问删除UITableView中的行要花费太多的时间

EN

var allProducts = [Product]()
@IBOutlet weak var searchTableView: UITableView!
@IBOutlet weak var searchTextField: UITextField?

var searchResults = [Product]()

enum Action{
    case Insert
    case Ignore
    case Remove
}

override func viewDidLoad() {
    super.viewDidLoad()
    searchTextField?.addTarget(self, action: #selector(ViewController.textFieldDidChanged(_:)), for: .editingChanged)
    DBBrain().getAllAlcProducts() { [weak self] products in
        self?.allProducts = products
    }
}

func textFieldDidChanged(_ sender: UITextField){
    DispatchQueue.global(qos: .userInitiated).async { [weak self] in
        let text = sender.text!.lowercased()
        let res = self!.allProducts.filter({ $0.name.lowercased().contains(text) })
        if self?.searchTextField?.text != nil && text == self!.searchTextField!.text!{
            if let values = self?.getIndexes(forResults: res){
                self?.searchResults = res
                self?.updateTable(action: values.0, indexes: values.1)
            }
        }
    }
}

private func getIndexes(forResults products: [Product]) -> (Action, [IndexPath]){
    var indexes = [IndexPath]()
    var action = Action.Ignore
    if searchResults.count > products.count{
        var newCounter = 0
        for x in 0..<searchResults.count {
            if products.isEmpty || searchResults[x].id != products[newCounter].id {
                indexes.append(IndexPath(row: x, section: 0))
            }else {
                if newCounter < products.count - 1{
                    newCounter += 1
                }
            }
        }
        action = Action.Remove
    }else if searchResults.count < products.count{
        var oldCounter = 0
        for x in 0..<products.count {
            if searchResults.isEmpty || searchResults[oldCounter].id != products[x].id {
                indexes.append(IndexPath(row: x, section: 0))
            }else {
                if oldCounter < searchResults.count - 1 {
                    oldCounter += 1
                }
            }
        }
        action = Action.Insert
    }
    return (action, indexes)
}

private func updateTable(action: Action, indexes: [IndexPath]) {
    DispatchQueue.main.async { [weak self] in
        if action != .Ignore {
            if action == .Remove {
                self?.searchTableView.beginUpdates()
                self?.searchTableView.deleteRows(at: indexes, with: .fade)
                self?.searchTableView.endUpdates()
            }else if action == .Insert {
                self?.searchTableView.beginUpdates()
                self?.searchTableView.insertRows(at: indexes, with: .fade)
                self?.searchTableView.endUpdates()
            }
        }
    }
}


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