如何从 UITableViewCell 的 UIContextualAction 显示弹出窗口 UIAlertController?

How to display a popover UIAlertController from a UITableViewCell's UIContextualAction?

我想在 UITableViewCell 中通过 UIContextualAction 'button' 呈现 UIAlertController。我的问题是如何为特定的 selected 操作设置 sourceRect?我认为这是可能的,当您在单元格上向左滑动时,iOS 邮件应用程序允许您 select 更多选项(见图)。

设置操作时,它有一个 view 参数。使用它来设置操作 sheet.

override func tableView(_ tableView: UITableView, trailingSwipeActionsConfigurationForRowAt indexPath: IndexPath) -> UISwipeActionsConfiguration? {
    let act1 = UIContextualAction(style: .normal, title: "Bar") { (action, view, completion) in
        completion(false)
    }

    let act2 = UIContextualAction(style: .normal, title: "Foo") { (action, view, completion) in
        let alert = UIAlertController(title: nil, message: nil, preferredStyle: .actionSheet)
        alert.addAction(UIAlertAction(title: "Option 1", style: .default) { (action) in
            completion(true)
        })
        alert.addAction(UIAlertAction(title: "Option 2", style: .default) { (action) in
            completion(false)
        })

        // This sets up the alert to show next to the button
        alert.popoverPresentationController?.sourceView = view
        alert.popoverPresentationController?.sourceRect = view.bounds

        self.present(alert, animated: true, completion: nil)
    }

    return UISwipeActionsConfiguration(actions: [act1, act2])
}

当然,这仅适用于 iPad,因为在 iPhone 上,警报将从屏幕底部显示。