ios - pushViewController with scaling animation, that shows background -

i have finding way call pushviewcontroller scaling animation, facebook iphone app main menu icon click animation. (new viewcontroller popup center, , scales original size.)

i searched several way change animation of pushviewcontroller.

first, tried this:

viewcontroller.view.transform = cgaffinetransformmakescale(0.5f, 0.5f); [uiview animatewithduration:0.5f animations:^{      viewcontroller.view.transform = cgaffinetransformmakescale(1.0f, 1.0f); }]; [self.navigationcontroller pushviewcontroller:viewcontroller animated:no]; 

but there problem, old viewcontroller disappeared when animation starts, there's white background.

if use catransition change animation, can show both old & new viewcontroller both, there's no scaling animation, move in, push in, fade in animations.

i want show both new & old view controller catransition animations, , need way implement custom animation.

here last suggestion, dirty way:

[self.view addsubview:viewcontroller.view]; viewcontroller.view.transform = cgaffinetransformmakescale(0.5f, 0.5f); [uiview animatewithduration:0.5f                       delay:0.0f                     options:uiviewanimationcurveeaseinout                  animations:^{     viewcontroller.view.alpha = 1.0f;     viewcontroller.view.transform = cgaffinetransformmakescale(1.0f, 1.0f);  } completion:^(bool finished) {     [self.navigationcontroller pushviewcontroller:viewcontroller animated:no];     [viewcontroller release]; }]; 

first, added new viewcontroller.view subview, can show animation new & old view both. when animation ended, pushviewcontroller later.

this way can implement thought, think dirty way, , there's remain problem:

navigation bar items not change immediately, changed after animation ends.

is there simple, clear way implement animation? think impossible without change original implentation of pushviewcontroller, should subclassing pushviewcontroller?

thanks read, , help.

i don't think animation done view controller. can keep existing view controller. create new uiview supposed zoom in. add new uiview existing view controller , apply animation it.