StackOverflow2013

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POobjective C: Using a Delegate to call a function in parent class
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copied!<p>I'm creating a 3 layer navigation popup controller and on the 3rd popup controller I have a delegate method to access dismissPopup method that is in the parent class. I can't seem to call it, my NSLog messages in the function in the parent class isn't even showing so I must be either using delegation wrong or I'm calling it incorrectly. </p> <p>The 3 classes ParentViewController has a toolbar with a button that brings up the table view --> RegionViewController is the First table view controller with items --> ConusViewController is the 2nd table view controller that is pushed onto the navigation stack. I'm trying to call the method dismissPopover that is in the parent method with a delegation after the selection is clicked on so the whole popover goes away.</p> <p>In the ConusViewController if the delegation had worked I would have seen "Method Accessed" from the function in the parent class. It doesn't show so I must be using delegation wrong.</p> <p>Sorry for being so wordy on my post, I wanted to be complete on what I'm trying to do here. Thanks.</p> <p><em><strong>ParentViewController.h</em></strong></p> <pre><code>#import <UIKit/UIKit.h> #import "ConusViewController.h" @interface EnscoWXViewController : UIViewController <ConusViewControllerDelegate> { UIPopoverController *popoverController; IBOutlet UIWebView *webImageDisplay; ConusViewController *cViewController; } @property (nonatomic, retain) UIPopoverController *popoverController; @property (nonatomic, retain) UIWebView *webImageDisplay; @property (nonatomic, retain) ConusViewController *cViewController; -(IBAction) buttonShowRegion:(id) sender; @end </code></pre> <p><em><strong>ParentViewController.m</em></strong></p> <pre><code>#import "ParentViewController.h" #import "RegionViewController.h" @implementation ParentViewController @synthesize cViewController; -(IBAction) buttonShowRegion:(id) sender { ... } -(void)dismissPopover { [popoverController dismissPopoverAnimated:YES]; printf("Method Accessed\n"); } - (void)viewDidLoad { cViewController = [[ConusViewController alloc] init]; cViewController.delegate = self; [super viewDidLoad]; } </code></pre> <p><em><strong>RegionViewController.m</em></strong></p> <pre><code>- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { switch (indexPath.row) { case 0: { ConusViewController *conusViewController = [[ConusViewController alloc] initWithNibName:@"ConusViewController" bundle:nil]; conusViewController.contentSizeForViewInPopover = CGSizeMake(320, 350); [self.navigationController pushViewController:conusViewController animated:YES]; [conusViewController release]; break; } case 1: { break; } } } </code></pre> <p><em><strong>ConusViewController.h</em></strong></p> <pre><code>#import <UIKit/UIKit.h> @protocol ConusViewControllerDelegate <NSObject> @required - (void)dismissPopover; @end @interface ConusViewController : UITableViewController { NSMutableArray *conusItems; id delegate; } @property (nonatomic, assign) id <ConusViewControllerDelegate> delegate ; @end </code></pre> <p><em><strong>ConusViewController.m</em></strong></p> <pre><code>#import "ConusViewController.h" #import "ParentWXViewController.h" @implementation ConusViewController @synthesize delegate; - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSString *itemRequested = [conusItems objectAtIndex:indexPath.row]; NSLog(@"logging: %@", itemRequested); [delegate dismissPopover]; [itemRequested release]; } </code></pre>

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