ios - performSegueWithIdentifier not working when being called from new instance of viewController in Swift -

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my mission

when app receive notification , user taps on notification want redirect user correct view. in case, singleapplicationviewcontroller.

current code

pushnotification.swift - class static functions handle behaviors when receiving push notifications

the __getnavigationcontroller returns specific navigationcontroller based on tab -and viewindex tabbarcontroller.

internal static func __getnavigationcontroller(tabindex: int, viewindex: int) -> uinavigationcontroller {         let appdelegate = uiapplication.sharedapplication().delegate as! appdelegate          let window:uiwindow? = (uiapplication.sharedapplication().delegate?.window)!         let storyboard = uistoryboard(name: "main", bundle: nil)         let viewcontroller = storyboard.instantiateviewcontrollerwithidentifier("mainentry")         window?.rootviewcontroller = viewcontroller          let rootviewcontroller = appdelegate.window!.rootviewcontroller as! uitabbarcontroller         rootviewcontroller.selectedindex = tabindex         let nav = rootviewcontroller.viewcontrollers![viewindex] as! uinavigationcontroller          return nav     }

the applicationclicked being called when user click on notification , method calls on __getapplication fetch application db objectid received in push notification , instantiate grouptableviewcontroller perform segue singleapplicationviewcontroller. 

(tabbarcontroller -> navigation controller -> grouptableviewcontroller -> singleapplicationviewcontroller)

what bit strange when set tabindex 0 , viewindex 1. groupview on second tab (tab 1) , view controller should first (0). when set them corresponding numbers, receive nil , application crashes.

i read force view controller load when doing _ = grouptableviewcontroller.view , does. when being called, viewdidload -function being called.

/************** application ***************/     static func applicationclicked(objectid: string) {         __getapplication(objectid) { (application, error) in             if application != nil && error == nil {                 let nav = __getnavigationcontroller(0, viewindex: 1)                 let grouptableviewcontroller = nav.viewcontrollers.first as! groupstableviewcontroller                 _ = grouptableviewcontroller.view                  grouptableviewcontroller.performseguewithidentifier("grouptabletoapplicationtodetailapplication", sender: application!)             } else {                 // hanlde error             }         }     }

grouptableviewcontroller.prepareforsegue()

here create new instance of applicationtableviewcontroller, middle step before getting singleapplicationviewcontroller

} else if segue.identifier == "grouptabletoapplicationtodetailapplication" {                 let navc = segue.destinationviewcontroller as! uinavigationcontroller                 let controller = navc.topviewcontroller as! applicationviewcontroller                 controller.performseguewithidentifier("applicationstosingleapplicationsegue", sender: sender as! application)             }

so, what's not working?

well, prepareforsegue in grouptableviewcontroller not being called. use the same code structure on timelineviewcontroller, , exact same code, when getting push notification , works perfectly. in case use tabindex 0 , viewindex 0 proper navigationcontroller.

please, thoughts and/or suggestions more welcome!

there change in following method..

internal static func __getnavigationcontroller(tabindex: int) -> uinavigationcontroller {         let appdelegate = uiapplication.sharedapplication().delegate as! appdelegate          let window:uiwindow? = (uiapplication.sharedapplication().delegate?.window)!         let storyboard = uistoryboard(name: "main", bundle: nil)         let viewcontroller = storyboard.instantiateviewcontrollerwithidentifier("mainentry")         window?.rootviewcontroller = viewcontroller          let rootviewcontroller = appdelegate.window!.rootviewcontroller as! uitabbarcontroller         rootviewcontroller.selectedindex = tabindex         let nav = rootviewcontroller.selectedviewcontroller as! uinavigationcontroller  //this return navigation controller..                         //no need of viewindex..          return nav     }

you have written 

let nav = rootviewcontroller.viewcontrollers![viewindex] as! uinavigationcontroller

change rootviewcontroller.selectedviewcontroller give uinavigationcontroller.

here navigavtion controller object..in applicationclicked method nav object might nil can not execute further performsegue code.

check following method.

/************** application ***************/     static func applicationclicked(objectid: string) {         __getapplication(objectid) { (application, error) in             if application != nil && error == nil {                 let nav = __getnavigationcontroller(0)//0 tab index..if want 1 replace  1                 let grouptableviewcontroller = nav.viewcontrollers.first as! groupstableviewcontroller  //rootview controller of nav controller                grouptableviewcontroller.performseguewithidentifier("grouptabletoapplicationtodetailapplication", sender: application!) //perform seque root vc...             } else {                 // hanlde error             }         }     }

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