ios swift3.0实现二维码扫描、生成、识别示例代码

基于swift3.0

1.扫描二维码

设置扫描会话,图层和输入输出

  //设置捕捉设备
    let device = avcapturedevice.defaultdevice(withmediatype: avmediatypevideo)

    do
    {
      //设置设备输入输出
      let input = try avcapturedeviceinput(device: device)

      let output = avcapturemetadataoutput()
      output.setmetadataobjectsdelegate(self, queue: dispatchqueue.main)

      //设置会话
      let scansession = avcapturesession()
      scansession.cansetsessionpreset(avcapturesessionpresethigh)

      if scansession.canaddinput(input)
      {
        scansession.addinput(input)
      }

      if scansession.canaddoutput(output)
      {
        scansession.addoutput(output)
      }

      //设置扫描类型(二维码和条形码)
      output.metadataobjecttypes = [
      avmetadataobjecttypeqrcode,
      avmetadataobjecttypecode39code,
      avmetadataobjecttypecode128code,
      avmetadataobjecttypecode39mod43code,
      avmetadataobjecttypeean13code,
      avmetadataobjecttypeean8code,
      avmetadataobjecttypecode93code]

      //预览图层
      let scanpreviewlayer = avcapturevideopreviewlayer(session:scansession)
      scanpreviewlayer?.videogravity = avlayervideogravityresizeaspectfill
      scanpreviewlayer?.frame = view.layer.bounds

      view.layer.insertsublayer(scanpreviewlayer!, at: 0)

      //自动对焦
      if (device?.isfocusmodesupported(.autofocus))!
      {
        do { try input.device.lockforconfiguration() } catch{ }
        input.device.focusmode = .autofocus
        input.device.unlockforconfiguration()
      }

      //设置扫描区域
      notificationcenter.default.addobserver(forname: nsnotification.name.avcaptureinputportformatdescriptiondidchange, object: nil, queue: nil, using: {[weak self] (noti) in
          output.rectofinterest = (scanpreviewlayer?.metadataoutputrectofinterest(for: self!.scanpane.frame))!
      })

      //保存会话
      self.scansession = scansession

    }
    catch
    {
      //摄像头不可用

      tool.confirm(title: "温馨提示", message: "摄像头不可用", controller: self)

      return
    }

开始扫描

    if !scansession.isrunning
    {
      scansession.startrunning()
    }

扫描结果在代理方法中

//扫描捕捉完成
extension scancodeviewcontroller : avcapturemetadataoutputobjectsdelegate
{

  func captureoutput(_ captureoutput: avcaptureoutput!, didoutputmetadataobjects metadataobjects: [any]!, from connection: avcaptureconnection!)
  {

    //停止扫描
    self.scanline.layer.removeallanimations()
    self.scansession!.stoprunning()

    //播放声音
    tool.playalertsound(sound: "noticemusic.caf")

    //扫完完成
    if metadataobjects.count > 0
    {

      if let resultobj = metadataobjects.first as? avmetadatamachinereadablecodeobject
      {

        tool.confirm(title: "扫描结果", message: resultobj.stringvalue, controller: self,handler: { (_) in
          //继续扫描
          self.startscan()
        })

      }

    }

  }

}

2.二维码生成

通过滤镜生成cgimage

    //2.二维码滤镜
    let contentdata = self.data(using: string.encoding.utf8)
    let fileter = cifilter(name: "ciqrcodegenerator")

    fileter?.setvalue(contentdata, forkey: "inputmessage")
    fileter?.setvalue("h", forkey: "inputcorrectionlevel")

    let ciimage = fileter?.outputimage


    //3.颜色滤镜
    let colorfilter = cifilter(name: "cifalsecolor")

    colorfilter?.setvalue(ciimage, forkey: "inputimage")
    colorfilter?.setvalue(cicolor(cgcolor: qrcodecolor.cgcolor), forkey: "inputcolor0")// 二维码颜色
    colorfilter?.setvalue(cicolor(cgcolor: qrcodebgcolor.cgcolor), forkey: "inputcolor1")// 背景色


    //4.生成处理

    let outimage = colorfilter!.outputimage
    let scale = qrcodesize / outimage!.extent.size.width;


    let transform = cgaffinetransform(scalex: scale, y: scale)

    let transformimage = colorfilter!.outputimage!.applying(transform)

通过cgimage生成uiimage

let image = uiimage(ciimage: ciimage)

绘制logo和边框

// 绘制logo
uigraphicsbeginimagecontextwithoptions(image.size, false, uiscreen.main.scale)
    image.draw(in: cgrect(x: 0, y: 0, width: image.size.width, height: image.size.height))

//线框
let logoborderlineimagae = qrcodelogo.getroundrectimage(size: logowidth, radius: radius, borderwidth: borderlinewidth, bordercolor: borderlinecolor)
//边框
let logoborderimagae = logoborderlineimagae.getroundrectimage(size: logowidth, radius: radius, borderwidth: boderwidth, bordercolor: bordercolor)

logoborderimagae.draw(in: logoframe)

let qrcodeimage = uigraphicsgetimagefromcurrentimagecontext()
uigraphicsendimagecontext()

封装接口:

 /**
   1.生成二维码

   - returns: 黑白普通二维码(大小为300)
   */

  func generateqrcode() -> uiimage


    /**
   2.生成二维码

   - parameter size: 大小

   - returns: 生成带大小参数的黑白普通二维码
   */
   func generateqrcodewithsize(size:cgfloat?) -> uiimage


     /**
   3.生成二维码

   - parameter logo: 图标

   - returns: 生成带logo二维码(大小:300)
   */
   func generateqrcodewithlogo(logo:uiimage?) -> uiimage


     /**
   4.生成二维码

   - parameter size: 大小
   - parameter logo: 图标

   - returns: 生成大小和logo的二维码
   */
  func generateqrcode(size:cgfloat?,logo:uiimage?) -> uiimage


    /**
   5.生成二维码

   - parameter size:  大小
   - parameter color:  颜色
   - parameter bgcolor: 背景颜色
   - parameter logo:  图标

   - returns: 带logo、颜色二维码
   */
  func generateqrcode(size:cgfloat?,color:uicolor?,bgcolor:uicolor?,logo:uiimage?) -> uiimage


    /**
   6.生成二维码

   - parameter size:      大小
   - parameter color:      颜色
   - parameter bgcolor:     背景颜色
   - parameter logo:      图标
   - parameter radius:     圆角
   - parameter borderlinewidth: 线宽
   - parameter borderlinecolor: 线颜色
   - parameter boderwidth:   带宽
   - parameter bordercolor:   带颜色

   - returns: 自定义二维码
   */
  func generateqrcode(size:cgfloat?,color:uicolor?,bgcolor:uicolor?,logo:uiimage?,radius:cgfloat,borderlinewidth:cgfloat?,borderlinecolor:uicolor?,boderwidth:cgfloat?,bordercolor:uicolor?) -> uiimage
使用

dispatchqueue.global().async {

let image = content.generateqrcodewithlogo(logo: self.logoimageview.image)
        dispatchqueue.main.async(execute: {
          self.qrcodeimageview.image = image
        })

      }

3.识别二维码

通过cidetector识别二维码

cidetector用于分析ciimage，以得到cifeature，每个cidetector都要用一个探测器类型（nsstring）来初始化。这个类型用于告诉探测器要找什么特征

1.识别图片二维码

  func recognizeqrcode() -> string?
  {

    let detector = cidetector(oftype: cidetectortypeqrcode, context: nil, options: [cidetectoraccuracy : cidetectoraccuracyhigh])
    let features = detector?.features(in: coreimage.ciimage(cgimage: self.cgimage!))
    guard (features?.count)! > 0 else { return nil }
    let feature = features?.first as? ciqrcodefeature
    return feature?.messagestring

  }

使用实例

dispatchqueue.global().async {
      let recognizeresult = self.sourceimage?.recognizeqrcode()
      let result = recognizeresult?.characters.count > 0 ? recognizeresult : "无法识别"
      dispatchqueue.main.async {
        tool.confirm(title: "扫描结果", message: result, controller: self)
        self.activityindicatoryview.stopanimating()
      }
    }

本文demo地址：qrcode_jb51.rar

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