“无法识别的选择器发送到实例” swift

Question

I keep getting a “Unrecognized selector sent to instance” in the addButtonDidTouch function when ever I press the button. I have no idea what I might be doing wrong.

@IBAction func addButtonDidTouch(_ sender: AnyObject) {
    let alert = UIAlertController(title: "Grocery Item",
                                  message: "Add an item to the list",
                                  preferredStyle: .alert)

    let saveAction = UIAlertAction(title: "Save",
                                   style: .default) { action in
       guard let textField = alert.textFields?.first,
        let text = textField.text else { return }

        let listItem = ListItem(name: text, addedByUser: self.user.email, completed: false)

        let listItemRef = self.ref.child(text.lowercased())

        listItemRef.setValue(listItem.toAnyObject())
    }

the whole error im getting is

[UITableViewController addButtonDidTouch:]: unrecognized selector sent to instance 0x7fba30612ce0

Answer 1

In your storyboard you have not set the class of this UITableViewController subclass. In IB, select the view controller, then visit the third tab over in the inspector. You need to set the Class to be your class.

I can tell because the error refers to UITableViewController not your custom subclass.