Send data from CustomTableView Class to its parent View Controller - swift

Question

I have a View Controller "VCInicio", that has a TableView in his View, the Cells for that TableView are in a .xib format, the cells has a custom class called "CustomiseTableViewCell", inside there I have logic that gets and print a String (Phone Number) every time I click on a RadioButton, it prints its Phone Number, I'm able to print the value (From CustomiseTableViewCell Class) and see the value on console, but I need to send that value back to "VCInicio" so I can manipulate it from that Controller. I've seen lots of examples that suggest to use Protocols but I haven't been able to make them work.
EDIT: Because of the structure I'm using, I can't work with didSelectRowAt, hence I'm working with the Selection of the Radio Button instead of the selection of the cell.
What Fixed the Issue:
"CustomiseTableViewCellDelegate" TableView Custom Class (Child Class)
//Protocol Implementation
protocol CustomiseTableViewCellDelegate {
func onPhoneNumberClicked(_ cell: CustomiseTableViewCell, phoneNumber: String?)
}
class CustomiseTableViewCell: UITableViewCell {
var delegate: CustomiseTableViewCellDelegate?
var phone: String?
override func awakeFromNib() {
super.awakeFromNib()
...
}
//Here I get and send the phoneNumber
#objc func radioButtonTapped(_ radioButton: UIButton) {
...
phone = itemLabel.text!
self.delegate?.onPhoneNumberClicked(self, phoneNumber: phone!)
...
}
}
"VCInicio" View Controller
class VCInicio: UIViewController, UITableViewDelegate, UITableViewDataSource, CustomiseTableViewCellDelegate {
func onPhoneNumberClicked(_ cell: CustomiseTableViewCell, phoneNumber: String?) {
//Here I print the phoneNumber
print("From VCInicio", phoneNumber)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCell(withIdentifier: "phoneCell", for: indexPath) as! CustomiseTableViewCell
cell.delegate = self
...
//cell data config
...
return cell
}
}

Answer 1

If you don't want to use custom protocols:
Assuming you have the numbers stored in some model in variable phoneNumbers: [String]
Make your VC table view delegate:
self.tableView.delegate = self
Extend ViewController to conform UITableViewDelegate protocol
class VCInicio: UIViewController, UITableViewDelegate {
//...
}
Implement func tableView(UITableView, didSelectRowAt: IndexPath) and use selected cell phone value to manipulate it later
class VCInicio: UIViewController, UITableViewDelegate {
//...
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let selectedPhoneNumber = self.model.phoneNumbers[indexPath.row]
// manipulate selectedPhoneNumber
}
}
With protocols:
Define cell delegate and use it in the method for click
protocol CustomiseTableViewCellDelegate: class {
func onPhoneNumberClicked(_ cell: CustomiseTableViewCell, phoneNumber: String?)
}
class CustomiseTableViewCell: UITableViewCell {
weak var delegate: CustomiseTableViewCellDelegate?
// ... rest of your cell class
func onPhoneClicked() {
// this is the function where you have code to print the number to console
print(self.phoneNumberLabel.text)
self.delegate?.onPhoneNumberClicked(self, self.phoneNumberLabel.text)
}
}
In your UITableViewDataSource method for creating cells make VCInicio as cell's delegate
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// assuming you have your cell here
cell.delegate = self
return cell
}
Make your VC conform to CustomiseTableViewCellDelegate protocol
class VCInicio: UIViewController, CustomiseTableViewCellDelegate {
//...
override func onPhoneNumberClicked(_ cell: CustomiseTableViewCell, phoneNumber: String?) {
// manipulate phoneNumber
}
}

Answer 2

This code below is right now for an ImageView with a gesture recognizer. Which is targeted to the handleAvatarTap. Which is posting a global notification. Any ViewController or View can listen to notifications, and once the chosen one is posted the controller can act on this.
In the example below is an example, passing the ImageView as an object for the notification.
// this is how I am creating a new notification name type
extension Notification.Name {
static let didTapAvatar = Notification.Name("didTapAvatar")
}
// this would go within the cell where you are printing the number
#objc func handleAvatarTap() {
NotificationCenter.default.post(name: .didTapAvatar, object: self)
}
// This would go in to the view controller viewDidLoad
NotificationCenter.default.addObserver(self, selector: #selector(handleAvatarTap), name: .didTapAvatar, object: nil)
// This is the objc func within the view controller
#objc fileprivate func handleAvatarTap(notification: NSNotification) {
// checking the type of the posted notification object
guard let avatarView = notification.object as? AvatarView else { return }
}