swift protocol delegate always return nil - ios

Question

I have this protocol delegate defined in my View Controller:
protocol PickerDelegate : NSObjectProtocol {
func updateMessage(meesage: String)
}
and then I called this in my View Controller:
class GradingController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, SDataGridDataSourceHelperDelegate, SLAIssuedFinalGradingDelegate, CityApprovalIssuedDelegate, CityCommentReceivedDelegate, DepositReceivedDelegate, UIPopoverPresentationControllerDelegate {
var pickerDelegate: PickerDelegate?
}
And then I am calling my method inside the protocol delegate (this is where its nil):
func popoverPresentationControllerDidDismissPopover(_ popoverPresentationController: UIPopoverPresentationController) {
let controller = popoverPresentationController.presentedViewController as! CommentsController
pickerDelegate?.updateMessage(meesage: controller.commentView.text)
}
And I am using this delegate in my custom class:
class TextCell: SDataGridCell, PickerDelegate {
var dataGrid: ShinobiDataGrid?
private var _commentText = ""
private var label: UILabel?
var commentText: String {
get {
return _commentText
}
set(commentText) {
if(commentText != "")
{
label?.text = commentText
}
else
{
label?.text = "N/A"
}
}
}
override init(reuseIdentifier identifier: String!) {
super.init(reuseIdentifier: identifier)
label = UILabel()
label?.font = UIFont.systemFont(ofSize: 15)
label?.frame = CGRect(x: 0, y: 0, width: 200, height: 32)
addSubview(label!)
let pickerViewController = GradingController()
pickerViewController.pickerDelegate = self
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override init(frame: CGRect) {
super.init(frame: frame)
}
override func respondToEditEvent() {
if dataGrid?.delegate.responds(to: #selector(SDataGridDelegate.shinobiDataGrid(_:shouldBeginEditingCellAtCoordinate:))) ?? false {
if dataGrid?.delegate.shinobiDataGrid!(dataGrid, shouldBeginEditingCellAtCoordinate: coordinate) == false {
return
}
}
if dataGrid?.delegate.responds(to: #selector(SDataGridDelegate.shinobiDataGrid(_:willBeginEditingCellAtCoordinate:))) ?? false {
dataGrid?.delegate.shinobiDataGrid!(dataGrid, willBeginEditingCellAtCoordinate: coordinate)
}
}
func updateMessage(meesage: String) {
commentText = meesage
}
}
But the updateMessage method is not being called, my delegate is nil in my View Controller when I try to use it in popoverPresentationControllerDidDismissPopover but it always return nil :(
What am I doing wrong?
This is the TextCell in GradingController:
func dataGridDataSourceHelper(_ helper: SDataGridDataSourceHelper!, populateCell cell: SDataGridCell!, withValue value: Any!, forProperty propertyKey: String!, sourceObject object: Any!) -> Bool {
let cellDataObj = object as? GradingData
if(propertyKey == "GradingRepair")
{
let textCell = cell as? TextCell
textCell?.dataGrid = self.grid
textCell?.commentText = (cellDataObj?.GradingRepair)!
return true
}
return false
}

Answer 1

Consider what this code does:
let pickerViewController = GradingController() // 1
pickerViewController.pickerDelegate = self // 2
// 3
You create a completely new GradingController.
You assign the GradingController a pickerDelegate.
Nothing. So you throw the GradingController away. Your code thus has no effect on anything.
What you need to do is to assign a pickerDelegate to the actual GradingController that's in your interface. But that's not what you did.