collection view cells fetch data - ios

Question

I am new to collection view. I want to retrieve data from CoreData for collection view cell. I know how to retrieve for table view cell but it failed when I use similar way to fetch for collection view. Here are my functions from CoreDataHelper and ViewController class
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
if identifier == "displayCellDetail" {
print("Task View cell tapped")
CollectionViewCoreDataHelper.retrieveTasks()
let indexPath = collectionView.indexPathsForSelectedItems!
let task = tasks[indexPath.row]
let TaskSettingViewController = segue.destination as! ViewController
TaskSettingViewController.task = task
} else if identifier == "addTask" {
print("+ button tapped")
}
}
}
static func retrieveTasks() -> [Tasks] {
let fetchRequest = NSFetchRequest<Tasks>(entityName: "Tasks")
do {
let results = try managedContext.fetch(fetchRequest)
return results
} catch let error as NSError {
print("Could not fetch \(error)")
}
return []
}

Answer 1

Try this :
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
if identifier == "displayCellDetail" {
print("Task View cell tapped")
CollectionViewCoreDataHelper.retrieveTasks()
let cell = sender as? YourCellName //Cell from which this segue is being performed
let indexPath = self.collectionView!.indexPathForCell(cell)
let task = self.tasks[indexPath.item] //Downcast to type of task
let objTaskSettingVC = segue.destination as! TaskSettingViewController
objTaskSettingVC.tasks = task
}
else if identifier == "addTask" {
print("+ button tapped")
}
}
}

Answer 2

For passing the data from one viewController to other is here
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
if identifier == "displayCellDetail" {
print("Task View cell tapped")
CollectionViewCoreDataHelper.retrieveTasks()
let cell = sender as UICollectionViewCell
let indexPath = self.collectionView!.indexPathForCell(cell)
let task = self.tasks[indexPath.row] as [ToDo]
let objTaskSettingVC = segue.destination as! TaskSettingViewController // ViewController in which you want to send the data
objTaskSettingVC.tasks = [task] //tasks is your variable which is having same type and defined in your TaskSettingViewController
}
else if identifier == "addTask" {
print("+ button tapped")
}
}
}