圣诞快乐!我目前正在制作一个“提醒”应用程序。我的“辅助”TableView 无法将数据传回“主”TableView。 (请参见下图)。我需要将数据传回“主”TableView，以便我可以保存它并将其显示到另一个 TableView，这样用户就可以看到他们放入的任务。

IconTableViewController(和 ShowTableViewController)中的代码:

var userImage: String = ""
var userTitle: String = ""
var userDesc: String = ""
var frequency: String = ""

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if let navigationViewController = segue.destination as? UINavigationController {

        guard let viewController = navigationViewController.topViewController as? NewItemTableViewController else { return }

        let userImageNew = userImage
        let userTitleOld = userTitle
        let userDescOld = userDesc
        let frequencyOld = frequency

        viewController.selectedImage = userImageNew
        viewController.userTitle = userTitleOld
        viewController.userDesc = userDescOld
        viewController.selectedFrequency = frequencyOld
    }
}

NewItemTableViewController 中的代码:

var selectedImage: String = ""
var selectedFrequency: String = ""
var userTitle: String = ""
var userDesc: String = ""

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showSelect" {
        let userImageOld = selectedImage
        let userTitleNew = titleTextField.text
        let userDescNew = descTextView.text
        let frequencyOld = selectedFrequency

        let viewController = segue.destination as! ShowTableViewController
        viewController.userImage = userImageOld
        viewController.userTitle = userTitleNew!
        viewController.userDesc = userDescNew!
        viewController.frequency = frequencyOld
    }

    if segue.identifier == "iconSelect" {
        let userImageOld = selectedImage
        let userTitleNew = titleTextField.text
        let userDescNew = descTextView.text
        let frequencyOld = selectedFrequency

        let viewController = segue.destination as! IconTableViewController
        viewController.userImage = userImageOld
        viewController.userTitle = userTitleNew!
        viewController.userDesc = userDescNew!
        viewController.frequency = frequencyOld
    }
}

非常感谢您的帮助!

最佳答案

似乎 NewItemTableViewController 还不是导航堆栈中的顶级 viewController。尝试以同样简单的方式访问它，

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    if let viewController = segue.destination as? NewItemTableViewController {

        let userImageNew = userImage
        let userTitleOld = userTitle
        let userDescOld = userDesc
        let frequencyOld = frequency

        viewController.selectedImage = userImageNew
        viewController.userTitle = userTitleOld
        viewController.userDesc = userDescOld
        viewController.selectedFrequency = frequencyOld
    }
}

你应该在上面的方法 prepare(for segue 中放置一个断点，看看它是否被调用。因为我觉得你没有 unwind segue 因为这些 viewControllers 只是被推送到导航堆栈。所以在这种情况下，您还可以使用 viewWillDisappear 通过从导航堆栈访问 NewItemTableViewController 来设置数据。如下所示，

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)

    if let vc = self.navigationController?.viewControllers.first(where: { $0 is NewItemTableViewController }) as? NewItemTableViewController {
        // Set data.
    }
}

关于ios - 无法在 TableViewController 之间传递数据，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/53919259/