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ios - UITableView 滑动编辑

问题描述

我有两个 uitableviewcontroller ，一个是列表表，另一个是编辑表。我使用附件动作来编辑项目。它工作正常。

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if  segue.identifier == "EditItem" {
        let controller = segue.destination as! ItemDetailViewController
        controller.delegate = self
        if let indexPath = tableView.indexPath(for: sender as! UITableViewCell) {

            controller.itemToEdit = items[indexPath.row]
        }
    }
}

现在我添加滑动功能来编辑项目

override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {

    let edit = UIContextualAction(style: .normal, title: "Edit") { action, view, completion in
        self.performSegue(withIdentifier: "EditItem", sender: self)

        completion(true)
    }

    let delete = UIContextualAction(style: .destructive, title: "Delete") { [weak self] action, view, completion in
        self?.items.remove(at: indexPath.row)
        tableView.deleteRows(at: [indexPath], with: UITableView.RowAnimation.automatic)
        self?.saveChannelListItems()
        completion(true)
    }

    edit.backgroundColor = .purple
    edit.image = #imageLiteral(resourceName: "edit")
    delete.backgroundColor = .red
    delete.image = #imageLiteral(resourceName: "delete")


    return UISwipeActionsConfiguration(actions: [delete, edit])
}

然后我有错误。

无法将“abc.ListController”（0x1089b1398）类型的值转换为“UITableViewCell”（0x1150f18e0）。

如何滑动以编辑项目？

标签： iosswiftuitableviewsegueswipe

解决方案

在这里你发送self哪个是 vc insender参数

self.performSegue(withIdentifier: "EditItem", sender: self)

并强制将其解包到问题所在的单元格

if let indexPath = tableView.indexPath(for: sender as! UITableViewCell) {

相反，你可以做

self.performSegue(withIdentifier: "EditItem", sender:items[indexPath.row])

和

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if  segue.identifier == "EditItem" {
         let controller = segue.destination as! ItemDetailViewController
         controller.delegate = self 
         controller.itemToEdit = sender as! ItemType // where ItemType is the type of the array elements 
        }
    }
}

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