ios - Presenting an alert from a view controller that has closed -


i have objectve c ios application in attempting show uialertcontroller, uiviewcontroller in process of closing. have tried adding common workaround in appdelegate:

- (uiviewcontroller *)currenttopviewcontroller {    uiviewcontroller *topvc = [[[[uiapplication sharedapplication] delegate] window] rootviewcontroller];    while (topvc.presentedviewcontroller)    {      topvc = topvc.presentedviewcontroller;    }   return topvc; }

called with:

[appdelegate.currenttopviewcontroller presentviewcontroller:alert animated:yes completion:nil];

however error still appearing:

warning: attempt present uialertcontroller on myviewcontroller view not in window hierarchy!

can advise?

if want display alert upon closing viewcontroller, can implement dismiss completion block , display there. example:

[self dismissviewcontrolleranimated:yes completion:^(void) {   // uialertcontroller code here  }];

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