custom Segue correct way - ios

Question

Currently I try to work on a custom segue it should look like:
The [Destination View] should be behind the [Source View], this [Source View] should animate from 100% down to 0.1% and then remove, in the animation time the [Destination View] should also be there in background.
So you see the [Source View] become small in front of the [Destination View] and get removed.
This is my code:
import UIKit
class CustomSegueFromBigtoSmall: UIStoryboardSegue {
override func perform() {
let sourceVC = self.sourceViewController
let destinationVC = self.destinationViewController
sourceVC.view.addSubview(destinationVC.view)
UIView.animateWithDuration(0.5, delay: 0.0, options: .CurveEaseInOut, animations: { () -> Void in
sourceVC.view.transform = CGAffineTransformMakeScale(0.1, 0.1)
}){ (finished) -> Void in
destinationVC.view.removeFromSuperview()
let time = dispatch_time(DISPATCH_TIME_NOW, Int64(0.001 * Double(NSEC_PER_SEC)))
dispatch_after(time, dispatch_get_main_queue(), { () -> Void in
sourceVC.presentViewController(destinationVC, animated: false, completion: nil)
})
}
}
}
right now I see my [Source View], that instantly becomes my [Destination View]. The [Destination View] become small in front of a black background. Once it is "small" it simply appears as full screen.

Answer 1

The way I would do this in iOS 9 is to make this a presentation (modal) segue with a custom segue implementation. Your custom segue then simply calls super.perform() to do the actual presentation. But first, the segue sets itself as the destination's transitionDelegate and sets its presentation style to Custom. Now you're just doing an ordinary custom transition animation, with your own transitioning delegate and your own UIPresentationController, and you can do whatever you want, in good order.