how to use custom cell in collection view controller in swift 3 - ios

Question

I am using swift 3 - I know how to show some Images in collection view with custom Cell - the problem is that I can't use custom cell in Collection View Controller
here is the collection view Controller Codes
private let reuseIdentifier = "uploadCell"
class uploadedFiles: UICollectionViewController {
var images = ["1.jpg" , "2.jpg" , "3.jpg" , "4.jpg" ]
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: reuseIdentifier, for: indexPath)
//myCollectionView.sizeToFit()
//cell.sizeToFit()
cell.cellImages.image = UIImage(named: images[indexPath.row])
return cell
}
and here is the Collection view Cell Code
import UIKit
class UICollectionViewCell: UICollectionViewCell {
#IBOutlet weak var cellImages: UIImageView!
}
remember that I used "uploadCell" for identifier

Answer 1

For using CollectionView Custom Cell
Step 1: Create Subclass of CollectionViewCell
class ImageCell: UICollectionViewCell {
#IBOutlet weak var imgView: UIImageView!
}
Step 2: set CollectionViewCell class in StoryBoard
Step 3: reuseCollectionView Cell
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ImageCell", for: indexPath) as! ImageCell
cell.imgView.image = self.arrMedia[indexPath.row] as? UIImage
return cell
}

Answer 2

UICollectionView implementation is quite interesting. You can quite simple source code and video tutorial from these link :
https://github.com/Ady901/Demo02CollectionView.git
https://www.youtube.com/watch?v=5SrgvZF67Yw
class DummyCollectionCell: UICollectionViewCell {
#IBOutlet weak var userImageView: UIImageView!
#IBOutlet weak var titleLabel: UILabel!
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "DummyCollectionCell", for: indexPath) as! DummyCollectionCell
cell.titleLabel.text = nameArr[indexPath.row]
cell.userImageView.backgroundColor = .blue
return cell
}