CODEWITHSUNDEEP
iphoneobjective-cxcodeios4delegates
oscarm
oscarm

Reputation: 2650

Problem with Delegate and NavigationController

I'm using a NavigationController to "push" viewControllers from the rootView of an app.

I want to use delegates to comunicate the currently loaded view and the rootViewController. I was able to do this using NSNotificationCenter, but want give a try to delegates for this particular situation, since the communication is always going to be one-to-one.

In the view that is pushed, I declared the following delegate protocole in the header file:

#import <UIKit/UIKit.h>

@protocol AnotherViewControllerDelegate;

@interface AnotherViewController : UIViewController {
    id <AnotherViewControllerDelegate> delegate;
}

- (IBAction) doAction;

@property (nonatomic, assign) id delegate;

@end


@protocol AnotherViewControllerDelegate <NSObject>
- (void) doDelegatedAction:(AnotherViewController *)controller;
@end

The doAction IBAction is connected to a UIButton in the view. In my implementation file, I added:

#import "AnotherViewController.h"    
@implementation AnotherViewController

@synthesize delegate;

- (IBAction) doAction {
    NSLog(@"doAction");
    [self.delegate doDelegatedAction:self];
}

In my RootViewController.h I added AnotherViewControllerDelegate to the interface declaration:

@interface RootViewController : UIViewController <AnotherViewControllerDelegate> {...

and this to my implementation file

- (void) doDelegatedAction:(AnotherViewController *)controller {
    NSLog(@"rootviewcontroller->doDelegatedAction");
 }

Unfortunately it's not working. doDelegatedAction in the rootViewController is not been called. I suspect it's because of the way I push the AnotherViewController:

    AnotherViewController *detailViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherViewController" bundle:nil];
    [self.navigationController pushViewController:detailViewController animated:YES];
    [detailViewController release];

Should I tell, in any way, to AnotherViewController that its delegate is going to be RootViewController just in the moment it's been pushed? or am I missing something else?

Upvotes: 3

Views: 2574

Answers (1)

raid5ive
raid5ive

Reputation: 6642

You need to set the delegate of AnotherViewController to the rootViewController in order for everything to be connected up properly.

If you are initializing AnotherViewController in your rootViewController it would be:

AnotherViewController *detailViewController = [[AnotherViewController alloc] initWithNibName:@"AnotherViewController" bundle:nil];
detailViewController.delegate = self;
[self.navigationController pushViewController:detailViewController animated:YES];

Upvotes: 1

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