Adaptive show detail segue transformed to modal instead of push on iPhone when master view controller is a UITabBarController

Question

In XCode 6, if you create a new project based on the Master-Detail Application template, you get a universal storyboard that is supposed to be good for all devices.

When

Answer 1

Unfortunately, the selected answer didn't work for me. However, I did eventually manage to solve the problem:

1. Subclass UISplitViewController and set the new class in Interface Builder.

2. Make the new class conform to UISplitViewControllerDelegate:

   required init?(coder aDecoder: NSCoder) {
       super.init(coder: aDecoder)
       self.delegate = self
   }
   

3. Implement these two methods:

   func splitViewController(_ splitViewController: UISplitViewController,
                            collapseSecondary secondaryViewController:UIViewController,
                            onto primaryViewController:UIViewController) -> Bool {
       return true
   }
   
   func splitViewController(_ splitViewController: UISplitViewController,
                            showDetail vc: UIViewController,
                            sender: Any?) -> Bool {
   
       if splitViewController.isCollapsed {
           guard let tabBarController = splitViewController.viewControllers.first as? UITabBarController else { return false }
           guard let selectedNavigationViewController = tabBarController.selectedViewController as? UINavigationController else { return false }
   
           // Push view controller
           var detailViewController = vc
           if let navController = vc as? UINavigationController, let topViewController = navController.topViewController {
               detailViewController = topViewController
           }
           selectedNavigationViewController.pushViewController(detailViewController, animated: true)
           return true
       }
       return false
   }