Ios 如何在UITextview中通过单词包装NSTextAttachment进行换行

我使用UITextview并将NSTextAttachment作为图像插入其中。该文本视图只有附件图像，没有任何普通文本。如何像普通文本一样换行。我已设置textContainer的lineBreakMode属性，但不起作用。我将感谢你的任何帮助

 func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        return true
   
        for data in arrDataModel {
              if data.textDefaul == text {
                  let attachment = NSTextAttachment()
                  if let image = data.imageData {
                    
                      let imageNew = UIImage(data: image)!
                      attachment.image =  imageNew.colorImage(with: colorDefault)
                  }else{
                    return true
                  }
                let attString = NSAttributedString(attachment: attachment)
                var attributedString :NSMutableAttributedString!
                attributedString = NSMutableAttributedString(attributedString:textView.attributedText)

                attributedString.insert(attString, at: textView.selectedRange.location)
                textView.attributedText = attributedString
                textView.selectedRange.location += 1
                return false
              }
          }

    
        return true
      }