Unity 扫描 二维码

 Unity扫描二维码有2中有以下两种实现方式：
   1.使用原生开发，然后Unity里调用
   2.使用Unity开发，利用zxing.net解码
 比较2种方式，1的开发难度较高，需要相关android和ios开发的知识才能实现界面定制，所以方法2会比较适用，界面定制简单，也不用复杂去开发原生插件。下面来说下第二种开发怎么做。
 首先需要一个下载一个zxing.net库，大家可以去官网下载，地址：点击打开链接。

  原理就是使用WebCamTexutre调用摄像头，将WebCamTexutre赋到一张UI rawimage上面，每一帧读取，给zxing解码 

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

namespace miwu
{

public class QRScaner : MonoBehaviour
{

public delegate void OnDecodSuccess(string data);
public OnDecodSuccess OnDecodSuccessHandler;
public int BlockWidth = 350;
public Vector2 UIResolution = new Vector3(1334f, 750f);      //UI默认开发分辨率
private Vector2 rectTop;
private WebCamTexture webCamTexture;
private bool Decoding = false;
BarcodeReader mBarcodeReader = new BarcodeReader();
private Texture2D decodeTex;
private void Start()
{
BlockWidth =(int)( BlockWidth / UIResolution.y * Screen.height);    //自适应扫描框
rectTop = new Vector2((Screen.width - BlockWidth) / 2, (Screen.height - BlockWidth) / 2);
webCamTexture = new WebCamTexture(Screen.width, Screen.height, 60);
this.GetComponent<RawImage>().texture = webCamTexture;
StartScanQRCode();

}

/// <summary>
/// 开始扫描
/// </summary>
public void StartScanQRCode()
{
Decoding = true;
webCamTexture.Play();
StartCoroutine("DecodingQRCode");

}

/// <summary>
/// 停止扫描
/// </summary>
public void StopScanQRCode()
{
Decoding = false;
StopCoroutine("DecodingQRCode");
webCamTexture.Stop();
}

/// <summary>
/// 重新开始解码
/// </summary>
public void ReDecode()
{
Decoding = true;
StartCoroutine("DecodingQRCode");
}

/// <summary>
/// 是否解码中
/// </summary>
/// <returns></returns>
public bool isDecoding()
{
return Decoding;
}

IEnumerator DecodingQRCode()
{
while (Decoding)
{
yield return new WaitForEndOfFrame();
decodeTex = new Texture2D(BlockWidth, BlockWidth, TextureFormat.ARGB32, true);
decodeTex.ReadPixels(new Rect(rectTop.x, rectTop.y, BlockWidth, BlockWidth), 0, 0, false);
//byte[] bytes = decodeTex.EncodeToPNG();
//System.IO.File.WriteAllBytes("test.png", bytes);
//Decoding = false;
//yield break;
var data = mBarcodeReader.Decode(decodeTex.GetPixels32(), decodeTex.width, decodeTex.height);
if (data != null)
{
OnDecodSuccessHandler(data.Text);
Decoding = false;
yield break;
}
}
}
}
}