uiviewcontroller - dismissViewControllerAnimated:completion: on iOS 8 -

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in ios <= 7, directly after calling dismissviewcontrolleranimated:completion: result in presentedviewcontroller being nil. in ios 8, presentedviewcontroller still points presented viewcontroller, right until completion block executed.

[self dismissviewcontrolleranimated:no completion:^{     //self.presentedviewcontroller nil }]; //self.presentedviewcontroller nil on ios 7, not nil on ios 8

so in ios 8 cannot rely on property presentedviewcontroller in order find out viewcontroller top visible viewcontroller.

in ios 8, alerts need presented onto viewcontroller (which poses problem). not show if viewcontroller try present on presents viewcontroller.

if dismissed presented viewcontroller , show uialertcontroller on top visible viewcontroller (by recursively searching last presentedviewcontroller), of course not show log error message: "warning: attempt present on view not in window hierarchy!"

  1. is bug in ios 8 or new way?
  2. how can find out viewcontroller can present uialertcontroller on?

i found workaround find out viewcontroller can present alert upon:

@implementation uiviewcontroller (visibleviewcontroller)  - (uiviewcontroller *)my_visibleviewcontroller {      if ([self iskindofclass:[uinavigationcontroller class]]) {         // not use method visibleviewcontroller presentedviewcontroller beingdismissed         return [[(uinavigationcontroller *)self topviewcontroller] my_visibleviewcontroller];     }      if ([self iskindofclass:[uitabbarcontroller class]]) {         return [[(uitabbarcontroller *)self selectedviewcontroller] my_visibleviewcontroller];     }      if (self.presentedviewcontroller == nil || self.presentedviewcontroller.isbeingdismissed) {         return self;     }      return [self.presentedviewcontroller my_visibleviewcontroller]; }  @end  // show uialertcontroller, present on following viewcontroller: uiviewcontroller *visibleviewcontroller = [[uiapplication sharedapplication].delegate.window.rootviewcontroller my_visibleviewcontroller];

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