Question

当用户从UITableCell a 中选择UITableViewController时，显示segue 会向UINavigationController执行

：

import UIKit

class ItemNavigationController: UINavigationController {

    // this is our "model" - its value is set by the "prepareForSegue" method of the parent UITableViewController
    var item: String?

    override func viewDidLoad() {
        super.viewDidLoad()

        // here I want to "forward" the "model" to the ItemViewController
        // self.someMethodToGetItemViewController.item = item
    }

}

在ItemViewController上设置模型后，我们“刷新”标签：

import UIKit

class ItemViewController: UIViewController {

    var item: String!

    @IBOutlet
    weak var nameLabel: UILabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        // does not do anything because item is empty...
        nameLabel.text = item
    }

}

如何设置item ItemViewController的{{1}}属性？

Answer 1

如果ItemViewController是ItemNavigationController的topViewController，那么你可以通过调用topViewController方法直接获取它，否则，你应该循环遍历ItemNavigationController的viewControllers属性并找到它。

从UINavigationView到UIView的转发模型

1 个答案: