How to add gesture to UITableViewCell?

Question

I want to add a tap gesture to every cell in a UITableView that edits the content in it. The two ways to add a gesture are in code or through storyboard. I tried bo

Answer 1

The easiest way to do this is to add the gesture in a custom UITableViewCell. An easier alternative to setting up a custom delegate pattern is to inform the view controller of the edits would be to use a handler in the form of a closure that the view controller can provide and which is called when user editing is finished. I'm assuming a textField is used to allow cell editing.

class CustomTableViewCell: UITableViewCell {

    func activateTitleEditing() {
        textField.isEnabled = true
        textField.becomeFirstResponder()
    }

    // This will hold the handler closure which the view controller provides
    var resignationHandler: (() -> Void)?

    @objc private func tap(_ recognizer: UITapGestureRecognizer) {
        guard recognizer.state == .ended else { return }
        activateTitleEditing()
    }

    @IBOutlet weak var textField: UITextField! { didSet {
        textField.delegate = self
        let tap = UITapGestureRecognizer(target: self, action: #selector(tap(_:)))
        addGestureRecognizer(tap)
        textField.isEnabled = false
        }}
}

extension CustomTableViewCell: UITextFieldDelegate {
    func textFieldDidEndEditing(_ textField: UITextField) {
        resignationHandler?()
    }
}

And within your custom UITableViewController, pass in the handler to be able to make changes to your model. Don't forget to account for possible memory cycles in the closure.

override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    // initialize and return table view cell
    let cell = tableView.dequeueReusableCell(withIdentifier: K.documentCellIdentifier, for: indexPath)
    assert(cell is CustomTableViewCell, "Document cell dequeuing error")
    let customCell = cell as! DocumentTableViewCell
    customCell.textField.text = documentModel.documents[indexPath.row]
    customCell.resignationHandler = { [weak self, unowned customCell] in
        guard let self = self else { return }
        if let newTitle = customCell.textField.text {
            self.cellModel.cells[indexPath.row] = newTitle
        }
    }
    return customCell
}