向下滚动表视图时添加分页

我想对数据进行分页。滚动表视图时添加分页的最佳方式是什么?我尽量不同时显示所有数据。例如,每当用户点击表视图的底部时,接下来的10个表视图单元格就会加载到(10、20、30等等)中。我使用的是Swift和Firestore。这是我的密码。谢谢

     import UIKit
     import FirebaseCore
     import FirebaseFirestore
     import FirebaseAuth

     class MainTableViewController: UIViewController {

     var itemArray:[Item] = []
     var item:Item!


     override func viewDidLoad() {
    super.viewDidLoad()
    
    
   loadListingItems()
  
    
    }


func ListingdownloadITemsFromFirebase(completion: @escaping (_ 
 itemArray: [Item]) -> Void) {
    
    var itemArray: [Item] = []
    
  
   FirebaseReference(.Items).whereField(KISCAR, isEqualTo: true) 
    .order(by: kDATEPOSTED , descending: true).limit(to: 10
    ).getDocuments { (snapshot, error) in
        
        guard let snapshot = snapshot else {
            completion(itemArray)
            return
        }
        
        if !snapshot.isEmpty {
            
            for itemDict in snapshot.documents {
                
                itemArray.append(Item(_dictionary: 
           itemDict.data() as NSDictionary))
            }
        }
        
        completion(itemArray)
    }
}

    private func loadListingItems() {
    
    ListingdownloadITemsFromFirebase { (allITems) in
        print("we have ",allITems.count)
        self.itemArray = allITems
        self.tableView1.reloadData()
    }
}

     func tableView(_ tableView: UITableView, 
      numberOfRowsInSection section: Int) -> Int {
    
        return itemArray.count
        
    }
    

   func tableView(_ tableView: UITableView, cellForRowAt 
   indexPath: IndexPath) -> UITableViewCell {

   cell.generateCell(itemArray[indexPath.row], indexPath: 
   indexPath)

}

}