delegate returns nil tvOS - ios

Question

I am trying to figure out from long time. Can someone tell me why my delegate method is never called. Its a tvOS project but i believe it should work as simple iOS app. On click of button i have a popup table view and on select i am trying to update button label with selected option.
protocol PopupSelectionHandlerProtocol{
func UpdateSelected(data:String)
}
class PopupViewController: UIViewController, UITableViewDataSource,UITableViewDelegate {
#IBOutlet weak var myTable: UITableView!
let months = [1,2,3,4,5,6,7,8,9,10,11,12]
let days = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31]
let yearsRange = [2015,2016,2017,2018,2019,2020]
var popupType:String!
var delegate:PopupSelectionHandlerProtocol?
override func viewDidLoad() {
super.viewDidLoad()
popupType = "months"
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if (popupType == "months"){
return 12
}else if (popupType == "days"){
return 31
}else if (popupType == "years")
{
return 6
}
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
cell.textLabel?.text = String(months[indexPath.row])
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print(tableView.cellForRowAtIndexPath(indexPath)?.textLabel?.text)
delegate?.UpdateSelected((tableView.cellForRowAtIndexPath(indexPath)?.textLabel?.text)!)
self.dismissViewControllerAnimated(true, completion: nil)
}
}
And then This -
class VacationPlannerController: UIViewController,PopupSelectionHandlerProtocol {
#IBOutlet weak var fromMonth: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
let popupDelegate = PopupViewController()
popupDelegate.delegate = self
}
func UpdateSelected(data:String){
print("Inside UpdateSelected VacationPlannerController \(data)")
fromMonth.titleLabel?.text = data
}
}

Answer 1

The problem is that, you are getting your delegate as nil, since there can be only one ViewController at a time presented. Since your popupViewController's view is not loaded. The viewDidLoad() method is not getting called, resulting in non-setting of popupDelegate.
If you want to check its nullity. Try this in your didSelect... Method
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.navigationController?.pushViewController(VacationPlannerController(), animated: true)
if(delegate==nil){
print("delegate is nil")
}
delegate?.UpdateSelected((tableView.cellForRowAtIndexPath(indexPath)?.textLabel?.text)!)
}
If you want the fromMonth button to be updated. First you will need to present/push VacationPlannerController in order to call its viewDidLoad(). Then only you will be able to update its property, that is, fromMonth label.

Answer 2

Two things to resolve this issue -
First in PopupViewController-
In didSelectRowAtIndexPath, replaced
delegate?.UpdateSelected((tableView.cellForRowAtIndexPath(indexPath)?.textLabel?.text)!)
with
self.delegate?.UpdateSelected((tableView.cellForRowAtIndexPath(indexPath)?.textLabel?.text)!)
And Second in VacationPlannerController-
Removed below code from viewDidLoad -
let popupDelegate = PopupViewController()
popupDelegate.delegate = self
And added prepareForSegue -
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let destinationVC = segue.destinationViewController as! PopupViewController
destinationVC.delegate = self
}
And issue resolved yeeee :)