Swift - pushViewController from appDelegate, rootViewController.navigationController is nil
Solution 1
It seems that rootViewController actually is of type UINavigationController in my case, so casting it on declaration allowed me to call pushToViewController directly on it.
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String, annotation: AnyObject?) -> Bool {
let rootViewController = self.window!.rootViewController as! UINavigationController
let mainStoryboard = UIStoryboard(name: "Main", bundle: nil)
let profileViewController = mainStoryboard.instantiateViewController(withIdentifier: "InstructionVC") as! InstructionVC
rootViewController.pushViewController(profileViewController, animated: true)
return true
}
Solution 2
SWIFT 4: Safe way to push with the use of conditional binding and Chaining
if let navController = self.navigationController, let viewController = self.storyboard?.instantiateViewController(withIdentifier: "indentfier") as? CustomViewController{
navController.pushViewController(viewController, animated: true)
}
In One line of code :
Swift 3:
self.navigationController!.pushViewController(self.storyboard!.instantiateViewController(withIdentifier: "view2") as UIViewController, animated: true)
self.navigationController!.pushViewController(self.storyboard!.instantiateViewControllerWithIdentifier("view2") as UIViewController, animated: true)
Solution 3
APPDELEGATE TO PAGE:
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let loginPageView = mainStoryboard.instantiateViewControllerWithIdentifier("leadBidderPagerID") as! LeadBidderPage
var rootViewController = self.window!.rootViewController as! UINavigationController
rootViewController.pushViewController(loginPageView, animated: true)
PAGE TO PAGE:
let loginPageView = self.storyboard?.instantiateViewControllerWithIdentifier("scoutPageID") as! ScoutPage
self.navigationController?.pushViewController(loginPageView, animated: true)
Solution 4
Swift 3 & 4 best practices to push viewcontroller from AppDelegate:
if let rootViewController = self.window!.rootViewController as? UINavigationController {
let storyboard = UIStoryboard(name: "Main", bundle: nil)
if let viewcontroller = storyboard.instantiateViewController(withIdentifier: "DiscussionBoardSID") as? DiscussionBoardViewController {
viewcontroller.postID = "13" ///pass data to your viewcontroller
rootViewController.pushViewController(viewcontroller, animated: true)
}
}
Solution 5
Updated for swift 3/4. The most voted "one line of code" doesn't work because there's no navigation controller in "self"
let rootViewController = self.window!.rootViewController as!
UINavigationController
let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let profileViewController = mainStoryboard.instantiateViewController(withIdentifier: "ProfileViewController") as! ProfileViewController
rootViewController.pushViewController(profileViewController, animated: true)
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tehfailsafe
Updated on July 09, 2022Comments
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tehfailsafe almost 2 years
Having a problem following a few guides, specifically http://blog.originate.com/blog/2014/04/22/deeplinking-in-ios/
I'm setting the url scheme and it's working well to launch the app from another app, but passing in the host or url are not working as it seems it should. I'm using storyboards and interface builder for all the view layouts.
The guide shows this openURL in appDelegate:
-(BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation{ if([[url host] isEqualToString:@"page"]){ if([[url path] isEqualToString:@"/page1"]){ [self.mainController pushViewController:[[Page1ViewController alloc] init] animated:YES]; } return YES; } }
Here is my version simplified and in swift from a few other sources, ie Get Instance Of ViewController From AppDelegate In Swift I'm skipping the conditional for the url host at the moment to remove potential other variables in the problem.
func application(application: UIApplication, openURL url: NSURL, sourceApplication: String, annotation: AnyObject?) -> Bool { var rootViewController = self.window!.rootViewController let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil) var profileViewController = mainStoryboard.instantiateViewControllerWithIdentifier("profile") as ProfileViewController rootViewController.navigationController.popToViewController(profileViewController, animated: true) return true }
The swift version causes a crash:
fatal error: unexpectedly found nil while unwrapping an Optional value
It seems that rootViewController doesn't have a navigationController yet?
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nswamy almost 9 yearsSwift 2.0
self.navigationController!.pushViewController(self.storyboard?.instantiateViewControllerWithIdentifier("view2") as! UIViewController, animated: true)
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Jared over 8 yearsI know this has been up for a year but i was wondering, if you push to a new view controller you instantiated, does this count as a segue where you can prepareforsegue?
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Michael Yaworski almost 8 yearsThis was the only helpful post I saw in hours. Thanks. Page-to-page was what I was looking for.
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Sayalee Pote almost 7 yearsSwift 3.0 self.navigationController!.pushViewController(self.storyboard!.instantiateViewController(withIdentifier: "view2") as UIViewController, animated: true)
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Rishabh Dugar over 6 yearsI dont find window in your solutin
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Jeremy over 6 years@RishabhDugar Are you in AppDelegate class?
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Rishabh Dugar over 6 yearsNo I am in my Controller File
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Jeremy over 6 yearsThe solution is for getting the navigation controller from app delegate, not for view controller. In your case, the "one line of code" solution above might be what will work for you.
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lapin about 6 yearsSignal SIGABRT on line rootViewController
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Umit Kaya over 5 yearsself.navigationController is nil. how you push?
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Kumar KL over 5 years@Umitk PushViewController is a part of Navigation API. So without 'UINavigationController' you cont push any. Updated answer to safest way to handle the push
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bruth over 3 yearsThank you thank you thank you. Was following some guides that were just grabbing the nav controller from the storyboard and it just wasn't working and this was the trick!