Custom segue, scaling out the source view controller - ios

Question

Attempting to write a custom segue where the source view is scaled out, while changing the alpha of the destination to fade the destination in. The destination is a MKMapView, so I want it updating as the fade occurs.
With what I've tried I end up with the source and designation scaling out simultaneously, and I can't get just the source view to scale out.
class Map_Segue: UIStoryboardSegue {
override func perform()
{
var sourceViewController : UIViewController = self.sourceViewController as UIViewController
var destinationViewController : UIViewController = self.destinationViewController as UIViewController
destinationViewController.view.alpha = 0 sourceViewController.addChildViewController(destinationViewController) sourceViewController.view.addSubview(destinationViewController.view)
UIView.animateWithDuration(2.0,delay:1.0,options: UIViewAnimationOptions.CurveEaseInOut, // delay of 1 second for aesthetics
animations:
{
sourceViewController.view.transform = CGAffineTransformScale(sourceViewController.view.transform, 100.0, 100.0);
destinationViewController.view.alpha = 1;
},
completion:
{ (finished:Bool)->Void in
destinationViewController.didMoveToParentViewController(sourceViewController);
}
)
}
}
I've tried autoresizesSubviews=false, but that doesn't seem to do anything.
I've tried setting the destination transform in the animation to be 1/100 (and set the options to UIViewAnimationOptions.CurveLinear which has the final result correct, but the transition effect is wrong (map in the background scaled up then down again)
I'm sure this should be easy, and I'm missing a trick as I'm new to this.
Anyone got any ideas?
Update:
I've found that (somewhat obviously) I should use sourceViewController.view.superview?.insertSubview( destinationViewController.view, atIndex:0) to insert it alongside the original source view, rather than as a child of it, that way, obviously, the transform is independent, not with respect to the views parent (which it will be as a subview). The problem then is swapping to the new view. Using the method I had, viewWillAppear and similar are not called, and the changing over the views does not work. If I call presentViewController, then we get a glitch when viewWillAppear is called.
Solution so far
Forget using custom segues. Followed the suggestion and placed a UIImageView on top of the map view, and had a beautiful animating fade in about 5 minutes of coding.

Answer 1

I think you are a bit confused with parent and child view controllers etc. It is sufficient to temporarily add the second view controller's view to the first one, perform the transitions and then clean up.
I tested the following in a simple sample project. Note that I am adding the second view controller's view to the window rather than the first view controller's view because otherwise it would also get scaled up.
override func perform() {
let first = self.sourceViewController as ViewController
let second = self.destinationViewController as ViewController
second.view.alpha = 0
first.view.window!.addSubview(second.view)
UIView.animateWithDuration(2.0, delay: 0.0,
options: .CurveEaseInOut, animations: { () -> Void in
first.view.transform = CGAffineTransformMakeScale(100.0, 100.0)
second.view.alpha = 1.0
})
{ (finished: Bool) -> Void in
second.view.removeFromSuperview()
first.presentViewController(second, animated: false, completion: nil)
}
}