The line self.MessageTextField.delegate = self
causes the error since you try to assign self
as the delegate
of a UITextField
.
But your ViewController
is not a UITextFieldDelegate
. To make your class this kind of delegte, you need to adopt the UITextFieldDelegate
protocol. This can be achieved by adding it to the list of protocols and classes your class inherits from / conforms to. In your case that is done by changing the line
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource
to
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate