如何从应用程序委托打开我的段控制器的段索引？

Question

我想在打开本地通知时显示“菜单视图控制器”。我在“菜单视图控制器”中使用了一个段控件，当通过本地通知打开视图时，它应该设置为 selectedSegmentIndex = 0。我能够打开视图控制器，但我不知道如何从应用程序委托解决段控制？ 这是我使用的代码：

 // open the menu view controller when notification is pressed

    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        let scene = UIApplication.shared.connectedScenes.first
        if let sceneDelegate = scene?.delegate as? SceneDelegate {  
            if let tabController = sceneDelegate.window?.rootViewController as? UITabBarController {
                  tabController.selectedIndex = 0 // index for menu view conntroller
            }
        }

        // set selected index of the segment control equal to zero


        completionHandler()

    }

这是我的故事板的外观：

Answer 1

我没试过你的答案，但试试这个

步骤：

一开始需要获取tabbarcontroller的viewcontrollers，像这样

 if  let getMenuVC = tabController.viewControllers.first, let getMenu = getMenuVC as? yourMenuController{
  }  

那么你需要获取当前类作为你的 menuviewcontroller 就像

  if let getMenu = getMenuVC as? yourMenuController{
  }  

最后你需要更新当前类的段选择索引

   if let getMenu = getMenuVC as? yourMenuController{
         getMenu.yourSegmentedControlName.selectedSegmentIndex = 0
getMenu.yourSegmentedControlName.sendActions(for: UIControl.Event.valueChanged)
      }

最终代码为：

 if let tabController = sceneDelegate.window?.rootViewController as? UITabBarController {
                  tabController.selectedIndex = 0 // index for menu view conntroller
             if  let getMenuVC = tabController.viewControllers?.first, let getMenu = getMenuVC as? yourMenuController{
         getMenu.yourSegmentedControlName.selectedSegmentIndex = 0
getMenu.yourSegmentedControlName.sendActions(for: UIControl.Event.valueChanged)
      }
            }