将导航栏转换为Tabbar应用程序

我想知道如何将NavigationController样式的应用程序转换为TabbarController样式的应用程序。我将主窗口更改为不再包含导航控制器(改为TabbarController)和我的代理,但当我启动应用程序时,仍有人认为我需要导航控制器:

由于未捕获异常“nsUnknownKeyException”,正在终止应用程序,原因:“[setValue:ForUndefinedKey:]:此类不是键导航控制器的键值编码兼容。”

堆栈跟踪:

#0 0x020fa004 in ___TERMINATING_DUE_TO_UNCAUGHT_EXCEPTION___
#1 0x96fc0509 in objc_exception_throw
#2 0x020ee1c1 in -[NSException raise]
#3 0x000d8a78 in _NSSetUsingKeyValueSetter
#4 0x000d84c5 in -[NSObject(NSKeyValueCoding) setValue:forKey:]
#5 0x004fb4c8 in -[UIRuntimeOutletConnection connect]
#6 0x020af92f in -[NSArray makeObjectsPerformSelector:]
#7 0x004f9f7f in -[UINib instantiateWithOptions:owner:loadingResourcesFromBundle:]
#8 0x004fbfcb in -[NSBundle(NSBundleAdditions) loadNibNamed:owner:options:]
#9 0x0033b0a6 in -[UIApplication _loadMainNibFile]
#10 0x0034482a in -[UIApplication _runWithURL:sourceBundleID:]
#11 0x00341b88 in -[UIApplication handleEvent:withNewEvent:]
#12 0x0033d6d3 in -[UIApplication sendEvent:]
#13 0x003440b5 in _UIApplicationHandleEvent
#14 0x0265aed1 in PurpleEventCallback
#15 0x02092b80 in CFRunLoopRunSpecific
#16 0x02091c48 in CFRunLoopRunInMode
#17 0x0033be69 in -[UIApplication _run]
#18 0x00345003 in UIApplicationMain
#19 0x00002ec8 in main at main.m:14

我的代表界面如下:

@interface CPPlayerAppDelegate : NSObject <UIApplicationDelegate, UITabBarControllerDelegate> {
    UIWindow *window;
 UITabBarController *tabBarController;
}

#pragma mark -
#pragma mark Window/view
@property (retain) IBOutlet UIWindow *window;
@property (retain) IBOutlet UITabBarController *tabBarController;

我代表的执行情况:

@implementation CPPlayerAppDelegate

@synthesize window;
@synthesize tabBarController;

@synthesize stateController, distribution, languageManager, updateParser, soundPlayer, ticketProcessor;

#pragma mark -
#pragma mark Application lifecycle

- (void)applicationDidFinishLaunching:(UIApplication *)application { 
 [window addSubview: tabBarController.view];
    [window makeKeyAndVisible];
}

在哪里可以指定应用是TabbarControlled应用,而不是NavigationBarControlled应用?

事先谢谢,