How to connect custom collectionviewCell to reuseidentifier with XIB - Swift - ios

Question

I am making a custom collectionview cell Using XIB.
The collectionview is placed inside an viewController as an extension.
This is the code i am using to call the Xib View but i get an error telling me i need to use reuseidentifier. But i have no clue how to use that while using XIB.
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = Bundle.main.loadNibNamed("CustomCell", owner: self, options: nil)?.first as! CustomCell
return cell
}
Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'the cell returned from -collectionView:cellForItemAtIndexPath: does not have a reuseIdentifier - cells must be retrieved by calling -dequeueReusableCellWithReuseIdentifier:forIndexPath:'
*** First throw call stack:

Answer 1

First you need to create a reuseIdentifier for your cell. Lets create it based on your collectionViewCell class name. Declare reuseId, in your ViewController file:
let reuseId = String(describing: CustomCell.self)
You need to register your cell to your collectionView in viewDidLoad method.
collectionView.register(CustomCell.self, forCellReuseIdentifier: reuseId)
Then in your cellForItemAt method:
guard let cell = collectionView.dequeueReusableCell(withIdentifier: reuseId, for: indexPath) as? CustomCell else { return UICollectionViewCell() }
//return cell, or update cell elements first.

Answer 2

You can register the CustomCell like,
let customCellNib = UINib(nibName: "CustomCell", bundle: .main)
collectionView.register(customCellNib, forCellWithReuseIdentifier: "CustomCell")
And use the same registered cell in cellForItemAt like,
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
guard let cell = collectionView.dequeueReusableCell(withReuseIdentifier:"CustomCell", for: indexPath) as? CustomCell else {
return UICollectionViewCell()
}
return cell
}

Answer 3

For Swift 4.0 and 4.2
In your viewDidLoad:
custom collectionViewCell
mainCollectionView.register(UINib(nibName: "your_custom_cell_name", bundle: nil), forCellWithReuseIdentifier: "your_custom_cell_identifier")
In cellForItemAt indexPath:
let cell : <your_custom_cell_name> = mainCollectionView.dequeueReusableCell(withReuseIdentifier: "your_custom_cell_identifier", for: indexPath) as! <your_custom_cell_name>
And don't forget to set identifier for your custom cell in xib section.