Working implementation of slide up/down transition using UINavigationControllerDelegate on iOS7
问题 I've been spending some time trying to sort out custom transition animations available in iOS 7. According to this question, UINavigationControllerDelegate is the way to go. There are, however, no examples or documentation describing how best to approach a simple vertical transition in iOS7. (There are a plethora of other transition styles using UINavigationControllerDelegate, but none as simple as sliding the view up and down -- there are others that suggest just modifying the view position,