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
Declare that your class conforms to the UITextFieldDelegate
protocol and implement any of those protocol methods that you need.
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UITextFieldDelegate { ... }
I had the same problem, but it was because of a different issue:
class CustomViewController: UIViewController {
let customerCardTableView: UITableView = {
let table = UITableView()
table.translatesAutoresizingMaskIntoConstraints = false
table.backgroundColor = UIColor(patternImage: UIImage(named: "background")!)
table.delegate = self
table.dataSource = self
table.separatorStyle = .none
table.separatorColor = UIColor(rgb:0xFFFFFF)
table.separatorInset = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)
return table
}()
...other code
}
and I did extend my CustomViewController
to conform to the UITableViewDelegate
, UITableViewDataSource
protocols.
The reason was that self
isn't accessible if you're using let
. I had to lazy var customerCardTableView: UITableView
i.e.:
lazy var customerCardTableView: UITableView = {
let table = UITableView()
table.translatesAutoresizingMaskIntoConstraints = false
table.backgroundColor = UIColor(patternImage: UIImage(named: "background")!)
table.delegate = self
table.dataSource = self
table.separatorStyle = .none
table.separatorColor = UIColor(rgb:0xFFFFFF)
table.separatorInset = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)
return table
}()
let
s are required to happen during instantiation, but lazy var
s can be delayed to a time after instantiation, hence they can access self
...
Embarrassing to own up to it, but worth a mention. Make sure that you're extending the correct view controller when declaring conformance. For example, don't do this by accident.
class ViewController: UIViewController {
}
extension SimilarlyNamedViewController: UITableViewDelegate {
}
It's an easy one to do if you use autocomplete and gets by you because, at a glance, it looks the same.
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