.x + UIRect.rect.xMin;
        float leftBtmY = UIRect.transform.position.y + UIRect.rect.yMin;

        //从屏幕读取像素, leftBtmX/leftBtnY 是读取的初始位置,width、height是读取像素的宽度和高度
        tex.ReadPixels(new UnityEngine.Rect(leftBtmX, leftBtmY, width, height), 0, 0);
        //执行读取操作
        tex.Apply();
        byte[] bytes = tex.EncodeToPNG();
        //保存
        System.IO.File.WriteAllBytes(mFileName, bytes);
    }
}