How to animate when no reference to target view?

Hi,

In my iOS5 app for iPhone, I have something like this

AppDelegate
ivar ViewController1
ivar ViewController2


ViewController1
ivar view1
ivar button1
IBAction animateToView


ViewController2
ivar view2


Now I want to animate from view1 from viewcontroller1 to view2 from viewcontroller2 by pushing a button in viewcontroller1.
Bu I do not have a reference to the view2 to the viewcontroller2 in viewcontroler1.

If I hook the button to an action/target and use block based animation in it
this one >>

[UIView transitionFromView:<#(UIView *)#>
toView:<#(UIView *)#>
duration:<#(NSTimeInterval)#>
options:<#(UIViewAnimationOptions)#>
completion:<#^(BOOL finished)completion#>]

Click to expand...

I am unable to fill in the toView: because of those missing references.

What would you recommend? IS it even good to solve thi by action target?

Thanks.