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。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。