Unity截屏以及根据相机画面截图

在游戏开发和软件开发中，经常需要截图的功能，分带UI的截图和不带UI的截图功能。代码如下：

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public static class ScreenShotForCamera{

    public static void CaptureScreen(string _path = null)
    {
        if (_path == null)
            _path = "Screenshot.png";

        Application.CaptureScreenshot(_path, 0);
    }

    public static Texture2D CaptureScreen(Rect rect, bool _isCreatePhoto = false, string _path = null)
    {
        // 先创建一个的空纹理，大小可根据实现需要来设置  
        Texture2D screenShot = new Texture2D((int)rect.width, (int)rect.height, TextureFormat.RGB24, false);

        // 读取屏幕像素信息并存储为纹理数据，  
        screenShot.ReadPixels(rect, 0, 0);
        screenShot.Apply();

        // 然后将这些纹理数据，成一个png图片文件  
        if (_isCreatePhoto)
        {
            if(_path == null)
                _path = Application.dataPath + "/Screenshot.png";

            byte[] bytes = screenShot.EncodeToPNG();
            string filename = _path;
            System.IO.File.WriteAllBytes(filename, bytes);
            Debug.Log(string.Format("截屏了一张图片: {0}", filename));
        }

        // 最后，我返回这个Texture2d对象，这样我们直接，所这个截图图示在游戏中，当然这个根据自己的需求的。  
        return screenShot;
    }

    //
    public static Texture2D CaptureCamera(ref Camera _camera, Rect _rect, int _destX, int _destY, bool _isCreatePhoto = false, string _path = null)
    {
        RenderTexture renderTexture = new RenderTexture((int)_rect.width, (int)_rect.height, 24, RenderTextureFormat.ARGB32);
        _camera.targetTexture = renderTexture;
        _camera.Render();

        // 激活这个renderTexture, 并从中中读取像素
        RenderTexture.active = _camera.targetTexture;
        Texture2D screenShot = new Texture2D((int)_rect.width, (int)_rect.height, TextureFormat.ARGB32, false);
        screenShot.ReadPixels(_rect, _destX, _destY);   //从（_destX,_destY）坐标开始读取_rect大小的图片
        screenShot.Apply();

        //重置参数
        //_camera.targetTexture = null;
        RenderTexture.active = null;
        //GameObject.Destroy(renderTexture);

        //生成PNG图片
        if (_isCreatePhoto)
        {
            if (_path == null)
                _path = Application.dataPath + "/Screenshot.png";

            byte[] bytes = screenShot.EncodeToPNG();
            string filename = _path;
            System.IO.File.WriteAllBytes(filename, bytes);
            Debug.Log(string.Format("截屏了一张照片: {0}", filename));
        }

        return screenShot;
    }
}