swift-生成二维码（可带图片）

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        // 不带图片的二维码图片

        let imageViewIcon1 = UIImageView(frame: CGRect(x: 20, y: 20, width: 150, height: 150))

        imageViewIcon1.image = createQRForString("MR.G", qrImageName: "")

        self.view.addSubview(imageViewIcon1)

        

        // 带图片的二维码图片

        let imageViewIcon2 = UIImageView(frame: CGRect(x: 200, y: <