iOS using protocols and closing modally presented view controller

Question

I have Navigation controller and a ViewController. let's call it MainVC. Now I am opening some ViewControllers in following way

MainVC --(Modally presented)---> VC1 ---(Modally presents)->>VC2

Now VC2 gets some data and throws it data in below given way to VC1

if let del = self.delegate{
             //Closing Current view controller 
            self.dismiss(animated: true, completion: nil) 
            del.onDataSuccessfullyFetched()


        }

However the Protocol is defined as

protocol DelegateOnDialogDismiss {

    func onDataSuccessfullyFetched()

}

Similarly VC1 Throws its data back to MainVC and gets dismissed like shown in above code. And then delegated method in MainVC pushes a new viewController to NavigationView like so ...

let popOverHouseHoldInfo = UIStoryboard(name: "Main",bundle: nil).instantiateViewController(withIdentifier: "idHouseHoldInfoVC") as! HouseHoldInfoViewController
                  self.navigationController?.pushViewController(popOverHouseHoldInfo, animated: true)

Problem:

The MainVC is calling that function to push new ViewController in NavigationView but it is not getting happen. I do not know why. But everything is working as expected until the delegates tries to Push newViewController but failed.

My assessment: I think the main culprit is following line as we are dismissing Modally presented viewControllers :

self.dismiss(animated: true, completion: nil)

Please help me. I do not know what is the main problem in this workflow.

(1) Are VC1 and VC2 both getting dismissed? (2) Does `self.navigationController?` return `nil` or a `UINavigationController`? — Aaron Brager, Jul 22 '19 at 13:13
yes both are getting dismiss. When VC2 throws results back VC2 dismiss it self and then the VC1 throws data back to MainVC and VC1 Gets dismiss too — A.s.ALI, Jul 22 '19 at 13:35
OK, set a breakpoint and check if `self.navigationController?` is nil. If not, you might be calling on a background thread. — Aaron Brager, Jul 22 '19 at 13:39
i made a delay in VC1. after dismissing vc1 I am calling delegated method with delay. and everything work as expected — A.s.ALI, Jul 22 '19 at 13:45
sounds like you should put the code in the `completion:` handler — Aaron Brager, Jul 23 '19 at 03:24

iOS using protocols and closing modally presented view controller

0 Answers0