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Hans Pinckaers

Custom action on Back Button UINavigationController

Yes! There is a way of using the backBarButton with a custom action. No, it’s not by overriding the backBarButton property of navigationItem. This is not an ugly solution with images that simulate the “Back”-button (arrow-shaped.) It’s possible to use the backBarButton for popping the current viewController as normal, but than with other animations such as UIViewAnimationTransitionCurlDown.

Enough said, the solution is simple. You have to subclass your navigationController’s  popViewControllerAnimated:(BOOL)animated. So create a custom navigationController:

customNavigationController.h

#import
@interface customNavigationController : UINavigationController {}
@end

And a custom “popViewControllerAnimated:(BOOL)animated”, this popViewControllerAnimated-function uses the “UIViewAnimationTransitionCurlDown” when popping from a SettingsTableView.

customNavigationController.m

#import "customNavigationController.h"
#import "SettingsTableController.h"
 
@implementation customNavigationController
 
- (UIViewController *)popViewControllerAnimated:(BOOL)animated
{
	if([[self.viewControllers lastObject] class] == [SettingsTableController class]){
 
		[UIView beginAnimations:nil context:NULL];
		[UIView setAnimationDuration: 1.00];
		[UIView setAnimationTransition:UIViewAnimationTransitionCurlDown
					forView:self.view cache:NO];
 
		UIViewController *viewController = [super popViewControllerAnimated:NO];
 
		[UIView commitAnimations];
 
		return viewController;
	} else {
		return [super popViewControllerAnimated:animated];
	}
}
@end

Use your custom navigationController in your appDelegate:

customNavigationController *navigationController =
 [[customNavigationController alloc] 
		initWithRootViewController:rootView];

7 Responses to “Custom action on Back Button UINavigationController”

  1. Rob on December 16th, 2009 at 03:06

    This code worked a treat. It’s so simple and obvious.

  2. fe on May 11th, 2010 at 15:58

    looks great, but I’m using xib. mmm…

  3. Hans Pinckaers on May 11th, 2010 at 16:28

    Isn’t it possible to define your UINavigationController object in Interface Builder as a customNavigationController instance?

  4. Jules on May 24th, 2010 at 13:04

    Ah got it working with the IB as mentioned above.

    However, I’d like to ask the user if there sure they want to quit.
    Don’t know how to do that. I tried commenting out the code within the IF block, but it keeps my current controller and shows the main controller title.

    What should I do here ?

  5. Hans Pinckaers on May 24th, 2010 at 13:12

    You could create a delegate method like “-(BOOL)navigationController:shouldPopViewController:”. Make your window the delegate. Return NO to that method. Display an UIAlertView and then pop again and return YES to that delegate method.

  6. Jules on May 24th, 2010 at 13:52

    Could you provide an example of that ?

  7. Hans Pinckaers on May 24th, 2010 at 13:54

    Yes, I will rewrite the article when I have time, providing the example.

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