如何在ios应用程序中看到键盘，以swogramatic方式检查swift

In my app, I have a table view with text labels inside. When a user presses on one of the text labels, the keyboard is shown, but each time the table is reloading, the keyboard disappears. I want to add a check (when the table is reloading) to see if the keyboard is up, and if so , then to make it visible again after reloading is finished. My question is - how can I check if the keyboard is visible? any help will be appreciated. thanksIn my app, I have a table view with text labels