trailingSwipeActionsConfigurationForRowAt 不穩定

Question

我正在嘗試為 iOS 11 及更高版本制作可滑動的表格視圖單元格並嘗試使用trailingSwipeActionsConfigurationForRowAt但它適用於 iPad 而不適用於 iPhone。
iPhone 中沒有調用它。
令人驚訝的是，如果我嘗試將單元格滑動超過 10 或 20 次，它有時會起作用一次。

這是我的控制器的表視圖擴展

import UIKit

extension CustomViewController: UITableViewDelegate, UITableViewDataSource {
    func initTableView() {
        tableView.register(cell: SingleLineListItemViewCell.self)
        tableView.delegate = self
        tableView.dataSource = self
        tableView.estimatedRowHeight = 64
        tableView.rowHeight = UITableView.automaticDimension

        tableView.backgroundColor = .green
        tableView.isEditing = false
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return 3
    }

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

        let model = SingleLineListItemViewModel(title: "coko")

        let cell = tableView.dequeueReusableCell(withIdentifier: SingleLineListItemViewCell.reuseIdentifier) as? SingleLineListItemViewCell
        cell?.model = model
        cell?.isFirst = indexPath.row == 0
        cell?.isLast = indexPath.row == 2
        return cell!
    }

    func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
        return nil
    }

    func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
        return 0
    }

    func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
        return  100
    }

    func tableView(_ tableView: UITableView, estimatedHeightForRowAt indexPath: IndexPath) -> CGFloat {
        return 64.0
    }

    func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        tableView.deselectRow(at: indexPath, animated: true)
        print("didSelectRowAt....")
        router?.routeToTransfer()
    }

    func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
        return true
    }

    @available(iOS 11.0, *)
    func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        return nil
    }

    func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
        // Action here
        // In case of delete, you can simply do:
        if editingStyle == .delete {
            //Remove item at relative position from datasource array
            //Reload tableview at the respective indexpath
        }
    }

    @available(iOS 11.0, *)
    func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        let deleteAction = UIContextualAction(style: .destructive, title: "Delete") { _, _, _ in
            //YOUR_CODE_HERE
        }
        deleteAction.backgroundColor = .red
        let configuration = UISwipeActionsConfiguration(actions: [deleteAction])
        configuration.performsFirstActionWithFullSwipe = false
        return configuration
    }
}

任何幫助將非常感激。

Answer 1

唯一明顯的錯誤是您沒有調用完成處理程序。 根據 API 文檔，需要調用完成處理程序來指示操作是否成功。 它實際上是什么我不知道......

func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
    let deleteAction = UIContextualAction(style: .destructive, title: "Delete") { _, _, completionHandler in
       //YOUR_CODE_HERE
       completionHandler(true)
     }
     deleteAction.backgroundColor = .red
     let configuration = UISwipeActionsConfiguration(actions: [deleteAction])
     configuration.performsFirstActionWithFullSwipe = false
     return configuration
}

如果這沒有任何區別，您是否還有其他可能與滑動動作沖突的手勢識別器？

Answer 2

你可以試試這個

func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
    return true
}

func tableView(_ tableView: UITableView, titleForDeleteConfirmationButtonForRowAt indexPath: IndexPath) -> String? {
    return "Delete"
}

// this method handles row deletion
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {

    if editingStyle == .delete {

        // remove the item from the data model

        // delete the table view row
        tableView.deleteRows(at: [indexPath], with: .fade)

    } else if editingStyle == .insert {
        // Not used in our example, but if you were adding a new row, this is where you would do it.
    }
}

func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
    let action = UIContextualAction(
        style: .normal,
        title: "Delete",
        handler: { (action, view, completion) in
            //do what you want here
            completion(true)
    })

    action.backgroundColor = .red
    let configuration = UISwipeActionsConfiguration(actions: [action])
    configuration.performsFirstActionWithFullSwipe = false
    return configuration
    }

Answer 3

這里也定義了動作（第 1 點和第 2 點）；

func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
    let deleteAction = UIContextualAction(style: .destructive, title: "") { _, _, completionHandler in

        // 1. remove object from your array
        scannedItems.remove(at: indexPath.row)
        // 2. reload the table, otherwise you get an index out of bounds crash
        self.tableView.reloadData()

        completionHandler(true)
    }
    deleteAction.backgroundColor = .systemOrange
    deleteAction.image = UIImage(named: "trash")
    let configuration = UISwipeActionsConfiguration(actions: [deleteAction])
    configuration.performsFirstActionWithFullSwipe = true
    return configuration
}