ios - ViewDidAppear 未调用添加到 rootViewController 的 subview

Question

我试图在屏幕上所有元素(包括导航栏)的顶部显示一个 subview Controller ，我发现唯一可行的方法是将它作为 subview Controller 添加到我窗口的 rootViewController:

guard let window = UIApplication.shared.keyWindow,
        let view = window.rootViewController?.view
        else { return }
window.rootViewController?.addChildViewController(attachmentViewController)
view.addSubview(attachmentViewController.view)
attachmentViewController.view.snp.makeConstraints { make in
    make.left.equalTo(view)
    make.right.equalTo(view)
    make.top.equalTo(view)
    make.bottom.equalTo(view)
}
attachmentViewController.didMove(toParentViewController: window.rootViewController)

但是，这不会调用 viewDidAppear 或 viewWillDisappear 方法...这是为什么呢？我真的需要它。

Answer 1

无需执行所有这些操作，只需呈现 View Controller (不要按照建议推送)。

let destination = SomeViewController.instantiateFromStoryboard(self.storyboard!)
present(destination, animated: true, completion: nil)