swift手撕二维码一、简介二、二维码综合案例

let filter = CIFilter(name:"CIQRCodeGenerator")

let data = "456".data(using:String.Encoding.utf8)
filter?.setValue(data, forKey: "inputMessage")

if let image = filter?.outputImage {
            let resultImage = UIImage(ciImage: image)
            print(resultImage.size)
            //显示结果
            qrCoderImageView.image = resultImage
        }

if var  image = filter?.outputImage {
            let transform = CGAffineTransform(scaleX: 20, y: 20)
            image = image.transformed(by: transform)
            let resultImage = UIImage(ciImage: image)
            print(resultImage.size)
            //显示结果
            qrCoderImageView.image = resultImage
        }

        filter?.setValue("M", forKey: "inputCorrectionLevel")

 func getNewImage(sourceImage:UIImage,center:UIImage) -> UIImage {
 }

let size = sourceImage.size
  //开启图形上下文
UIGraphicsBeginImageContext(size)

  sourceImage.draw(in: CGRect(x: 0, y: 0, width: size.width, height: size.height))

  //绘制小图片
        let width:CGFloat = 80
        let height:CGFloat = 80
        let x :CGFloat = (size.width-width)*0.5
        let y:CGFloat = (size.height-height)*0.5
        
        center.draw(in: CGRect(x: x, y: y, width: width, height: height))

 //取出结果图片
   let resultImage = UIGraphicsGetImageFromCurrentImageContext()
   //关闭上下文
   UIGraphicsEndImageContext()
   //返回图片
   return resultImage!

 let center = UIImage(named: "img_1.jpg")
  resultImage = getNewImage(sourceImage: resultImage, center: center!)

        view.endEditing(true)

 @IBOutlet weak var souceImageView: UIImageView!
    
    @IBAction func detectorQRCode(_ sender: Any) {
        // 1、获取需要识别的图片
        let image = souceImageView.image
        }

 //2.1创建一个二维码探测器
        let dector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyHigh])

 let ciImage = CIImage(image: image!)
let features = dector?.features(in: ciImage!)
        for feature in features! {
            let qrFeature = feature as!CIQRCodeFeature
            print(qrFeature.messageString as Any)
        }

 @IBOutlet weak var toButtom: NSLayoutConstraint!

extension ScanQRCode {
    func startScanAnimation() -> () {
        toButtom.constant = scanBgView.frame.size.height
        //重新布局
        view.layoutIfNeeded()
        //修改
        toButtom.constant = -scanBgView.frame.size.height
        //添加动画
        UIView.animate(withDuration: 1) {
            UIView.setAnimationRepeatCount(MAXFLOAT)
            self.view.layoutIfNeeded()
        } 
    }

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        startScanAnimation()
    }

import AVFoundation

 func startScan() -> () {}

 let device = AVCaptureDevice.default(for: AVMediaType.video)

var input:AVCaptureDeviceInput?
        do {
            input = try AVCaptureDeviceInput(device: device!)
        } catch {
            print(error)
            return
        }

   let output = AVCaptureMetadataOutput()

        output.setMetadataObjectsDelegate(self, queue: DispatchQueue.main)

 //扫描到结果之后调用
extension ScanQRCode:AVCaptureMetadataOutputObjectsDelegate{
    func metadataOutput(_ output: AVCaptureMetadataOutput, didOutput metadataObjects: [AVMetadataObject], from connection: AVCaptureConnection) {
        print("test")
    }
}

var session:AVCaptureSession?

session = AVCaptureSession()
        //并非所有的设备都能被添加进来，所以要做判断
        if session!.canAddInput(input!)&&session!.canAddOutput(output){
            session!.addInput(input!)
            session!.addOutput(output)
        }else{
            return
        }

output.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]

        let layer = AVCaptureVideoPreviewLayer(session:session!)
        layer.frame = view.layer.bounds
        view.layer.addSublayer(layer)

 // 这样是没有二维码的边框的,所以插入边框
  view.layer.insertSublayer(layer, at: 0)

   session!.startRunning()

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        startScan() 
    }