如何在集合视图单元格上显示coreData（swift4）

Question

My code below would work if it was displayed on a label. But in this function I am getting the error message Missing return in a function expected to return 'UICollectionViewCell'. Putting the return cell in the for loop does not work.

       import UIKit

class collectionVIEW: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

        var users = [User]()
    @IBOutlet var theIssues: UICollectionView!
    override func viewDidLoad() {
        super.viewDidLoad()

//        users = cdHandler.fetchObject()!

    }


    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

        return users.count

    }

    func getDefaultCell() -> UICollectionViewCell{
                    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! whyCollectionViewCell
    }
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {


        if cdHandler.fetchObject() != nil {
            users = cdHandler.fetchObject()!

            for c in users {

                let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! whyCollectionViewCell
                cell.general.text = "\((cell.general.text)!)+\((c.userName)!)"

                return cell
            }

        } else {
            return getDefaultCell()
        }



    }




}

Answer 1

cellForItemAt method expects to return UICollectionViewCell in all cases. In the else condition, return a default cell as below:-

  func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    if cdHandler.fetchObject() != nil {
        users = cdHandler.fetchObject()!

        for c in users {

       let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! whyCollectionViewCell
            cell.general.text = "\((cell.general.text)!)+\((c.userName)!)"

        return cell
                }

        }else{
           return getDefaultCell()
}

Note:-Register collection view with identifier defaultCcell

func getDefaultCell() -> UICollectionViewCell{
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "defaultCcell", for: indexPath) as! UICollectionViewCell
return cell 
}