How to execute method after removefromsuperview - objective-c

Question

I have a UIViewController (call it SubUIVC) that was loaded via my main UIViewController (call it MainUIVC) using my showNewView method and when I am done with the SubUIVC, I return to MainUIVC using my goBack method.
What I'd like to do is execute some code in MainUIVC once the goBack method is completed and my MainUIVC.view has been loaded.
Can anyone help me with doing this? Below are the two methods I made reference to above.
-(void) showNewView:(UIViewController*)showView{
UIView *currentView = self.view;
// get the the underlying UIWindow, or the view containing the current view
UIView *theWindow = [currentView superview];
UIView *newView = showView.view;
// remove the current view and replace with newView
[theWindow addSubview:newView];
// set up an animation for the transition between the views
CATransition *animation = [CATransition animation];
[animation setDuration:WIPE_ANIMATION_DURATION];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromRight];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[theWindow layer] addAnimation:animation forKey:#"SwitchToNewView"];
}
-(IBAction)goBack:(id)sender{
UIView *currentView = self.view;
// get the the underlying UIWindow, or the view containing the current view
UIView *theWindow = [currentView superview];
// remove the current view and replace with superview
[currentView removeFromSuperview];
// set up an animation for the transition between the views
CATransition *animation = [CATransition animation];
[animation setDuration:WIPE_ANIMATION_DURATION];
[animation setType:kCATransitionPush];
[animation setSubtype:kCATransitionFromLeft];
[animation setTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];
[[theWindow layer] addAnimation:animation forKey:#"SwitchToNewView"];
}

Answer 1

Have a BOOL property in the MainController than get's set by the goBack: function.
In the main controller's viewDidAppear:, check that BOOL to see if the view's just appeared as a result of goback: being called and do your thing. Obviously you should then reset that flag.