Making a dynamic NavigationBar

Question

I want a UINavigationBar whose contents change in response to other events in the app. Most immediately, I'd like to have the buttons on the bar loaded dynamically in response to other variables in the program. But in the more general case I'd like to be able to change the contents of the UINavigationBar on the fly, while the program is running.

The hurdle I'm running into is that the UINavigationBar loads its contents when its first displayed and there doesn't seem to be a method to make it alter them after that. What's the best workaround?

msgambel · Accepted Answer · 2011-08-11 16:48:37Z

1

This is fairly easy to do. The best way is to pre-load all of the options for the different objects you want in your navBar so that you need only switch them in and out based on the user's input, but you can load them on the fly. When the user does an action which you want to change the navBar, simply add:

self.navigationItem.rightBarButtonItem = nil;
UIBarButtonItem * newButton = [[UIBarButtonItem alloc] initWithTitle:@"What you want to call it" style:UIBarButtonItemStyleBordered target:self action:@selector(whatYouWantTheButtonToCall)];
self.navigationItem.rightBarButtonItem = newButton;
[newButton release];

For other options then a button, you can look here. Hope that helps!

answered Aug 11, 2011 at 16:48

msgambel

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7 Comments

baudot Over a year ago

What you've just described is exactly what fails. As stated in the write-up, once the view is loaded, simply changing the button property doesn't change the view.

msgambel Over a year ago

By the contents of the navBar, you you mean the navBar itself, or the current view displayed under the navBar? If it's the former, then the above code works.

baudot Over a year ago

Changing the NavBar itself. I've tested the snippet provided, and it doesn't work. We're talking about dynamically changing the view AFTER the screen has finished loading. The whole problem is that changes to the properties don't appear.

baudot Over a year ago

The answer turns out to be running [self loadView] on the viewController after you make the needed change.

msgambel Over a year ago

That's not true. This works AFTER the screen has been loaded. Hook it up to a button and test it out.

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baudot · Accepted Answer · 2011-08-12 06:00:56Z

0

OK, I found one way: After editing a navigation bar item, you can call [self loadView] ...to prompt a reload.

That works, but it's a bit blech.

answered Aug 12, 2011 at 6:00

baudot

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