Swift CIDetector识别相册的二维码

 

import UIKit

 

class firstViewController: UIViewController,UIImagePickerControllerDelegate,UINavigationControllerDelegate {

 

    var picker :UIImagePickerController!

 

    @IBAction func button(_ sender: UIButton) {

        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary){

            picker = UIImagePickerController()

            picker.delegate = self

            picker.sourceType = .photoLibrary

            self.present(picker, animated: true, completion: nil)

        }

    }

 

 

    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {

        //获取选择的图片

        let image = info[UIImagePickerControllerOriginalImage] as! UIImage

 

        //二维码读取

        DispatchQueue.global().async {

　　　　　　　let ciImage:CIImage = CIImage(image: image)!

            let detector = CIDetector(ofType: CIDetectorTypeQRCode, context:nil,options:[CIDetectorAccuracy:CIDetectorAccuracyHigh])

            let feature = detector?.features(in: ciImage)

            let f = feature?.first as! CIQRCodeFeature

            print(f.messageString ?? "")

        }

 

        //返回

        picker.dismiss(animated: true, completion: {

            () -> Void in

        })

 

    }

}