@IBAction func onclickBtnScan(_ btn : UIButton!) {
        let vcQRCode = SYQRCodeReader()
        vcQRCode.setReaderDelegate(self)
        self.present(vcQRCode, animated: true, completion: nil)
    }

    @IBAction func onClickBtnGenerate(_ btn : UIButton!) {
        let imageQRCode = generateQRCodeImage("sunyang", strLogo: "qrcodelogo")
        self.logo.image = imageQRCode
    }

    @IBAction func onClickBtnRead(_ btn : UIButton!) {
        if UIImagePickerController.isSourceTypeAvailable(.photoLibrary) {
            let imagePicker = UIImagePickerController()
            imagePicker.delegate = self
            imagePicker.sourceType = .photoLibrary
            self.present(imagePicker, animated: true, completion: nil)
        }
    }

    //代理
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        let imagePicked = info[UIImagePickerControllerOriginalImage] as! UIImage

        //展示读取到的图片信息
        alertInfo(readQRCodeImage(imagePicked), msg: nil)

        picker.dismiss(animated: true, completion: nil)
    }

    //reader delegate
    func reader(reader: SYQRCodeReader!, didReadModel: SYQRCodeModel!, success: Bool) {
        self.mQRCode = didReadModel
        SYLog(self.mQRCode.describe(), classname: self)
        reader?.dismiss(animated: true, completion: { () -> Void in
            alertInfo(nil, msg: self.mQRCode.describe())
        })
    }

    func readerDidReadFail(reader: SYQRCodeReader!) {
        SYLog("readFailBlock", classname: self)
    }