Use of unresolved identifier 'cell' in xcode project - ios

Question

In my match app Xcode project I have an error stating:
Use of unresolved identifier 'cell'.
My Code:
import UIKit
class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
}
#IBOutlet weak var collectionView: UICollectionView!
var model = CardModel()
var cardArray:[Card] = []
override func viewDidLoad() {
super.viewDidLoad()
//call the getCards method of the card model
cardArray = model.getCards()
collectionView.delegate = self
collectionView.dataSource = self
}
//mark: -UICollectionView Protocol Methods
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return cardArray.count
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) {
//get a cardCollectionViewcell object
let cell =
collectionView.dequeueReusableCell(withReuseIdentifier: "CardCell", for: indexPath) as! CardCollectionViewCell
//get card that
let card = cardArray[indexPath.row]
cell.setCard(card)
return
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
_ = collectionView.cellForItem(at: indexPath) as!CardCollectionViewCell
//flip the card
cell.flip() <--------- THIS IS THE ERROR
Once the error is fixed I am supposed to be able run a match app example on the fake iPhone. It would allow me to flip the cards on a click.

Answer 1

I think you forgot to set reusable identifier
I hope this will be resolve your issue.
To access that cell method you have to declare variable
let cell = collectionView.cellForItem(at: indexPath) as!CardCollectionViewCell

Answer 2

First of all you are misusing collectionView:willDisplay:forItemAt. Move everything into collectionView:cellForItemAt, replace return with return cell and delete willDisplay:
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CardCell", for: indexPath) as! CardCollectionViewCell
//get card that
let card = cardArray[indexPath.row]
cell.setCard(card)
return cell
}
func collectionView(_ collectionView: UICollectionView, willDisplay cell: UICollectionViewCell, forItemAt indexPath: IndexPath) { ... }
The error is pretty clear: You never declared cell is the scope of didSelectItemAt. Change
let cell = collectionView.cellForItem(at: indexPath) as! CardCollectionViewCell