Int { switch section { case 0: return users.count case 1: return hobbies.count case 2: return teams.count default: fatalError() } } public func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell { switch (indexPath.section, indexPath.item) { case (0, _): let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "ACell", for: indexPath) as! UserCell cell.configure(with: users[indexPath.item]) ... return cell case (1, _): let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "BCell", for: indexPath) as! HobbyCell cell.configure(with: hobbies[indexPath.item]) ... return cell case (2, _): let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CCell", for: indexPath) as! TeamCell cell.configure(with: teams[indexPath.item]) ... return cell default: fatalError() } } ύλʔϯϚον͠ͳ͍߹ͷGBUBM&SSPS