ios - 错误应用程序尝试以模态形式呈现事件 Controller Swift

有一个带有几个UIViewControllers的UITabBarController。在一个控制器内部，当满足特定条件时，我想实例化另一个UIViewController，它是同一UITabBarController的子级。
我一直收到此错误“应用程序尝试以模态显示一个活动的控制器”，但是我不知道scheduleNavController如何已经活动。我在SO上查找了几个答案，但是我仍然不明白我的错误是什么以及如何解决？
该应用程序的流程如下：WelcomeViewController，LoginViewController，UITabBarController和UITabBarController的子级。

   let storyboard = UIStoryboard(name: "Main", bundle: nil)
   let tabController = storyboard.instantiateViewController(withIdentifier: "CentralTabBarControllerID") as! UITabBarController

 if let viewControllers = tabBarController?.viewControllers {
     let scheduleNavController = viewControllers[1] as! UINavigationController
     let scheduleVC = scheduleNavController.childViewControllers[0] as! Schedule

       tabController.present(scheduleNavController, animated: true, completion: {
          scheduleVC.segmentedControlIndexReceivedFromClaimDetail = self.segmentedControlIndex
             })

        }

最佳答案

感谢Andreas Oetjen建议使用UITabBarController的selectedIndex，我提出了另一种解决方案。但是，我仍然不知道如何解决原始问题中的代码以使其正常工作。

 //select index of the UIViewController we want to switch to
// get the UINavigationController for the tab we want to switch to
// get UIViewController to which we want to pass data
 self.tabBarController?.selectedIndex = 1
 let scheduleNavController = tabBarController?.viewControllers?[1] as! UINavigationController
 let scheduleVC = scheduleNavController.childViewControllers[0] as! Schedule
 scheduleVC.segmentedControlIndexReceivedFromClaimDetail = self.segmentedControlIndex

//remove the the current UIViewController from which we switch to another controller above.
 let claimDetailNav = tabBarController?.viewControllers?[0] as! UINavigationController
  let claimDetailVC = claimDetailNav.childViewControllers[1] as! ClaimDetail
  claimDetailVC.removeFromParentViewController()

关于ios - 错误应用程序尝试以模态形式呈现事件 Controller Swift，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/49298209/