adding view of another UIViewController to a UIViewController causes black gap

[rukiman]

I have written a UIViewController that is to manage UIViewControllers in a similar way to the UITabBarController except I didn't want the bottom tab GUI. In a nutshell what my UITabBarControllerCustomer does it keeps all the view controllers in an array and then adds and removes the view of the view controllers as required to work like a tab controller. Everything is working as I expect however I get an unwanted black gap at the top of the my screen just after the status bar (battery etc). This gap seems exactly like the height of the status bar. How can I get rid of this black bar?


Here is my code:

*******TestApplication.m*****
#import "TestApplication.h"
#import "ViewController1.h"

@implementation TestApplication

@synthesize window;
@synthesize tabBarController;


- (UIView *)applicationStartWithSettings
{
ViewController1 *viewcontroller1 = [[[ViewController1 alloc]
initWithStyle:UITableViewStyleGrouped] autorelease];

tabBarController = [[UITabBarControllerCustom alloc] initWithViewControllers:[NSArray arrayWithObjects:
viewcontroller1, nil]];

return tabBarController.view;
}



- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{

self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
[window addSubview: [self applicationStartWithSettings]];
[window makeKeyAndVisible];

return true;
}


- (void)dealloc
{
[tabBarController release];
[window release];
[super dealloc];
}

@end



********UITabBarControllerCustom.m*******

#import "UITabBarControllerCustom.h"

@implementation UITabBarControllerCustom

- (id)initWithViewControllers:(NSArray *)viewControllers
{
if (self = [super init])
{
viewcontrollers = [[NSMutableArray alloc] init];
int count = [viewControllers count];
for(int i=0; i<count; i++)
{
UIViewController *vc = [viewControllers objectAtIndex:i];
[viewcontrollers addObject:vc];
}
currentViewIndex = 0;
}

return self;
}

- (void) setSelectedIndex:(int)index
{
// removing current view
UIViewController *viewcontroller = [viewcontrollers objectAtIndex:currentViewIndex];
[viewcontroller viewWillDisappear:NO];
[viewcontroller.view removeFromSuperview];
[viewcontroller viewDidDisappear:NO];

// adding new view
currentViewIndex = index;
viewcontroller = [viewcontrollers objectAtIndex:currentViewIndex];
[viewcontroller viewWillAppear:NO];
[self.view addSubview:viewcontroller.view];
[viewcontroller viewDidAppear:NO];
}

- (int) selectedIndex
{
return currentViewIndex;
}

- (void) viewWillAppear:(BOOL)animated
{
// display the correct uiviewcontroller
[self setSelectedIndex:currentViewIndex];
}

- (void)dealloc
{
[viewcontrollers dealloc];
[super dealloc];
}

@end


*********ViewController1.m**********

#import "ViewController1.h"
#import "TestApplication.h"


@implementation ViewController1

- (id)initWithStyle:(UITableViewStyle)style
{
if (self = [super initWithStyle:style])
{
self.title = NSLocalizedString(@"ViewController1", @"ViewController1View");
}

return self;
}

- (void)dealloc
{
[super dealloc];
}


@end

[rukiman]

Adding this line

self.view.frame = [[UIScreen mainScreen] bounds];

in UITabBarControllerCustom.m in initWithViewController() removed the black bar when the application started, however when I show a modal UIViewController and come back once again the black bar appears. ( Any ideas??