swift二维码生成,扫描

背景

二维码在现在的应用中用的越来越多,iOS的三方框架用的多就是ZBar 和 ZXing了,但是对于项目需求不是很迫切，还是建议自己写简单的类库或方法,毕竟用第三方的东西有时候有坑是很难填的。

技术实现

• 二维码生成

  • @param formdata 需要生成二维码的数据
  • @param imageWidth 图片的宽度
  • @param logo 二维码中心logo(为nil时无logo)

使用方法： qrImg.image = FlQRCodeTool.generateWithDefaultQRCode(formdata: "www.baidu.com", imageWidth: 100, logo: UIImage.init(named: "yaoming"))

效果图：

带有logo的二维码.png

代码实现:

        //创建一个二维码的滤镜
        let qrFilter = CIFilter(name: "CIQRCodeGenerator")
        
        // 恢复滤镜的默认属性
        qrFilter?.setDefaults()
        
        // 将字符串转换成
        let infoData =  formdata.data(using: .utf8)
        
        // 通过KVC设置滤镜inputMessage数据
        qrFilter?.setValue(infoData, forKey: "inputMessage")
        
        // 获得滤镜输出的图像
        let  outputImage = qrFilter?.outputImage
        
        // 设置缩放比例
        let scale = imageWidth / outputImage!.extent.size.width;
        let transform = CGAffineTransform(scaleX: scale, y: scale)
        let transformImage = qrFilter!.outputImage!.applying(transform)
        
        // 获取Image
        let image = UIImage(ciImage: transformImage)

        // 无logo时  返回普通二维码image
        guard let QRCodeLogo = logo else { return image }
        
        // logo尺寸与frame
        let logoWidth = image.size.width/4
        let logoFrame = CGRect(x: (image.size.width - logoWidth) /  2, y: (image.size.width - logoWidth) / 2, width: logoWidth, height: logoWidth)
        
        // 绘制二维码
        UIGraphicsBeginImageContextWithOptions(image.size, false, UIScreen.main.scale)
        image.draw(in: CGRect(x: 0, y: 0, width: image.size.width, height: image.size.height))
        
        // 绘制中间logo
        QRCodeLogo.draw(in: logoFrame)
        
        //返回带有logo的二维码
        let QRCodeImage = UIGraphicsGetImageFromCurrentImageContext()
        UIGraphicsEndImageContext()
        return QRCodeImage!

• 二维码扫描

使用方法,主要有三个：
1.第一设置扫描session: func setupScanSession()
2.扫描中上下移动的横线动画: func scanAnimation() -> CABasicAnimation
3.代理方法,获取扫描结果: func captureOutput(_ captureOutput: AVCaptureOutput!, didOutputMetadataObjects metadataObjects: [Any]!, from connection: AVCaptureConnection!)

效果图:

WechatIMG3.jpeg

1.方法一实现:

            //设置捕捉设备
            let device = AVCaptureDevice.defaultDevice(withMediaType: AVMediaTypeVideo)
            //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)
            
            //设置扫描区域
            NotificationCenter.default.addObserver(forName: NSNotification.Name.AVCaptureInputPortFormatDescriptionDidChange, object: nil, queue: nil, using: { (noti) in
                output.rectOfInterest = (scanPreviewLayer?.metadataOutputRectOfInterest(for: self.scanPan.frame))!
            })
            //保存会话
            self.scanSession = scanSession
            

方法二实现:

       //让横线在扫描的区域内上下移动
        let startPoint = CGPoint(x: scanLine .center.x  , y: 1)
        let endPoint = CGPoint(x: scanLine.center.x, y: scanPan.bounds.size.height - 2)
        let translation = CABasicAnimation(keyPath: "position")
        translation.timingFunction = CAMediaTimingFunction(name: kCAMediaTimingFunctionEaseInEaseOut)
        translation.fromValue = NSValue(cgPoint: startPoint)
        translation.toValue = NSValue(cgPoint: endPoint)
        translation.duration = 4.0
        translation.repeatCount = MAXFLOAT
        translation.autoreverses = true

方法三实现:

    // 扫描完成代理方法
    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
        guard let soundPath = Bundle.main.path(forResource: "noticeMusic.caf", ofType: nil)  else { return }
        guard let soundUrl = NSURL(string: soundPath) else { return }
        var soundID:SystemSoundID = 0
        AudioServicesCreateSystemSoundID(soundUrl, &soundID)
        AudioServicesPlaySystemSound(soundID)
        
        //扫完完成
        if metadataObjects.count > 0
        {
            if let resultObj = metadataObjects.first as? AVMetadataMachineReadableCodeObject
            {
              // 展示扫描的结果或者其他处理
            }
        }
        
    }

代码下载地址：https://github.com/sufangliang/SFLQRCode