Doorway Transition https://github.com/mkftr/DoorwayTransition
All I wrote for this effect is "MFDoorwayTransition" class. You can apply this effect easily in between two views like below :
MFDoorwayTransition *transition = [[MFDoorwayTransition alloc]
initWithBaseView:self.view
firstView:self.currentView
lastView:self.nextView];
[transition buildAnimation];
[transition release];
Doorway Transition is available under the MIT license. See the LICENSE file for more info.