Animating a view & its subview separately - cocoa-touch

Question

I have a view interface which contains a subview touchWheel. On clicking a minimise button on interface I'd like to perform a transform & send the view to the bottom-right corner of my screen. The thing is that I want to "detach" the touchWheel view & send it to the corner separately with the parent-view, interface, following behind (& in fact fading out).
when I try this I encounter a problem. My animation works fine initially & touchWheel is sent towards the bottom corner, as desired. When touchWheel is about half-way to its destination I animate interface so that it follows touchWheel.
Once interface starts animating it appears to control touchWheel & touchWheel changes course.
It seems that interface still retains control of touchWheel since it's its parent view.
- (void)hideInterfaceButtonClicked : (id) sender
{
[[NSNotificationCenter defaultCenter] postNotificationName:#"RemoveGrey" object:self];
//Remove Views & transform
[touchWheel removeViews];
interfaceHidden = YES;
//Send Interface to corner
[UIView animateWithDuration:1.25
delay:0.0
options:UIViewAnimationCurveEaseIn
animations:^{
// Move to the right
CGAffineTransform translateInterface = CGAffineTransformMakeTranslation(437,200);
// Scale
CGAffineTransform scale = CGAffineTransformMakeScale(0.135,0.135);
// Apply them to the view
self.transform = CGAffineTransformConcat(scale, translateInterface);
self.alpha = 0.0;
} completion:^(BOOL finished) {
NSLog(#"Animation Has Stopped");
[[NSNotificationCenter defaultCenter] postNotificationName:#"hiddenInterfaceViewNeeded" object:self]; //after MoveView finishes
}];
}
Making touchWheel subview of something other than interface creates other problems which would complicate things further.
Any ideas how one might get around this issue? any tips greatly appreciated :)

Answer 1

You could do the following:
Move touchWheel to the interface's superview, recalculating its frame using convertRect:toView: so that touchWheel appears to have the same window coordinates.
Animate both the views to their final locations.
In the completion block of the animation do the opposite of step 1: make touchWheel a subview of interface, recalculating its frame again.
It doesn't seem too complicated, but there's a caveat: you may want to temporarily disable the maximize button (or whatever the appropriate control is) to prevent the maximize action during the animation. Otherwise, this approach will cause unpredictable results.