ios - 将数据从容器 View 传递到 MainViewController

Question

我有这个代码:

MainViewControler:
class MainViewControler: UIViewController, ContainerToMaster {
    @IBOutlet weak var systemContainerView: UIView!
    @IBOutlet weak var favoriteProductBtn2: UIButton!
    weak var containerViewController: Calculator1ViewController?

    func changeBtn() {
        favoriteProductBtn2.isHidden = true
        print("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
    }
}


CallculatorViewController:
@IBOutlet weak var containerView: UIView!

class CallculatorViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
}


Calculator1ViewController:
protocol ContainerToMaster {
    func changeBtn()
}

class Calculator1ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        containerToMaster?.changeBtn()
    }
}

我有这样一个应用布局:

1. 主视图 = MainViewControler。在 MainViewControler 中，我有一个 containerView (systemContainerView)，MainViewControler 位于其中

2. 在 CallculatorViewController 中，我有 Calculator1ViewController 所在的下一个 containerView。

当进入 Calculator1ViewController 时，函数:containerToMaster?.changeBtn() 应该启动(它应该在 MainViewControler 中工作)。

问题是 - 这个函数不起作用:(

有人知道怎么解决吗？

Answer 1

包含的 viewController 嵌入了 embed segue。您需要覆盖 prepare(for:sender) 并将 self 设置为目标 viewController 中的 containerToMaster 委托(delegate)。由于您有一个容器 View 嵌入到另一个容器 View 中，因此您的情况很复杂，因此您需要设置两个委托(delegate)并传回按钮回调:

protocol ContainerToMaster {
    func changeBtn()
}


class MainViewControler: UIViewController, ContainerToMaster {
    @IBOutlet weak var systemContainerView: UIView!
    @IBOutlet weak var favoriteProductBtn2: UIButton!
    weak var containerViewController: Calculator1ViewController?

    func changeBtn() {
        favoriteProductBtn2.isHidden = true
        print("XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX")
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destVC = segue.destination as? CallculatorViewController {
            destVC.containerToMaster = self
        }
    }
}

class CallculatorViewController: UIViewController, ContainerToMaster {
    weak var containerToMaster: ContainerToMaster?

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    func changeBtn() {
        // pass the button call back
        containerToMaster?.changeBtn()
    }

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if let destVC = segue.destination as? Calculator1ViewController {
            destVC.containerToMaster = self
        }
    }
}

class Calculator1ViewController: UIViewController {
    weak var containerToMaster: ContainerToMaster?

    override func viewDidLoad() {
        super.viewDidLoad()
        containerToMaster?.changeBtn()
    }
}