Navigate to a Specific view on click on a push notification with Reveal

Question

I want to navigate to a specific viewcontroller when the I click on a push notification.

I have written this code in my didReceiveRemoteNotification method.

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        let vc = storyboard.instantiateViewController(withIdentifier: "deals") as! FYIDealsVC
        let naviVC:UINavigationController? = self.window?.rootViewController?.revealViewController().frontViewController as? UINavigationController
        naviVC?.pushViewController(vc, animated: true)
}

But it's giving me this error which crashes the app.

fatal error: unexpectedly found nil while unwrapping an Optional value

There are many posts with navigation controller or just presenting the viewcontroller. But I want to navigate to the specific view with reveal.

Any help would be highly appreciated.

Are you sure that the storyboard ID of the given screen is "deals" and that it has the class `FYIDealsVC`? — Tamás Sengel, Aug 29 '17 at 09:04
Yes, in this line only it breaks down let naviVC:UINavigationController? = self.window?.rootViewController?.revealViewController().frontViewController as? UINavigationController — NavodaP, Aug 29 '17 at 09:08
are you sure you are getting object of navigation controller debug this line i think you are getting nil in this line self.window?.rootViewController?.revealViewController().frontViewController as? UINavigationController — Pushpendra, Aug 29 '17 at 09:11
i have another solution for this try with window.rootviewcontroller or you can use notificationcenter to navigate — Pushpendra, Aug 29 '17 at 09:21

score 2 · Accepted Answer · answered Aug 29 '17 at 09:45

2

here is a another solution for this Try this:-

First Option :-

    let storyboard = UIStoryboard(name: "Main", bundle: nil)
     let vc = storyboard.instantiateViewController(withIdentifier: 
    "deals") as! FYIDealsVC

  // setup revelview controller and root with window 

    self.window?.rootViewController = //object of revelViewController
    self.window?.makeKeyAndVisible()

Second option :-

 //  in Landing Screen from where you can easily navigate to the target 
  viewcontroller :-

in Landing VC:-

   viewdidload:- 
            NotificationCenter.default.addObserver(self, selector: 
    #selector(self.navigationForNotification(notification:)), name: 
   NSNotification.Name(rawValue:PushNavigationIdentifier), object: nil)


// Selector Method :-

 func navigationForNotification(notification:Notification) {
  let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: 
 "deals") as! FYIDealsVC
 self.navigationController?.pushViewController(vc, animated: true)  
}


 in appDelegate :- 
   func application(_ application: UIApplication, 
   didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
                  NotificationCenter.default.post(name: 
   NSNotification.Name(PushNavigationIdentifier), object: userInfo)

   }

answered Aug 29 '17 at 09:45

Pushpendra

976
6
13

Hi thanks for the answers. The first one doesn't seem to work and regarding the second, it's working . But you can add observer to only one class. Otherwise it will be called multiple times. I need it be called in every class. – NavodaP Aug 29 '17 at 11:05
define only in landing screen and make sure observer should add only once .set a bool with userdefault change the value when observer added. – Pushpendra Aug 29 '17 at 11:14
yeah, but if the user is in another class , that class fails to catch that notification and do the function required. I want whatever the class catch the notification , but execute the required function just once. – NavodaP Aug 29 '17 at 11:34
are you using SWrevelvc ? – Pushpendra Aug 29 '17 at 11:59
Actually the prob exists with me too. Even if I am adding NotificationCenter on the basecontroller then in that case it is calling but unable to navigate to the next screen when App in in active state, for this what I have done I have added the observer for every screen and removed the observer from ViewWillDisappear. But if it is background then it was working fine. – Prakash Aug 29 '17 at 12:11
is target screen is added on side menu.you are accessing FYIDealsVC screen from side menu. – Pushpendra Aug 29 '17 at 12:15
if you are switching view from side menu then follow this link to change programatically viewcontroller https://stackoverflow.com/questions/21096326/swrevealviewcontroller-manually-switch-to-another-view – Pushpendra Aug 29 '17 at 12:21
Hi, the NotificationCenter approach worked for me along with @Prakash's answer. I have added a base view controller. With that I could add and remove notification observers in ViewDidApppear and ViewWillDisappear methods to all the classes. Thanks a lot! – NavodaP Aug 30 '17 at 05:43
@NavodaP we are here to help and guide each other. It's a part of programming. – Prakash Aug 30 '17 at 07:57

score 0 · Answer 2 · answered Aug 29 '17 at 09:26

0

Looks like error happens when you force unwrap FYIDealsVC. Can you use

let vc = FYIDealsVC()

instead of

let vc = storyboard.instantiateViewController(withIdentifier: "deals") as! FYIDealsVC

answered Aug 29 '17 at 09:26

Stacy Smith

490
5
11

Navigate to a Specific view on click on a push notification with Reveal

2 Answers2