二維碼---相冊識別 swift

swift 3.0 xcode 8.1

須要在info.plist 添加 Privacy - Photo Library Usage Description YES

import UIKit

class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let button = UIButton.init(type: UIButtonType.custom)
        button.frame = CGRect.init(x: 20, y: 300, width: 300, height: 40)
        button.setTitle("點擊獲取相冊二維碼圖片信息", for: UIControlState.normal)
        button.setTitleColor(UIColor.black, for: UIControlState.normal)
        button.addTarget(self, action: #selector(self.getImage), for: UIControlEvents.touchUpInside)
        self.view.addSubview(button)
 
    }
    
    
    func getImage() {
        
        let imagePickCST = UIImagePickerControllerSourceType.photoLibrary
        let imagePickC = UIImagePickerController.init()
        imagePickC.sourceType = imagePickCST
        imagePickC.delegate = self
        self.present(imagePickC, animated: true, completion: nil)
        
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        
        picker.dismiss(animated: true, completion: nil)
        
        //獲取到的原始圖片
        let image = info[UIImagePickerControllerOriginalImage]
        
        let imageData = UIImagePNGRepresentation(image as! UIImage)
        let ciImage = CIImage(data: imageData!)
        
        //初始化一個檢測器
        let detector = CIDetector(ofType: CIDetectorTypeQRCode, context: nil, options: [CIDetectorAccuracy:CIDetectorAccuracyLow])
        
        //檢測到的結果數組
        let array = detector?.features(in: ciImage!)
        
        //取出數組中的第一個結果
        if (array?.count)! > 0 {
            let result: CIQRCodeFeature = array!.first as! CIQRCodeFeature
            print(result.messageString!)
        }
        
    }
    
    

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}