Open UIViewController upon clicking on UITabbarItem

Question

I have created a UIViewController with a UITabbar in it.

I did not use UITabbarController because I wanted UITabbar on the top of the screen.

Upon clicking tab1, I want to present controller1 and on clicking tab2 I want to present controller 2. I don't want the tabbar to hide. I want to display the controller beneath the tabbar.

@interface MTLeaderFactoViewController () <UITabBarDelegate>
@property (weak, nonatomic) IBOutlet UITabBar *tabBar;
@end

@implementation MTLeaderFactoViewController

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

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
}

- (void)tabBar:(UITabBar *)tabBar didSelectItem:(UITabBarItem *)item {
    if (item.tag == 0) {
        NSLog(@"item tag 0");
    } else {
        NSLog(@"item tag 1");
    }
}
@end

My questions:

1) didSelectItem method is not triggered even after using UITabbarDelegate

2) What is the most elegant way of displaying the controller when clicked on a button? I don't want to use segue as all the controllers are in different storyboards. For now, I plan to do

Controller1 *fp = [Controller1 controllerStoryboard:STORYBOARD_COURSE];
[self addChildViewController:fp];
[self.view addSubview:fp.view];
[fp didMoveToParentViewController:self];

EDIT 1:

    Controller1 *fp = [Controller1 controllerStoryboard:STORYBOARD_COURSE];
    [self addChildViewController:fp];
    [self.view addSubview:fp.view];
    [fp didMoveToParentViewController:self];

Tried this but it hides the tab bar. I want to utilize the space beneath the tab bar to display the controller

Answer 1

What you need to do is have a basecontroller class which will contain a tabbar(programatically created) then you can achive the desired output heres a sample baseController that i created,

import UIKit

class BaseViewController: UIViewController,UITabBarDelegate{

    override func viewDidLoad() {
        super.viewDidLoad()

        let myTabBar = UITabBar()
        myTabBar.frame = CGRect(x: 0, y: 60, width:self.view.frame.size.width, height: 50)

        let one = UITabBarItem()
        one.title = "one"
        one.tag = 1
        let two = UITabBarItem()
        two.title = "two"
        two.tag = 2
        myTabBar.setItems([one,two], animated: false)
        self.view.addSubview(myTabBar)
        myTabBar.delegate = self

    }


    func tabBar(_ tabBar: UITabBar, didSelect item: UITabBarItem) {
        switch item.tag  {
        case 1:
            let controller = storyboard?.instantiateViewController(withIdentifier: "SecondViewController")
            addChildViewController(controller!)
            view.addSubview((controller?.view)!)
            controller?.didMove(toParentViewController: self)
            break
        case 2:
            let controller = storyboard?.instantiateViewController(withIdentifier: "ViewController")
            addChildViewController(controller!)
            view.addSubview((controller?.view)!)
            controller?.didMove(toParentViewController: self)
            break
        default:
            break
        }

    }

}

View Controller class :

import UIKit

class ViewController: BaseViewController {


    override func viewDidLoad() {
        super.viewDidLoad()
                // Do any additional setup after loading the view, typically from a nib.
    }


}

SecondView Controller :

import UIKit

class SecondViewController: BaseViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }



}