UISplitViewControllerDelegate never called - ios

Question

I've been trying for days to get UISplitViewController to call the delegate. I tried setting it in the MasterViewController, I tried setting it in the DetailViewController, I tried having the SVC as an embedded view controller in a container inside another view controller, and use the prepareForSegue call to set the delegate. I tried instantiating it from the Storyboard in the AppDelegate and setting the delegate there. The delegate is never ever called. I'm going crazy.
I'm on the latest non-beta Swift (3.1), on iOS 10.3.1.
I've used the Debugger to check the delegate is in fact set, and remains in memory, however, the methods are never called.
I appreciate any help you can provide me with.
This is my current AppDelegate but I've tried countless ways as I said:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
Realm.Configuration.defaultConfiguration.deleteRealmIfMigrationNeeded = true
if let svc = self.window?.rootViewController as? UISplitViewController {
svc.delegate = svc.viewControllers.last as! UISplitViewControllerDelegate
}
return true
}
Edit 1:
Some of you didn't understand what delegate I'm trying to implement. To clarify, I'm trying to control the delegate of UISplitViewController, in other words, the UISplitViewControllerDelegate. The reason I'm trying to do this is to be able to control the collapsing of views. In the default configuration of the UISplitViewController, on an iPhone on portrait mode, it defaults to the detailViewController. This behavior is clearly wrong for most apps (and mine). I intend to first show the masterViewController that lists the content I have for display, and trigger the detailViewController only when an item has been selected.
I would also accept an answer that gave me some alternative way to have that behavior (prefer masterViewController on portrait unless my detailViewController has content set.
I know you can get the described behavior by not setting a detailViewController in the Storyboard, and using the showDetail segue when selecting an item, but my problem with that is I can't have a default view when no item has been selected, causing a grey square being shown (not very pretty) when in landscape on an iPad or iPhone Plus.

Answer 1

Please try below code it's work for me.
In AppDelegate:
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
let splitViewController = self.window!.rootViewController as! UISplitViewController
let navViewController = splitViewController.viewControllers.first as? UINavigationController
let masterVC = navViewController?.topViewController as? MasterViewController
let detailViewController = splitViewController.viewControllers.last as? DetailsViewController
masterVC?.delegate = detailViewController
return true
}
In MasterViewController
protocol MasterViewControllerDelegate : class{
func passingData(strName : String)
}
class MasterViewController: UITableViewController {
weak var delegate : MasterViewControllerDelegate?
override func viewDidLoad() {
super.viewDidLoad()
//Calling Delegate
delegate?.passingData(strName: "Any Message")
if let detailViewController = self.delegate as? DetailsViewController {
splitViewController?.showDetailViewController(detailViewController, sender: nil)
}
}
}
In DetailViewController
class DetailsViewController: UIViewController, MasterViewControllerDelegate{
//Other IBOutlet and Methods
//Delegate method of MasterViewControllerDelegate
func passingData(strName : String)
print(strName) //OUTPUT: "Any Message"
}
}
I hope it also work for you.