iOS7 Custom ViewController transition and Top Layout Guide

Question

I implemented a custom UIViewController Transition in my App, which replaces the navigation controllers built in push animation.

Everything works so far, except the topl

Answer 1

I ran into the exact same problem. My custom navigation controller's container view didn't have constraints. The minute I added vertical spacing constraints from the container view to its superview's layout guides (albeit the two were identical in size), and set the top/bottom/status bar appearance on the container view everything was ok and the layout guides of the pushed controllers were in the correct position. Hope that helps.

Update: From the official documentation on topLayoutGuide

A view controller within a container view controller does not set this property's value. Instead, the container view controller constrains the value to indicate: The bottom of the navigation bar, if a navigation bar is visible The bottom of the status bar, if only a status bar is visible The top edge of the view controller’s view, if neither a status bar nor navigation bar is visible

So the container view needs to implement correct constraints and hide/show bars and such for the effects to work. AFAIK there is no API to do this in custom container view controllers.