如何将一堆 UIViewControllers 解散到某个 Root ViewController? [英] How to dismiss a stack of UIViewControllers to a certain Root ViewController?

问题描述

某些 RootViewController 呈现一个 ParentViewController，然后呈现一个 ChildViewController.

如何在不再次显示 ParentViewController 的情况下将 ChildViewController 动画 直接关闭到 RootViewController?><小时>

详细

• 假设某些人提供了 ParentViewController，它允许用户输入一些凭据以登录到某个用户帐户.
• 一旦建立连接，ParentViewController 就会显示 ChildViewController，它向用户显示连接/帐户详细信息
• 当用户关闭 ChildViewController 时，它应该被解除动画(向下滑动等).但不是返回到 ParentViewController 用户应该直接返回到 RootViewController

当然有可能，ParentViewController 不显示 ChildViewController 本身，而是(以某种方式)告诉 RootViewController 这样做.这样直接从ChildViewController返回到RootViewController就没有问题了.然而，这不是我正在寻找的，因为 RootViewController 不应该知道 ChildViewController 甚至不关心 ParentViewController 介绍其他 VC.

我正在寻找一种解决方案，其中 ParentViewController 控制是在它呈现的 VC 被解散后还是显示它的父级(= 根 VC).

代码:

typealias CompletionBlock = () ->空白类 RootViewController: UIViewController {@IBAction func showParentVC(_ sender: Any) {让 parentVC = ParentViewController()parentVC.completion = {self.dismiss(动画:true，完成:nil)}存在(parentVC，动画:真)}}类 ParentViewController: UIViewController {var 完成:CompletionBlock?@IBAction func showChild(_ sender: Any) {让 childVC = ChildViewController()childVC.completion = {self.completion?()}礼物(childVC，动画:真)}}类 ChildViewController: UIViewController {var 完成:CompletionBlock?@IBAction func close(_ sender: Any) {完成?()}}

使用此代码不能解决所描述的问题.如果 close 在 ChildViewController 上被调用，RootViewController 会调用 self.dismiss(animated: true, completion: nil).这样 ChildViewController 动画消失并且 ParentViewController 变得可见.然后 ParentViewController 动画消失并且 RootViewController 变得可见.

动画去掉ChildViewController后，如何跳过ParentViewController直接显示RootViewController?

解决方案

我的建议是将您的 RootViewController 嵌入到 NavigationController 中(如果您还没有)，并为父母双方提供一个孩子

navigationController?.present(viewController, animation: true, completion: nil)//而不是 viewController.present(...)

然后你可以在你的 childViewController 中使用这个方法

navigationController?.popToRootViewController(animated: true)

Some RootViewController presents a ParentViewController which than presents a ChildViewController.

How can I dissmiss the ChildViewController animated directly to the RootViewController whithout showing the ParentViewController again?

---

In Detail

• Assume some presents the ParentViewController which lets the user enter some credentials to login to some user account.
• Once the connection is established the ParentViewController presents the ChildViewController which shows connection / account details to the user
• When the user closes the ChildViewController it should be dismissed animated (slide down, etc.). But instead of returning to the ParentViewController the user should get back directly to the RootViewController

Of course it would be possible, that the ParentViewController does not present the ChildViewController itself but (somehow) tells the RootViewController to this. This way it would be no problem to directly return from the ChildViewController to the RootViewController. However, this is NOT what I am looking for, since the RootViewController should not know about the ChildViewController or even care if the ParentViewController presents other VCs.

I am looking for a solution where the ParentViewController controls whether itself is shown after the VC it presented is dismissed or its parent (= the root VC).

Code:

typealias CompletionBlock = () -> Void

class RootViewController: UIViewController {
    @IBAction func showParentVC(_ sender: Any) {
        let parentVC = ParentViewController()
        parentVC.completion = {
            self.dismiss(animated: true, completion: nil)
        }

        present(parentVC, animated: true)
    }
}

class ParentViewController: UIViewController {
    var completion: CompletionBlock?

    @IBAction func showChild(_ sender: Any) {
        let childVC = ChildViewController()
        childVC.completion = {
            self.completion?()
        }

        present(childVC, animated: true)
    }
}

class ChildViewController: UIViewController {
    var completion: CompletionBlock?

    @IBAction func close(_ sender: Any) {
        completion?()
    }
}

Using this code does NOT solve the described problem. If close is called on the ChildViewController the RootViewController calls self.dismiss(animated: true, completion: nil). This way the ChildViewController animates away and the ParentViewController becomes visible. Then the ParentViewController animates away and the RootViewControllerbecomes visible.

How to skip the ParentViewController and directly show the RootViewController after animating away the ChildViewController?

解决方案

My recommendation is embed your RootViewController into a NavigationController (if you don't have it yet) and present both parent a child with

navigationController?.present(viewController, animated: true, completion: nil)
//instead of viewController.present(...)

And then youcan use this method from your childViewController

navigationController?.popToRootViewController(animated: true)

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