如何在Firebase Database Swift中搜索

Question

am试图在我的Firebase数据库中使用UISearchbar，但是我不知道我的代码是否为rghit，因为我每次运行它时都会崩溃，这是我的代码

var hotelList = [hotelsModel]()
var hotelsArray : [NSDictionary] = []
var filterHotels : [NSDictionary] = []
var databaseRef = Database.database().reference()


databaseRef.child("Hotels").queryOrdered(byChild: "name").observe(.childAdded, with: { (snapshot) in
        self.hotelsArray.append(snapshot.value as! NSDictionary)

        self.tableView.insertRows(at: [IndexPath(row: self.hotelsArray.count-1, section: 0)], with: UITableView.RowAnimation.automatic)

1. 列表项

   }) { (error) in
       print(error.localizedDescription)
   }
   

   func tableView（_ tableView：UITableView，cellForRowAt indexPath：IndexPath）-> UITableViewCell {     //使用自定义类创建单元     让cell = tableView.dequeueReusableCell（withIdentifier：“ cell”，for：indexPath）为！ hotelsTableViewCell

   let hotelSearch : NSDictionary?
   //the artist object
   var hotel: hotelsModel
   //getting the artist of selected position
   //hotel = hotelList[indexPath.row]
   if searchController.isActive && searchController.searchBar.text != "" {
   
       hotelSearch = filterHotels[indexPath.row] as! NSDictionary
   } else {
       //getting the artist of selected position
       hotel = hotelList[indexPath.row]
   }
   
   //getting the artist of selected position
   hotel = hotelList[indexPath.row]
   //adding values to labels
   cell.lblName.text = hotel.name
   cell.lblLocation.text = hotel.location
   cell.appSuggest.text = hotel.appSuggest
   cell.price.text = hotel.price
   cell.canceletion.text = hotel.cancelation
   cell.paymentNeeded.text = hotel.paymentNeeded
   
   if let imgUrl = hotel.img{
       let url = URL(string: imgUrl)
       cell.img.kf.setImage(with: url)
       cell.img.clipsToBounds = true
       cell.img.layer.cornerRadius = 10
       cell.img.layer.shadowColor = UIColor.black.cgColor
       cell.img.layer.shadowOpacity = 1.8
       cell.img.layer.shadowOffset = CGSize(width: 5, height: 0)
   }
         return cell
   

   } func updateSearchResults（用于searchController：UISearchController）{     //更新搜索栏结果     //filterHotels(serachText:searchController.searchBar.text！）     filterHotels.removeAll（）     filterHotels = hotelsArray.filter（{（text）-> Bool in         让tmp：NSString =（text as？NSString ?? nil）?? ”         让范围= tmp.range（of：searchController.searchBar.text !,选项：NSString.CompareOptions.caseInsensitive）         返回range.location！= NSNotFound     }）     self.tableView.reloadData（） }

它在此行中崩溃了

self.hotelsArray.append(snapshot.value as! NSDictionary)

我该如何解决？

谢谢