iphone : Switching views like a picture book, problem with removeFromSuperView - iphone

Question

Right I know how to do the pictue book effect but I struggling to remove the view
So page 1, I add the second page view via addSubview (via a swipe). I also increment a counter so I know what page I am on.
So how do I return to page 1? See I thought it would be self.view removeFromSuperview but that crashes when you try to go back to page 2
Code below
- (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
//NSLog(#"swipe right to left");
UniversalAppAppDelegate *appDelegate = (UniversalAppAppDelegate *)[[UIApplication sharedApplication] delegate];
PictureBookViewController *viewController2 =(PictureBookViewController *) [appDelegate getViewControllerForViewID:#"81"];
[UIView beginAnimations:Nil context:nil];
[UIView setAnimationDuration:0.6];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view.superview cache:YES];
self.viewController = viewController2;
self.viewController.pageNo = self.pageNo + 1;
[self.view addSubview:self.viewController.view];
[UIView commitAnimations];
[viewController2 release];
} else {
//NSLog(#"swipe left to right");
NSLog([NSString stringWithFormat:#"%d", self.pageNo]);
if (self.pageNo > 0) {
[UIView beginAnimations:Nil context:nil];
[UIView setAnimationDuration:0.6];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view.superview cache:YES];
//self.viewController = viewController2;
//self.viewController.pageNo = self.pageNo - 1;
//[self.view addSubview:self.viewController.view];
[self.view removeFromSuperview];
//[self.view addSubview:self.viewController.view];
[UIView commitAnimations];
}
}
}
Update:
Each view has its own view controllers.

Answer 1

You want to remove your viewController's view, not the container's view.
[self.viewController.view removeFromSuperview];

Answer 2

This seems to work and not crash? I am now convinced it right. I just seem to need a way of removing the last added subview. My first view is not the superview
- (void)handleSwipeFrom:(UISwipeGestureRecognizer *)recognizer {
if (recognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
//NSLog(#"swipe right to left");
UniversalAppAppDelegate *appDelegate = (UniversalAppAppDelegate *)[[UIApplication sharedApplication] delegate];
PictureBookViewController *viewController2 =(PictureBookViewController *) [appDelegate getViewControllerForViewID:#"82"];
[UIView beginAnimations:Nil context:nil];
[UIView setAnimationDuration:0.6];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlUp forView:self.view.superview cache:YES];
self.viewController = viewController2;
self.viewController.pageNo = self.pageNo + 1;
self.viewController.lastViewController = self;
[self.view addSubview:self.viewController.view];
[UIView commitAnimations];
[viewController2 release];
} else {
//NSLog(#"swipe left to right");
NSLog([NSString stringWithFormat:#"%d", self.pageNo]);
if (self.pageNo > 0) {
[UIView beginAnimations:Nil context:nil];
[UIView setAnimationDuration:0.6];
[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown forView:self.view.superview cache:YES];
self.pageNo --;
self.view = self.viewController.view;
[self.view removeFromSuperview ];
self.view = self.lastViewController.view;
[UIView commitAnimations];
}
}
}