ios - How to obtain reference to a View Controller from UITabBarViewController -


edit: off base in approach. i'm trying pass data 1 vc another. source vc not controlled tab bar, can't reference destination vc through it. attempting reference destination vc thorough storyboard, data still nil on destination vc. i'm using core data , wish pass managedobjectcontext vc. here code:

......                     {                         try self.managedobjectcontext.save()                         appuserid = user.userid!                         } catch {                         fatalerror("error: \(error)")                     }                 }             }         self.passmanagedobjectcontext()     }      func passmanagedobjectcontext() {         let profiletableviewcontroller = uistoryboard(name: "profile", bundle: nil).instantiateviewcontroller(withidentifier: "profileviewcontroller") as! profiletableviewcontroller             profiletableviewcontroller.managedobjectcontext = self.managedobjectcontext         }   passing data appdelegate other viewcontrollers referencing tabbarviewcontrollers stack so:        let tabbarcontroller = window!.rootviewcontroller as! uitabbarcontroller         if let tabbarviewcontrollers = tabbarcontroller.viewcontrollers {             let profilenavcontroller = tabbarviewcontrollers[4] as! uinavigationcontroller             let profiletableviewcontroller = profilenavcontroller.topviewcontroller as! profiletableviewcontroller             profiletableviewcontroller.managedobjectcontext = context         }     } .....

end edit i'm trying same 1 viewcontroller accessed through tab bar (no segue). code above not recognize window!.rootviewcontroller how can reference root uitabbarcontroller?

uiviewcontroller has built-in optional property tabbarcontroller, inside view controller can access tabbarcontroller so:

if let tabbarcontroller = tabbarcontroller {     //get controller need     //tabbarcontroller.viewcontrollers     //and whatever need }

here current list of properties available in 'getting other related view controllers' section of apple's uiviewcontroller documentation:

uiviewcontroller: 'getting other related view controllers'


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