Having a UINavigationController in the master view of a UISplitViewController in iOS 8

Question

In my UISplitViewController, the master view is a UINavigationController containing a UITableViewController. Sometime, when the user s

Answer 1

Swift 4 Version with minor changes to make it work with my code:

func splitViewController(_ splitViewController: UISplitViewController, showDetail vc: UIViewController, sender: Any?) -> Bool {
    if !isCollapsed {
        // in expanded mode set new VC as top view controller of the detail nav controller
        if let detailNavigationController = viewControllers[1] as? UINavigationController {
           detailNavigationController.setViewControllers([vc], animated: false)
        }
    } else {
        // in collapsed mode push the new view controller on the master nav controller
        if let masterNavigationController = viewControllers[0] as? UINavigationController {
            masterNavigationController.pushViewController(vc, animated: true)
        }
    }
    return true
}

func splitViewController(_ splitViewController: UISplitViewController, collapseSecondary secondaryViewController: UIViewController, onto primaryViewController: UIViewController) -> Bool {

    let masterNavigationController = primaryViewController as? UINavigationController
    let detailNavigationController = secondaryViewController as? UINavigationController
    let episodeDetailViewController = detailNavigationController?.viewControllers.first as? EpisodeDetailTableViewController
    if episodeDetailViewController?.episode == nil {
        // detail view is blank. We do not need to push this onto the master
        return true
    }

    guard var newMasterViewControllers = masterNavigationController?.viewControllers else { return false }
    newMasterViewControllers.append(contentsOf: detailNavigationController?.viewControllers ?? [])
    masterNavigationController?.setViewControllers(newMasterViewControllers, animated: false)
    return true
}


func splitViewController(_ splitViewController: UISplitViewController, separateSecondaryFrom primaryViewController: UIViewController) -> UIViewController? {
    let masterNavigationViewController = primaryViewController as? UINavigationController

    var newMasterViewControllers = [UIViewController]()
    var newDetailViewControllers = [UIViewController]()

    for vc in masterNavigationViewController?.viewControllers ?? [] {
        if vc is PodcastsTableViewController || vc is EpisodesTableViewController {
            newMasterViewControllers.append(vc)
        } else {
            newDetailViewControllers.append(vc)
        }
    }

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let detailNavigationController = storyboard.instantiateViewController(withIdentifier: "splitViewDetailViewController") as! UINavigationController

    if newDetailViewControllers.count == 0 {
        let emptyEpisodeDetailViewController = storyboard.instantiateViewController(withIdentifier: "episodeDetail")
        newDetailViewControllers.append(emptyEpisodeDetailViewController)
    }

    masterNavigationViewController?.setViewControllers(newMasterViewControllers, animated: false)
    detailNavigationController.setViewControllers(newDetailViewControllers, animated: false)
    return detailNavigationController
}