unity全屏截图

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

public class Jietu : MonoBehaviour {

    //ui
    //ui挂在一个unlitTexture材质球上
    public Image img;

    // Use this for initialization
    void Start () {

    }

    bool grab;
    // Update is called once per frame
    void Update () {
        if (Input.GetKeyDown(KeyCode.Space))
        {
            grab = true;
            StartCoroutine(OnPostRender1());//方案1
        }
    }

    //还有种是用postRender方案，但是脚本需要挂在摄像机上
    private IEnumerator OnPostRender1()
    {
        yield return new WaitForEndOfFrame();
        if(grab)
        {
            CaptureScreen();
        }
    }

    //使用这种方案需要脚本挂在摄像机上，生命周期会自动调用
    public void OnPostRender()
    {
        if (grab)
        {
            CaptureScreen();
        }
    }

    //此函数要么在携程，要么在OnPostRender，不可直接调用，直接调用尺寸过大会报错
    void CaptureScreen()
    {
        Texture2D texture = ScreenCapture.CaptureScreenshotAsTexture();
        img.material.mainTexture = texture;
        //刷新
        img.enabled = false;
        img.enabled = true;
    }
}