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;
                }
            }
        }
    }
}