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

Re-watching videos from WWDC14 I think I've found a better answer.

1. Use a custom UISplitViewController (subclass)
2. Override the showDetailViewController operation
3. Use the traitCollection to determine the class of the UISplitViewController
4. If the horizontal class is Compact, get the navigationController to call showViewController

Here is the the code of the custom UISplitViewController :

import UIKit

class CustomSplitViewController: UISplitViewController {

    override func showDetailViewController(vc: UIViewController!, sender: AnyObject!) {

        if (self.traitCollection.horizontalSizeClass == UIUserInterfaceSizeClass.Compact) {
            if let tabBarController = self.viewControllers[0] as? UITabBarController {
                if let navigationController = tabBarController.selectedViewController as? UINavigationController {
                    navigationController.showViewController(vc, sender: sender)
                    return
                }
            }
        }

        super.showDetailViewController(vc, sender: sender)
    }
}

Do not forget to the set the custom class in the storyboard.

Tested in the simulator of iPhone 6, iPhone 6+ and iPad Air and worked as expected.