How to add UITabBarController programmatically (no xib file or storyboard) - iphone

Question

I want to add a UITabBarController to my application. But I have to do it with code only. No xib files or storyboards. How to do this entirely through code?
EDIT:
_tbc = [[UITabBarController alloc] init];
aboutUsView = [[AboutUsView alloc] init];
helpView = [[HelpView alloc] init];
optionsView = [[OptionsView alloc] init];
self.navCon = [[UINavigationController alloc] initWithRootViewController:optionsView];
[self setnavigationCon:self.navCon];
[optionsView setdataLayer:self];
if ([navCon.navigationBar respondsToSelector:#selector(setBackgroundImage:forBarMetrics:)] ) {
UIImage *image = [UIImage imageNamed:#"Navigation Bar_reduced.png"];
[self.navCon.navigationBar setBackgroundImage:image forBarMetrics:UIBarMetricsDefault];
[optionsView addSelfView:window];
}
_tbc.viewControllers = [NSArray arrayWithObjects:navCon, aboutUsView, helpView, nil];
[window addSubview:_tbc.view];

Answer 1

Try this
AppDelegate.h
#interface AppDelegate : UIResponder <UITabBarControllerDelegate>
#property (strong, nonatomic) UITabBarController *tabBarController;
AppDeleGate.m
UINavigationController *nc1;
nc1 = [[UINavigationController alloc] init];
[nc1.navigationBar setTintColor:[UIColor blackColor]];
UIViewController *viewController1 = [[[FirstScreen alloc] initWithNibName:#"FirstScreen_ipad" bundle:nil] autorelease];
nc1.viewControllers = [NSArray arrayWithObjects:viewController1, nil];
UINavigationController *nc2;
nc2 = [[UINavigationController alloc] init];
[nc2.navigationBar setTintColor:[UIColor blackColor]];
UIViewController *viewController2 = [[[FullList alloc] initWithNibName:#"FullList_ipad" bundle:nil] autorelease];;
nc2.viewControllers = [NSArray arrayWithObjects:viewController2, nil];
UIViewController *viewController3 = [[[FavouriteView alloc] initWithNibName:#"FavouriteView_ipad" bundle:nil] autorelease];
UINavigationController *nc3;
nc3 = [[UINavigationController alloc] init];
[nc3.navigationBar setTintColor:[UIColor blackColor]];
nc3.viewControllers = [NSArray arrayWithObjects:viewController3, nil];
UIViewController *viewController4 = [[[UpcomingFights alloc] initWithNibName:#"UpcomingFights_ipad" bundle:nil] autorelease];
UINavigationController *nc4;
nc4 = [[UINavigationController alloc] init];
[nc4.navigationBar setTintColor:[UIColor blackColor]];
nc4.viewControllers = [NSArray arrayWithObjects:viewController4, nil];
self.tabBarController = [[[UITabBarController alloc] init] autorelease];
self.tabBarController.viewControllers = [NSArray arrayWithObjects:nc1, nc2,nc3,nc4 ,nil];
self.window.rootViewController = self.tabBarController;
[self.window makeKeyAndVisible];
ICON FOR TABBAR
In your ViewController.m file do as follow:
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self.title = NSLocalizedString(#"YOUR View NAME", #"YOUR VIEW NAME");
self.tabBarItem.image = [UIImage imageNamed:#"YOUR IMAGE NAME"];
return self;
}

Answer 2

Add this code in your AppDelegate.m
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
FirstViewController * fvc=[[FirstViewController alloc]initWithNibName:#"FirstViewController" bundle:nil];
SecondViewController * svc=[[SecondViewController alloc]initWithNibName:#"SecondViewController" bundle:nil];
ThirdViewController * tvc=[[ThirdViewController alloc]initWithNibName:#"ThirdViewController" bundle:nil];
FourthViewController * fvc2=[[FourthViewController alloc]initWithNibName:#"FourthViewController" bundle:nil];
tabbar=[[UITabBarController alloc]init];
tabbar.viewControllers=[NSArray arrayWithObjects:fvc,svc,tvc,fvc2,nil];
[self.window addSubview:tabbar.view];
}

Answer 3

Here is the code from user1673099 in Swift (nice username btw... ;0) -
func initialize_tabs() {
var ncArr : [UINavigationController] = [UINavigationController]();
for _ in 0...3 {
let nc : UINavigationController = UINavigationController();
let vc = UIViewController();
nc.viewControllers = [vc];
let v : UIView = UIView(frame: UIScreen.mainScreen().bounds);
let redC : CGFloat = CGFloat(arc4random_uniform(255))/CGFloat(255);
let greenC : CGFloat = CGFloat(arc4random_uniform(255))/CGFloat(255);
let blueC : CGFloat = CGFloat(arc4random_uniform(255))/CGFloat(255);
v.backgroundColor = UIColor(red: redC, green: greenC, blue: blueC, alpha: 1);
let l : UILabel = UILabel(frame: UIScreen.mainScreen().bounds);
l.text = "Test Label";
l.textAlignment = .Center;
v.addSubview(l);
vc.view = v;
ncArr.append(nc);
}
self.tabBarController = UITabBarController();
self.tabBarController.viewControllers = ncArr;
return;
}