How to I instantiate multiple View Controllers from AppDelegate? - ios

Question

There is a container view which holds 3 view controllers (V1, V2 and V3). I'm able to switch from A, B or C by swiping left or right. Both A or B contain their own collection view. If I tap on any cell in the collection view inside A or B, the PlayerVC (named Player in the pic above ^^) launches and a video begins to play using AVPlayer.
The problem is: Since I am using universal links the user goes straight to the playerView to play a video but when they press the done button the app crashes. The issue I beleive is because the rest on the view controllers are NOT initialized? How do I initialize the container view and the other view controllers? Or if this is not the issue please let me know what the problem is.
Here is the app delegate with some sample code. Please provide code if possible to help out!
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
if let pagingViewController = window?.rootViewController as? PagingViewController {
pagingViewController.videoPlaybackManager = videoPlaybackManager
}
return true
}
class AppDelegate: UIResponder, UIApplicationDelegate {
// Other App Delegate methods.....
func application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: #escaping ([Any]?) -> Void) -> Bool {
// 1) Make sure the passed `user activity` has expected characteristics.
guard userActivity.activityType == NSUserActivityTypeBrowsingWeb, let url = userActivity.webpageURL else {
return false
}
// HELP: I need to get to `PlayerVC` from here?
return true
// If we can't do the above we default to opening the page in safari
}
}
EDIT - Additional code of how I am instantiating the 3 VCs inside PagingViewController ( container View)
private func setupViewControllers() {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
page1 = storyboard.instantiateViewController(withIdentifier: StoryboardIdentifiers.feedViewController.rawValue) as! FeedViewController
page1.view.translatesAutoresizingMaskIntoConstraints = false
page1.delegate = self
scrollView.addSubview(page1.view)
addChildViewController(page1)
page1.didMove(toParentViewController: self)
// Inject dependency.
page1.videoPlaybackManager = videoPlaybackManager
page2 = storyboard.instantiateViewController(withIdentifier: StoryboardIdentifiers.favoritesViewController.rawValue) as! FavoritesViewController
page2.view.translatesAutoresizingMaskIntoConstraints = false
page2.delegate = self
scrollView.addSubview(page2.view)
addChildViewController(page2)
page2.didMove(toParentViewController: self)
page3 = storyboard.instantiateViewController(withIdentifier: StoryboardIdentifiers.settingsViewController.rawValue) as! SettingsViewController
page3.view.translatesAutoresizingMaskIntoConstraints = false
scrollView.addSubview(page3.view)
addChildViewController(page3)
page3.didMove(toParentViewController: self)
......

Answer 1

If you are dealing with UIPageViewController, to set the proper child UIViewController you can:
// In PagingViewController
func loadChildViewControllerFromUniversalLink(myParameter: Bool) {
// The condition you need to satisfied in order to present
// the correct child view controller
if myParameter { // is satisfied
let universalLinkVc = MyChildViewController() // load your VC here
let direction : UIPageViewControllerNavigationDirection = .forward // or .reverse, as you wish
self.setViewControllers([universalLinkVc], direction: direction, animated: animated, completion: nil)
}
}
And then in your AppDelegate's application(_ application: UIApplication, continue userActivity: NSUserActivity, restorationHandler: #escaping ([Any]?) -> Void) -> Bool:
myPagingViewControllerInstance.loadChildViewControllerFromUniversalLink(true)