iOS (Swift): UICollectionView for a given UICollectionViewCell

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I have a UICollectionViewCell subclass that is contained within a UICollectionView as follows:

class MyCell: UICollectionViewCell {
}

class MyViewController: UIViewController, UICollectionViewDataSource {

    @IBOutlet public var collectionView: UICollectionView!

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        guard let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as? MyCell else { fatalError("Unexpected indexPath") }
        return cell
    }

}

Is there any way to access the collectionView instance defined in MyViewController from within MyCell?

Thanks for any help.

Try something like below

protocol MyCellDelegate {
    func reloadData()
}
class MyCell: UICollectionViewCell {
    var delegate: MyCellDelegate!
}

class MyViewController: UIViewController {
    //lets say this is your view controller and datasource
}

extension MyViewController: UICollectionViewDataSource {
    //Methods are not implemeted here
    //But you can set the delegate of the cell in cellForRowAtIndex method which is your view controller
}

extension MyViewController: MyCellDelegate {
   func reloadData() {
        //Here you reload the collection view
   }
}

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Following suggestions in the comments:

extension UICollectionViewCell {

    /// The collection view that presents this cell.
    weak var collectionView: UICollectionView! {
        return self.superview as! UICollectionView
    }
}

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You can try

 class MyCell: UICollectionViewCell, UICollectionViewDataSource {

    weak var outerCollectionView: UICollectionView!
 }

and set it in cellForRowAt

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    guard let cell = self.collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath) as? MyCell else { fatalError("Unexpected indexPath") }
    cell.outerCollectionView = collectionView
    return cell
}

//

Or you can try to cast the superView like this

let collectionView = self.superView as! UICollectionView

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Comments
  • Just use delegate and @protocol.
  • @user3344236 Thank you -- so there is no built-in method or variable that gives this information from within UICollectionViewCell?
  • What is the reason for making a collection view cell as collection view data source? I think its really a bad idea.
  • @AkshaysinghYaduvanshi Yes this was a typo -- fixed now. I still want access to the collectionView instance from MyCell, however.
  • @Alex What is the reason for doing that? I am just asking to see if i can provide a better solution for doing the same.
  • no need for as? if you're 100% crashes will guide you
  • @Sh_Khan Does this not crash with a fatal error though if somehow a UICollectionViewCell has not been placed within a UICollectionView? Do you recommend forcing the downcast using: return self.superview as! UICollectionView
  • a cellection cell can only be a subview for a UICollectionView no other options
  • Thanks for your response. I don't think MyCell wants the UICollectionViewDataSource but rather MyViewController should have that.
  • you can try self.superView
  • Definitely make that a weak property, or you’re causing a retain cycle.
  • @ABeard89 does the answer below as an extension make sense?
  • If you absolutely need to do this, I think this answer is the better option, since Apple could change the view hierarchy on a whim. That being said, there isn’t a standard way to do this because it’s bad form. I would advise against this sort of thing and employ a delegate pattern instead—the cell shouldn’t need to reference the collection view.