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Editorial Team
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Asked: 2026-05-22T02:02:30+00:00

I’m creating my first iPhone application (using XCode 4), and I initially created the

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I’m creating my first iPhone application (using XCode 4), and I initially created the project using the Navigation based application template. I’ve since decided that I want the UI to have a Tab Bar down the bottom with a Navigation Bar up the top, but am having difficulty changing my app to do that.

I added a new window to my app, and called it TabWindow.xib. I opened this up in Interface Builder and added a Tab Bar Controller. I then added an outlet property for the controller into AppDelegate.h as follows:-

@property (nonatomic, retain) IBOutlet UITabBarController *tabController;

This was synthesized in AppDelegate.m with the following:-

@synthesize tabController=_tabController;

I then changed the code in applicationDidFinishLaunchingWithOptions to the following (to switch out the old view controller with my new one):-

//self.window.rootViewController = self.navigationController;
self.window.rootViewController = self.tabController;

When I run the application, instead of seeing the Tab Bar view as expected, I see an empty window. I suspect I need to (at the very least) connect to the tabController outlet I created above, but I can’t figure out how to do this. And is there anything else I need to do to get this to work?

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1 Answer

  1. Editorial Team

    You need to add the connection to the app delegate in interface builder. To do this, add an “Object” from the Object library and change its class to your app delegate. Then add the connections in the connections inspector.

    Also, in your applications info plist file, you might have to set “Main nib file base name” to the new xib name.

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