iosswift3.0实现二维码扫描、生成、识别示例代码
基于swift3.0
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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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本文标题:iosswift3.0实现二维码扫描、生成、识别示例代码
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