iPad旋转设备时仅关闭显示中的MenuViewController方案咨询

方案一：保存当前弹出的导航控制器引用（推荐） #

通过跟踪当前正在呈现的导航控制器实例，精准控制仅在菜单存在时执行关闭操作，避免误触父控制器。

1. 调整变量定义与弹出逻辑，新增导航控制器引用并监听关闭事件：

private var currentMenuNavController: UINavigationController?
private lazy var menuPadViewController = MenuViewController()

private func presentMenuVC(from sourceView: UIButton) {
    let nc = UINavigationController(rootViewController: menuPadViewController)
    nc.modalPresentationStyle = .popover
    nc.popoverPresentationController?.sourceView = sourceView
    // 设置代理监听菜单关闭，及时清空引用
    nc.presentationController?.delegate = self
    present(nc, animated: true)
    currentMenuNavController = nc
}

2. 实现代理方法，在菜单关闭时清空导航控制器引用：

extension YourViewController: UIAdaptivePresentationControllerDelegate {
    func presentationControllerDidDismiss(_ presentationController: UIPresentationController) {
        currentMenuNavController = nil
    }
}

3. 修改旋转逻辑，仅在导航控制器存在且处于呈现状态时执行关闭：

public override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    guard let menuNav = currentMenuNavController, menuNav.presentingViewController != nil else {
        return
    }
    menuNav.dismiss(animated: true)
    currentMenuNavController = nil
}

方案二：直接判断菜单的呈现状态 #

无需引入代理，通过检查菜单控制器或其导航控制器的presentingViewController是否存在，判断是否需要关闭：

public override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    // 验证菜单是否处于被呈现状态
    let isMenuPresented = menuPadViewController.presentingViewController != nil || 
                          (menuPadViewController.navigationController?.presentingViewController != nil)
    if isMenuPresented {
        menuPadViewController.dismiss(animated: true)
    }
}

方案三：利用Popover专属可见性判断 #

针对popover场景，直接通过popoverPresentationController的isPopoverVisible属性判断：

public override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator) {
    super.viewWillTransition(to: size, with: coordinator)
    guard let popoverPC = menuPadViewController.navigationController?.popoverPresentationController, 
          popoverPC.isPopoverVisible else {
        return
    }
    menuPadViewController.dismiss(animated: true)
}

内容的提问来源于stack exchange，提问作者martin wotterman