How to automatically call a method after popping a view controller off the stack on the iPhone
iphone, model-view-controller, stack, uiview, view
Solution
I just resolved this self same problem - and the answers above are almost correct, they just forgot about setting the delegate.
I have a root view controller that displays the size of a list, calls a child view controller that may alter the size of a list, and must update the size upon return.
When I create my parent view (SettingsView below), and add it as the root view of a UINavigationController, I make sure to set the UINavigationController's delegate before I display the view - that's the key part:
SettingsView *sv = [[SettingsView alloc] initWithNibName:@"SettingsView" bundle:nil];
UINavigationController *nc = [[UINavigationController alloc] initWithRootViewController:sv];
[nc setDelegate:sv];
In the parent view, implement the UINavigationControllerDelegate protocol:
@interface SettingsView : UIViewController <UINavigationControllerDelegate>
and provide the willShowViewController method:
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
// Your code to update the parent view
}
This is called after the child view is dismissed, and before the parent view is redisplayed.
Problem
I need to update the parent view on an iPhone after popping a child view off the navigation stack. How can I setup the parent view to be notified or receive an automatic method call when the child is popped off the stack and the parent becomes visible again? The user enters data on the child page that I want to display on the parent page after the user is done and pops the view. Thanks for you help!