swift - 首先呈现 View Controller ，然后推送 subview Controller

Question

是否有技巧可以将之前以模态方式呈现的父 vc 推送到 subview Controller ？

我正在使用的呈现 parent 的方法:

    let parentVC = ParentController()
    self.present(parentVC, animated: true, completion: nil)

然后推送到不起作用的子 Controller 的方法:

    let childVC = childController()
    navigationController?.pushViewController(childVC, animated: true)

Answer 1

Is there a trick to push to child view controllers from a parent vc that previously has been presented modally?

如果你模态地呈现一个vc并且你想要这个vc推送一个child vc，你必须呈现vc 嵌入到 UINavigationController 中。

    let parentVC = ParentController()
    self.present(parentVC, animated: true, completion: nil)

成为

    let parentVC = ParentController()
    let parentNav = UINavigationController(rootViewController: parentVC)
    self.present(parentNav, animated: true, completion: nil)

然后你可以在parentVC中做:

    let childVC = childController()
    navigationController?.pushViewController(childVC, animated: true)