在子视图控制器之间切换

Question

我有一个包含多个容器视图的视图控制器，我们称之为 HomeViewController。我这样声明这些容器视图（childViewControllers）（每个都是一个容器视图，具有自己的嵌入式视图控制器：

private lazy var startContactViewController: StartContactViewController = {
    //Load Storyboard
    let storybaord = UIStoryboard(name: "Main", bundle: Bundle.main)

    //Instantiate View Controller
    var viewController = storyboard?.instantiateViewController(withIdentifier: "StartContact") as! StartContactViewController

    //Add View Controller as Child View Controller
    self.add(asChildViewController: viewController)

    return viewController
}()

private lazy var stopContactViewController: StopContactViewController = {
    //Load Storyboard
    let storybaord = UIStoryboard(name: "Main", bundle: Bundle.main)

    //Instantiate View Controller
    var viewController = storyboard?.instantiateViewController(withIdentifier: "StopContact") as! StopContactViewController

    //Add View Controller as Child View Controller
    self.add(asChildViewController: viewController)

    return viewController
}()

private lazy var startDayViewController: StartDayViewController = {
    //Load Storyboard
    let storybaord = UIStoryboard(name: "Main", bundle: Bundle.main)

    //Instantiate View Controller
    var viewController = storyboard?.instantiateViewController(withIdentifier: "StartDay") as! StartDayViewController

    //Add View Controller as Child View Controller
    self.add(asChildViewController: viewController)

    return viewController
}()

private lazy var loadingViewController: LoadingViewController = {
    //Load Storyboard
    let storybaord = UIStoryboard(name: "Main", bundle: Bundle.main)

    //Instantiate View Controller
    var viewController = storyboard?.instantiateViewController(withIdentifier: "loading") as! LoadingViewController

    //Add View Controller as Child View Controller
    self.add(asChildViewController: viewController)

    return viewController
}()

然后我有这两个函数来添加和删除 childViewControllers：

func add(asChildViewController viewController: UIViewController) {
    //Add Child View Controller
    addChildViewController(viewController)

    //Add Child View as Subview
    view.addSubview(viewController.view)

    //Configure Child View
    viewController.view.frame = view.bounds
    viewController.view.autoresizingMask = [.flexibleWidth, .flexibleHeight]

    //Notify Child View Controller
    viewController.didMove(toParentViewController: self)
}

func remove(asChildViewController viewController: UIViewController) {
    // Notify Child View Controller
    viewController.willMove(toParentViewController: nil)

    // Remove Child View From Superview
    viewController.view.removeFromSuperview()

    // Notify Child View Controller
    viewController.removeFromParentViewController()
}

当我的应用首次加载时，会显示 StartDayViewController。在这个视图控制器中，它们是一个按钮。当用户按下该按钮时，我希望删除 StartDayViewController 并显示 StartContactViewController。如何从 StartDayViewController 实现这一点？

我还附上了故事板的图片。 Storyboard image

Answer 1

你可以使用协议来做到这一点

protocol StartVcProtocol {
         func startButtonPressed()
}

让 HomeViewController 实现它

extension HomeViewController: StartVcProtocol {
    func startButtonPressed() {
        // start button pressed -- do your remove and add stuff here
    }
}

现在在 StartVc 中

class StartVc: UIViewController {

    var delegate: StartVcProtocol?


 //inside you start button iBaction
delegate?.startButtonPressed()

}

然后在懒惰的时候初始化StartVc

viewController.delegate = self

希望你得到所有的碎片。