如何使用自定义操作删除部分中的单元格？

Question

我也一直在努力使用 trailingSwipeActionsConfigurationForRowAt 删除表格视图中的单元格我已将其设置为在您滑动单元格的位置显示删除图像，并在按下删除图像时显示 alertView 并询问是否您要删除该行。但是一旦按下是，单元格就不会 deleted/removed

import UIKit

class CartViewController: UIViewController {

    var selectedProduct: ItemList!       // allows data to be passed into the CartVC

    // allows data to be sepearted into sections
    var cartItems: [CartItem] = []
    var groupedItems: [String: [CartItem]] = [:]
    var brandTitle: [String] = []

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.

        groupedItems = Dictionary(grouping: cartItems, by: {[=10=].itemList.brandName})
        brandTitle = groupedItems.map{[=10=].key}.sorted()
    }
}

extension CartViewController: UITableViewDelegate, UITableViewDataSource{

    func numberOfSections(in tableView: UITableView) -> Int {
        return brandTitle.count
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        let brand = brandTitle[section]
        return groupedItems[brand]!.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        let cartCell = tableView.dequeueReusableCell(withIdentifier: "CartCell") as! CartCell

        let brand = brandTitle[indexPath.section]
        let itemsToDisplay = groupedItems[brand]![indexPath.row]
        cartCell.configure(withCartItems: itemsToDisplay.productList)

        return cartCell
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        let cartHeader = tableView.dequeueReusableCell(withIdentifier: "CartHeader") as! CartHeader

        let headerTitle = brandTitle[section]
        cartHeader.brandName.text = "Brand: \(headerTitle)"

        return cartHeader
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 45
    }

    func tableView(_ tableView: UITableView, viewForFooterInSection section: Int) -> UIView? {
        let cartFooter = tableView.dequeueReusableCell(withIdentifier: "CartFooter") as! CartFooter

        let brand = brandTitle[section]
        let subtotal = groupedItems[brand]?.map { [=10=].getCartTotal() }.reduce(0, +) ?? 0
        cartFooter.cartTotal.text = String(subtotal)

        return cartFooter
    }

    func tableView(_ tableView: UITableView, heightForFooterInSection section: Int) -> CGFloat {
        return 150
    }

    func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        let edit = UIContextualAction(style: .normal, title: "") { (action, view, nil) in
            let refreshAlert = UIAlertController(title: "Deletion", message: "Are you sure you want to remove this item from cart? ", preferredStyle: .alert)

            refreshAlert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action: UIAlertAction!) in

            }))

            refreshAlert.addAction(UIAlertAction(title: "No", style: .default, handler: { (action: UIAlertAction!) in
                refreshAlert .dismiss(animated: true, completion: nil)
            }))

            self.present(refreshAlert, animated: true, completion: nil)
        }
        edit.backgroundColor = .red
        edit.image = #imageLiteral(resourceName: "best_sellers")
        let config = UISwipeActionsConfiguration(actions: [edit])
        config.performsFirstActionWithFullSwipe = false
        return config
    }
}

Answer 1

iOS 检查删除操作前后的行数，并期望它们在 change.In 您需要删除当前对象的警报操作后正确加起来。

refreshAlert.addAction(UIAlertAction(title: "Yes", style: .default, handler: { (action: UIAlertAction!) in
             tableView.beginUpdates()
             // brandTitle[indexPath.section].remove(at: indexPath.row) // or you can directly use this

              let brand = brandTitle[indexPath.section]                                        
                 groupedItems[brand]!.remove(at:indexPath.row)
                   tableView.deleteRows(at: [indexPath], with: .fade)
                   tableView.endUpdates()
         }))

如何使用自定义操作删除部分中的单元格？

How to delete a cell in a section using custom action?

uitableview

delete-row

ios

swift