             ) {
             self.present(ShowController(image: tryImage), animated: true, completion: nil)
         } else {
-            let alert = UIAlertController(title: "Warning", message: "Create QRCode failed!", preferredStyle: .alert)
+            let alert = UIAlertController(title: "Warning", message: "Create QRCode failed!", preferredStyle: .actionSheet)
             alert.addAction(UIAlertAction(title: "OK", style: .cancel, handler: nil))
             self.present(alert, animated: true, completion: nil)
         }

        let alert = UIAlertController(
            title: "Size",
            message: nil,
            preferredStyle: .alert
        )
        alert.addAction(
            UIAlertAction(title: "Cancel", style: .cancel, handler: {

        let alert = UIAlertController(
            title: "FrontColor",
            message: nil,
            preferredStyle: .actionSheet
        )
        alert.addAction(
            UIAlertAction(title: "Cancel", style: .cancel, handler: {
