CODEWITHSUNDEEP
iosobjective-cswiftstoryboard
vaibhav
vaibhav

Reputation: 4096

Push segue animation not working

I am working in a app which is coded in Objective (only one class) and rest of the app written in Swift. In my app i have 3 storyboards and these storyboards have their viewControllers accordingly.

Issue: Sometimes i change the rootViewController using beow code, the push segues animation stop working after that.

// constant to share globally 
let kApplicationDelegate = UIApplication.shared.delegate as? AppDelegate

let controller = UIStoryboard().getControllerInstance(storyBoardName: "Autograph", identifire: "loginSuccessVC")
kApplicationDelegate?.window?.rootViewController = controller

Upvotes: 1

Views: 903

Answers (2)

Randika Vishman
Randika Vishman

Reputation: 8134

How to do Push Segue Transition Properly

I know it's bit late to reply for this Question! But better late than Never!

First things First:
For Push transition to work properly, you have to have UINavigationController hosting your current ViewController as the rootViewController. What the heck does that mean?

Example:
There are two or many ViewControllers (here onwards ViewController == VC) A, B, and more. If you are currently in VC A and you want to move to VC B doing a Push (or Detail) transition on a button action in VC A, then remember your VC A has to be the RootViewController of a UINavigationController.

[  UI         ]                          [     ]            [     ]
[  Navigation ]-- RootViewController ==O>[  A  ]--- Push -->[  B  ] 
[  Controller ]                          [     ]            [     ]

Otherwise it doesn't work. It would appear as a Present Modally transition.

So far there are two ways I have recongised to achieve this. One is pure programmatically, the other is using StoryBoard and Code hand in hand.

Programmatically:
For the ease of explaining I would embed my UINavigationController at the beginning of the UIViewController stack. In order to achieve this, we have to do a small alteration to AppDelegate's didFinishLaunchingWithOptions launchOptions method. It should look like following:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    window = UIWindow(frame: UIScreen.main.bounds)
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let initialVCIdentifier = "AViewController" // A ViewController **
    let firstVC = storyboard.instantiateViewController(withIdentifier: initialVCIdentifier)
    let nav = UINavigationController(rootViewController: firstVC) // Assigning the A VC as the RootViewController of the NavigationController
    window?.rootViewController = nav  // Look for the *** Note bellow
    window?.makeKeyAndVisible()

    return true
}

** You have to denote the ViewController Identifier for A VC within the InterfaceBuilder. And I assume that your storyboard name is Main.storyboard.
*** If you are not doing this for initial View controller, just present this UINavigationController as a modal VC within your VC workflow path

In the action for the button in VC A, it should look like following: 

@IBAction func TestBtnAct(_ sender: Any) {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let vc = storyboard.instantiateViewController(withIdentifier: "BViewController") as UIViewController
    navigationController?.pushViewController(vc, animated: true)
}

That's it! I think if you have tried it out as I've mentioned above, it should do the magic already.

Storyboard and Code hand-in-hand:
This means your VC A is already being hosted by a UINavigationController within the storyboard design. In this case you don't need to programmatically create the UINavigationController and embed the VC A as the RootViewController. Just having the above Button action might be sufficient.

Hope this would be helpful to someone out there. And here is a sample project I have done and uploaded in GitHub for learning purposes of all of yours.

Cheers!

Upvotes: 3

Aravind A R
Aravind A R

Reputation: 2714

When you are changing the rootViewController try setting the navigationController as the root rather than the navigationController's rootViewController .

Say you have a viewController let's name it VCA is the rootViewController of a UINavigationController Nav1. Then instead of making VCA as rootViewController of kApplicationDelegate?.window?. Try making Nav1 as the rootViewController of kApplicationDelegate?.window?. 

kApplicationDelegate?.window?.rootViewController = Nav1

The animation is not working because it may not a push that's occurring. The self.navigationController of the ViewController from where you are pushing might be nil.

Upvotes: 2

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