ios - Custom Transition Animation Causing Navigation Bar to Animate -

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i implementing custom transition animation between view controllers, reason navigation bar getting animated along transition animation. somehow auto layout issue? i'm not sure how be. here code using display , dismiss view controllers custom transition.

i navigation bar not animated, ideas why happening? 

-(void)animatetransition:(id<uiviewcontrollercontexttransitioning>)transitioncontext {     // grab , view controllers context     uiviewcontroller *fromviewcontroller = [transitioncontext viewcontrollerforkey:uitransitioncontextfromviewcontrollerkey];     uiviewcontroller *toviewcontroller = [transitioncontext viewcontrollerforkey:uitransitioncontexttoviewcontrollerkey];        if (self.presenting) {         fromviewcontroller.view.userinteractionenabled = no;          [transitioncontext.containerview addsubview:fromviewcontroller.view];         [transitioncontext.containerview addsubview:toviewcontroller.view];          int frameheight = fromviewcontroller.view.frame.size.height;         cgrect startframe = fromviewcontroller.view.frame;         startframe.origin.y = frameheight;         toviewcontroller.view.frame = startframe;          //create view same background color cover background on bounce effect         uiview *bottomcover = [[uiview alloc]initwithframe:cgrectmake(0, startframe.size.height-30, startframe.size.width, 30)];         [bottomcover setbackgroundcolor:[uicolor colorwithred:0.956 green:0.962 blue:0.956 alpha:1]];         [transitioncontext.containerview insertsubview:bottomcover belowsubview:toviewcontroller.view];          __block cgrect endframe = toviewcontroller.view.frame;         [uiview animatewithduration:[self transitionduration:transitioncontext] delay:0 usingspringwithdamping:.75 initialspringvelocity:1.0 options:uiviewanimationoptioncurveeasein animations:^{             endframe.origin.y = 0;             toviewcontroller.view.frame = endframe;         } completion:^(bool finished) {             [bottomcover removefromsuperview];             toviewcontroller.view.frame = endframe;             [transitioncontext completetransition:yes];         }];      }     else {         toviewcontroller.view.userinteractionenabled = yes;          [transitioncontext.containerview addsubview:toviewcontroller.view];         [transitioncontext.containerview addsubview:fromviewcontroller.view];          cgrect endframe = toviewcontroller.view.frame;         endframe.origin.y = 0;         fromviewcontroller.view.frame = endframe;           [uiview animatewithduration:[self transitionduration:transitioncontext] delay:0 usingspringwithdamping:.9 initialspringvelocity:1.0 options:uiviewanimationoptioncurveeasein animations:^{              int frameheight = toviewcontroller.view.frame.size.height;             cgrect startframe = fromviewcontroller.view.frame;             startframe.origin.y = frameheight;             fromviewcontroller.view.frame = startframe;          } completion:^(bool finished) {             [transitioncontext completetransition:yes];             //because there bug in xcode apparently.             [[uiapplication sharedapplication].keywindow addsubview:toviewcontroller.view];         }];      } }


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