Unity实现多平台二维码扫描

在unity里做扫二维码的功能，虽然有插件，但是移动端UI一般不能自定义，所以后来自已做了一个，直接在c#层扫描解析，UI上就可以自己发挥了。

上代码：

这个是调用zxing的脚本。

using UnityEngine;
using System.Collections;
using ZXing;
using ZXing.QrCode;

public class QR {
  /// <summary>
  /// 解析二维码
  /// </summary>
  /// <param name="tex"></param>
  /// <returns></returns>
  public static string Decode(Texture2D tex) {
    return DecodeColData(tex.GetPixels32(), tex.width, tex.height); //通过reader解码
  }
  public static string DecodeColData(Color32[] data, int w, int h) {
    BarcodeReader reader = new BarcodeReader();
    Result result = reader.Decode(data, w, h); //通过reader解码
    //GC.Collect();
    if (result == null)
      return "";
    else {
      return result.Text;
    }
  }
  /// <summary>
  /// 生成二维码
  /// </summary>
  /// <param name="content"></param>
  /// <param name="len"></param>
  /// <returns></returns>
  public static Texture2D GetQRTexture(string content, int len = 256) {
    var bw = new BarcodeWriter();
    bw.Format = BarcodeFormat.QR_CODE;
    bw.Options = new ZXing.Common.EncodingOptions() {
      Height = len,
      Width = len
    };
    var cols = bw.Write(content);
    Texture2D t = new Texture2D(len, len);
    t.SetPixels32(cols);
    t.Apply();
    return t;
  }
}

然后是封装：

using UnityEngine;
using System.Collections;
using System;
using UnityEngine.UI;
using System.Timers;
/// <summary>
/// 二维码解析工具
/// 关键函数:
///   public static QRHelper GetInst()                   --得到单例
///   public event Action<string> OnQRScanned;               --扫描回调
///   public void StartCamera(int index)                  --启动摄像头
///   public void StopCamera()                       --停止摄像头
///   public void SetToUI(RawImage raw,int UILayoutW,int UILayoutH)     --把摄像机画面设置到一个rawimage上并使它全屏显示
/// </summary>
public class QRHelper {

  public event Action<string> OnQRScanned;

  private static QRHelper _inst;
  public static QRHelper GetInst() {
    if (_inst == null) {
      _inst = new QRHelper();
    }
    return _inst;
  }
  private int reqW = 640;
  private int reqH = 480;
  private WebCamTexture webcam;

  Timer timer_in, timer_out;
  /// <summary>
  /// 启动摄像头
  /// </summary>
  /// <param name="index">手机后置为0，前置为1</param>
  public void StartCamera(int index) {
    StopCamera();
    lock (mutex) {
      buffer = null;
      tbuffer = null;
    }
    var dev = WebCamTexture.devices;
    webcam = new WebCamTexture(dev[index].name);
    webcam.requestedWidth = reqW;
    webcam.requestedHeight = reqH;
    webcam.Play();
    stopAnalysis = false;

    InitTimer();
    timer_in.Start();
    timer_out.Start();
  }
  /// <summary>
  /// 停止
  /// </summary>
  public void StopCamera() {
    if (webcam!=null) {
      webcam.Stop();
      UnityEngine.Object.Destroy(webcam);
      Resources.UnloadUnusedAssets();
      webcam = null;
      stopAnalysis = true;

      timer_in.Stop();
      timer_out.Start();
      timer_in = null;
      timer_out = null;
    }
  }
  /// <summary>
  /// 把摄像机画面设置到一个rawimage上并使它全屏显示
  /// </summary>
  /// <param name="raw">rawimage</param>
  /// <param name="UILayoutW">UI布局时的宽度</param>
  /// <param name="UILayoutH">UI布局时的高度</param>
  public void SetToUI(RawImage raw,int UILayoutW,int UILayoutH){
    raw.GetComponent<RectTransform>().sizeDelta = GetWH(UILayoutW,UILayoutH);
    int d = -1;
    if (webcam.videoVerticallyMirrored) {
      d = 1;
    }
    raw.GetComponent<RectTransform>().localRotation *= Quaternion.AngleAxis(webcam.videoRotationAngle, Vector3.back);
    float scaleY = webcam.videoVerticallyMirrored ? -1.0f : 1.0f;
    raw.transform.localScale = new Vector3(1, scaleY * 1, 0.0f);
    raw.texture = webcam;
    raw.color = Color.white;
  }
  //在考虑可能旋转的情况下计算UI的宽高
  private Vector2 GetWH(int UILayoutW, int UILayoutH) {
    int Angle = webcam.videoRotationAngle;
    Vector2 init = new Vector2(reqW, reqH);
    if ( Angle == 90 || Angle == 270 ) {
      var tar = init.ScaleToContain(new Vector2(UILayoutH,UILayoutW));
      return tar;
    }
    else {
      var tar = init.ScaleToContain(new Vector2(UILayoutW, UILayoutH));
      return tar;
    }
  }
  private void InitTimer() {
    timer_in = new Timer(500);
    timer_in.AutoReset = true;
    timer_in.Elapsed += (a,b) => {
      ThreadWrapper.Invoke(WriteDataBuffer);
    };
    timer_out = new Timer(900);
    timer_out.AutoReset = true;
    timer_out.Elapsed += (a,b)=>{
      Analysis();
    };
  }
  private Color32[] buffer = null;
  private Color32[] tbuffer = null;
  private object mutex = new object();
  private bool stopAnalysis = false;

  int dw, dh;
  private void WriteDataBuffer() {
    lock (mutex) {
      if (buffer == null && webcam!=null) {
        buffer = webcam.GetPixels32();
        dw = webcam.width;
        dh = webcam.height;
      }
    }
  }
  //解析二维码
  private void Analysis() {
    if (!stopAnalysis) {
      lock (mutex) {
        tbuffer = buffer;
        buffer = null;
      }
      if (tbuffer == null) {
        ;
      }
      else {
        string str = QR.DecodeColData(tbuffer, dw, dh);
        tbuffer = null;
        if (!str.IsNullOrEmpty() && OnQRScanned != null) {
          ThreadWrapper.Invoke(() => {
            if (OnQRScanned!=null)
              OnQRScanned(str);
          });
        }
      }
    }
    tbuffer = null;
  }
}

调用方式如下，用了pureMVC，可能理解起来有点乱，也不能直接用于你的工程，主要看OnRegister和OnRemove里是怎么启动和停止的，以及RegQRCB、RemoveQRCB、OnQRSCcanned如何注册、移除以及响应扫描到二维码的事件的。在onregister中，由于ios上画面有镜象，所以把rawimage的scale的y置为了-1以消除镜像：

using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using PureMVC.Patterns;
using PureMVC.Interfaces;
/// <summary>
/// 扫描二维码界面逻辑
/// </summary>
public class ScanQRMediator : Mediator {

  AudioProxy audio;
 public QRView TarView {
    get {
      return base.ViewComponent as QRView;
    }
  }
  public ScanQRMediator()
    : base("ScanQRMediator") {
  }
  string NextView = "";
  bool isInitOver = false;
  int cameraDelay = 1;
  public override void OnRegister() {
    base.OnRegister();

    if (Application.platform == RuntimePlatform.IPhonePlayer) {
      cameraDelay = 5;
    }
    else {
      cameraDelay = 15;
    }

    audio = AppFacade.Inst.RetrieveProxy<AudioProxy>("AudioProxy");

    TarView.BtnBack.onClick.AddListener(BtnEscClick);

    QRHelper.GetInst().StartCamera(0);
    TarView.WebcamContent.rectTransform.localEulerAngles = Vector3.zero;
    CoroutineWrapper.EXEF(cameraDelay, () => {
      RegQRCB();
      QRHelper.GetInst().SetToUI(TarView.WebcamContent, 1536, 2048);
      if (Application.platform == RuntimePlatform.IPhonePlayer) {
        TarView.WebcamContent.rectTransform.localScale = new Vector3(1, -1, 0);
      }
      isInitOver = true;
    });
    UmengStatistics.PV(TarView);
    //暂停背景音乐
    audio.SetBGActive(false);
  }

  public override void OnRemove() {
    base.OnRemove();
    TarView.BtnBack.onClick.RemoveListener(BtnEscClick);
    if (NextView != "UnlockView") {
      audio.SetBGActive(true);
    }
    NextView = "";
    isInitOver = false;
  }
  bool isEsc = false;
  void BtnEscClick() {
    if (isEsc || !isInitOver) {
      return;
    }
    isEsc = true;

    TarView.WebcamContent.texture = null;
    TarView.WebcamContent.color = Color.black;
    RemoveQRCB();
    QRHelper.GetInst().StopCamera();

    CoroutineWrapper.EXEF(cameraDelay, () => {
      isEsc = false;
      if (Application.platform == RuntimePlatform.IPhonePlayer) {
        ToUserInfoView();
      }
      else {
        string origin = TarView.LastArg.SGet<string>("origin");
        if (origin == "ARView") {
          ToARView();
        }
        else if (origin == "UserInfoView") {
          ToUserInfoView();
        }
        else {
          ToARView();
        }
      }
    });
  }
  void ToARView() {
    AppFacade.Inst.RemoveMediator(this.MediatorName);
    ViewMgr.GetInst().ShowView(TarView, "ARView", null);
  }
  void ToUserInfoView() {
    AppFacade.Inst.RemoveMediator(this.MediatorName);
    ViewMgr.GetInst().ShowView(TarView, "UserInfoView", null);
    var v = ViewMgr.GetInst().PeekTop();
    var vc = new UserInfoMediator();
    vc.ViewComponent = v;
    AppFacade.Inst.RegisterMediator(vc);
  }
  int reg = 0;
  void RegQRCB() {
    if (reg == 0) {
      QRHelper.GetInst().OnQRScanned += OnQRScanned;
      reg = 1;
    }
  }
  void RemoveQRCB() {
    if (reg == 1) {
      QRHelper.GetInst().OnQRScanned -= OnQRScanned;
      reg = 0;
    }
  }
  bool isQRJump = false;
  void OnQRScanned(string qrStr) {
    if (isQRJump) {
      return;
    }
    isQRJump = true;

    TarView.WebcamContent.texture = null;
    TarView.WebcamContent.color = Color.black;
    RemoveQRCB();
    QRHelper.GetInst().StopCamera();
    NextView = "UnlockView";
    CoroutineWrapper.EXEF(cameraDelay, () => {
      isQRJump = false;
      AppFacade.Inst.RemoveMediator(this.MediatorName);
      audio.PlayScanedEffect();
#if YX_DEBUG
      Debug.Log("qr is :"+qrStr);
      Toast.ShowText(qrStr,1.5f);
#endif
      ViewMgr.GetInst().ShowView(TarView, "UnlockView", HashtableEX.Construct("QRCode", qrStr, "origin", TarView.LastArg.SGet<string>("origin")));
      var v = ViewMgr.GetInst().PeekTop();
      var vc = new UnlockMediator();
      vc.ViewComponent = v;
      AppFacade.Inst.RegisterMediator(vc);
    });
  }
}

最后，放上zxing.unity.dll,放在plugins里就可以了。

以上代码5.1.2测试可用。

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