ios - Custom ViewController Transitions: Get ToViewController's Subview's Frame -

here's illustration of question:

i have starimageviews in viewcontrollers & b displays same image have different frames each other in viewcontroller.

when starimageview in viewcontroller tapped, app pushes new view controller navigation controller stack , @ same time, animates final frame in viewcontroller b.

this behaviour transition in iphone photos app.

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how i'm doing now

i initialise temp uiimageview in animator object initial starimageview's frame , image in viewcontroller a, , animate final frame hard-coding rect cgrectmake(0, 60+44, containerview.bounds.size.width, containerview.bounds.size.width) (frame of starimageview in viewcontroller b), , removing temp uiimageview superview in animation completion block.

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how wish instead

the project created in storyboard autolayout enabled. wish frame of starimageview in viewcontroller b during transition rather hard-coding above. due viewcontorller lifecycle, unable reference subviews in viewcontroller b in animator object haven't been initialised yet.

are there other solutions or best practices such situations? in advance!

p.s. i've seen this, this, , this no luck in answer.

[toviewcontroller.view layoutifneeded];