ios - Swift UISwipeActionsConfiguration 和 segue

Question

我添加了leadingSwipeAction “编辑”按钮。但是，当我在模拟器中按下“编辑”按钮时，应用程序崩溃并在 **prepare(for:sender:)** 方法中显示“线程 1：信号 SIGBART”。

我看到了类似的问题，但他们的解决方案没有帮助。我是新手，不明白问题出在哪里。

`//my edit button code`
   override func tableView(_ tableView: UITableView, leadingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
        
        let edit = UIContextualAction(style: .normal, title: "Edit") { [self] (contextualAction, view, actionPrformed: (Bool) -> Void) in
            
            //TODO:
            
            performSegue(withIdentifier: "EditItem", sender: self)
            actionPrformed(true)
        }
        
            return UISwipeActionsConfiguration(actions: [edit])
        }

// segue

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        if segue.identifier == "AddItem" {
            let controller = segue.destination as! AddAndEditItemViewController
            controller.delegate = self
                    }
       
        else if segue.identifier == "EditItem" {
            let controller = segue.destination as! AddAndEditItemViewController
            controller.delegate = self
        
        if let indexPath = tableView.indexPath(
                  for: sender as! UITableViewCell) { //erorr shows here
                  controller.itemToEdit = items[indexPath.row]
                }                                           
    }

}

Answer 1

self这里

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

是 vc 实例本身而不是单元格，您需要传递 indexPath.row

performSegue(withIdentifier: "EditItem", sender: indexPath.row)

然后

let index = sender as! Int
controller.itemToEdit = items[index] 

你也可以使用

guard let index = tableView.indexPathForSelectedRow?.row else { return }