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copied!<p>Currently the <code>UINavigationController</code> does not support this. But there's the <code>UINavigationControllerDelegate</code> that you can use.</p> <p>An easy way to accomplish this is by subclassing <code>UINavigationController</code> and adding a completion block property:</p> <pre><code>@interface PbNavigationController : UINavigationController <UINavigationControllerDelegate> @property (nonatomic,copy) dispatch_block_t completionBlock; @end @implementation PbNavigationController - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { self.delegate = self; } return self; } - (void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated { NSLog(@"didShowViewController:%@", viewController); if (self.completionBlock) { self.completionBlock(); self.completionBlock = nil; } } @end </code></pre> <p>Before pushing the new view controller you would have to set the completion block:</p> <pre><code>UIViewController *vc = ...; ((PbNavigationController *)self.navigationController).completionBlock = ^ { NSLog(@"COMPLETED"); }; [self.navigationController pushViewController:vc animated:YES]; </code></pre> <p>This new subclass can either be assigned in Interface Builder or be used programmatically like this:</p> <pre><code>PbNavigationController *nc = [[PbNavigationController alloc]initWithRootViewController:yourRootViewController]; </code></pre>

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