(iOS) Navigation & Tabbar controllers

exampleDelegate.mm

- (void)customizeAppearance {
    // customize the navigation bar
    [[UINavigationBar appearance] setTitleTextAttributes:@{UITextAttributeFont : kNavigationBarTitleFont}];
    [[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:@"navbar.png"] forBarMetrics:UIBarMetricsDefault];
    
    // UIBarButtonItem
    UIImage *button = [[UIImage imageNamed:@"button.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 5, 0, 5)];
    [[UIBarButtonItem appearance] setBackgroundImage:button forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    [[UIBarButtonItem appearance] setTitleTextAttributes:@{UITextAttributeFont:[UIFont fontWithName:@"Verdana" size:0.0]} forState:UIControlStateNormal];
    
    // Back Button
    UIImage *buttonBack = [[UIImage imageNamed:@"button_back.png"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 13, 0, 5)];
    [[UIBarButtonItem appearance] setBackButtonBackgroundImage:buttonBack forState:UIControlStateNormal barMetrics:UIBarMetricsDefault];
    
    // customize the tab bar
    [[UITabBar appearance] setBackgroundImage:[UIImage imageNamed:@"tabbar.png"]];
    
    // customize the labels
    //[[UILabel appearance] setTextColor:[UIColor redColor]];
    [[UILabel appearance] setFont:[UIFont fontWithName:@"Verdana" size:18.0]];
}

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
     [self customizeAppearance];

    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    
    self.window.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:ASSET_BY_SCREEN_HEIGHT(@"main_bg")]];
    // Override point for customization after application launch.
    HomeViewController *homeCtrl = [[HomeViewController alloc] init];
    UINavigationController *homeNavCtrl = [[UINavigationController alloc] initWithRootViewController:homeCtrl];
    [homeNavCtrl setNavigationBarHidden:YES animated:NO];
    
    // init search controller
    SearchViewController *searchCtrl = [[SearchViewController alloc] init];
    UINavigationController *searchNavCtrl = [[UINavigationController alloc] initWithRootViewController:searchCtrl];
    
    // init profile controller
    ProfileViewController *profileCtrl = [[ProfileViewController alloc] init];
    UINavigationController *profileNavCtrl = [[UINavigationController alloc] initWithRootViewController:profileCtrl];
    
    // init buy controller
    BuyViewController *buyCtrl = [[BuyViewController alloc] init];
    UINavigationController *buyNavCtrl = [[UINavigationController alloc] initWithRootViewController:buyCtrl];
    
    // init sell controller
    SellViewController *sellCtrl = [[SellViewController alloc] init];
    UINavigationController *sellNavCtrl = [[UINavigationController alloc] initWithRootViewController:sellCtrl];
    
    self.tabBarController = [[UITabBarController alloc] init];

    NSArray* controllers = [NSArray arrayWithObjects:homeNavCtrl, searchNavCtrl, sellNavCtrl, buyNavCtrl, profileNavCtrl, nil];
    self.tabBarController.viewControllers = controllers;
    self.window.rootViewController = self.tabBarController;


    [self.window makeKeyAndVisible];
}