How to open the keyboard immediately after switching to a specific ViewController?

Question

iOS

Good day.
A TextField is set on a certain ViewController. I would like the keyboard to open when switching to this ViewController.
Most likely, you just need to set the cursor, then the keyboard will open. But how to set the cursor?
And, if possible, show me where to read about changing the keyboard (for example, how to add a blue "Done" button, like in Instagram).
Thank you.

Answer 1

myTextField.returnKeyType = UIReturnKeyDone;
[myTextField becomeFirstResponder];