title: set delegate for textfields on UITableViewcell
body: <p>I use "tags" for identifying textfields inside a UITableView in my swift code. I need to implement UITextFieldDelegate functions like textfieldshouldreturn and textFieldShouldBeginEditing. But in most examples, these delegate functions shows textfields on UIView, but  not inside a UITableView. Where should I set the delegate for the textfields and how can be? (I know that for a static textfield under a UIView, we set delegate under the functions like ViewDidiLoad or similar life cycle methods.)</p>