图像未在UITextView中显示

Question

我正在尝试从我的TextView内的文本内联显示库中的选定图像。我从这里得到这个代码，程序运行没有错误。但是，所选图片不会显示在TextView中。任何帮助将不胜感激，提前谢谢。

这是我到目前为止所得到的：

// MARK：相机按钮

 @IBAction func camera(_ sender: Any) {

        let pickerController = UIImagePickerController()
        pickerController.delegate = self as? UIImagePickerControllerDelegate & UINavigationControllerDelegate
        pickerController.sourceType = UIImagePickerControllerSourceType.photoLibrary
        pickerController.allowsEditing = true

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

    }

    // MARK: show selected inmage in textview
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: AnyObject]) {

        // get image from libary
        if let libraryImage = info[UIImagePickerControllerOriginalImage] as? UIImage {

            var attributedString :NSMutableAttributedString!
            attributedString = NSMutableAttributedString(attributedString:notesTextView.attributedText)
            let textAttachment = NSTextAttachment()
            textAttachment.image = libraryImage

            //textView
            let oldWidth = textAttachment.image!.size.width;
            let scaleFactor = oldWidth / (notesTextView.frame.size.width - 10);
            textAttachment.image = UIImage(cgImage: textAttachment.image!.cgImage!, scale: scaleFactor, orientation: .up)
            let attrStringWithImage = NSAttributedString(attachment: textAttachment)
            attributedString.append(attrStringWithImage)
            notesTextView.attributedText = attributedString;

        }

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