How to load storyboard viewcontroller into programmatically tabbar controller in ios siwft?

Question

I have tabbar controller which done programmatically. And tab bar is working fine. In stroyboard, i have created firstViewController and assigned class name firstViewController. When i tried to tab on first vc on tab bar controller to navigates to first viewcontroller and it crash. if i give programmatically mean it works fine.

How to navigate from programmatically tab bar controller to storyboard view controller.

here is my code of tab bar controller:

 let tabBarCnt = UITabBarController()
 func createTabBarController() {

    let firstVC = FViewController()
    firstVC.tabBarItem = UITabBarItem(tabBarSystemItem: .search, tag: 0)

    let secondVC = SViewController()
    secondVC.tabBarItem = UITabBarItem(tabBarSystemItem: .more, tag: 1)

    let thirdVC = ViewController()
    thirdVC.tabBarItem = UITabBarItem(tabBarSystemItem: .history, tag: 2)

    let fourthVC = ViewController()
    fourthVC.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 3)


    if UIDevice.current.userInterfaceIdiom == .pad {
        let controllerArray = [firstVC, secondVC, thirdVC, fourthVC]
        tabBarCnt.viewControllers = controllerArray.map{ UINavigationController.init(rootViewController: $0)}

        self.view.addSubview(tabBarCnt.view)
    } else {
        let controllerArray = [firstVC, secondVC]
        tabBarCnt.viewControllers = controllerArray.map{ UINavigationController.init(rootViewController: $0)}

        self.view.addSubview(tabBarCnt.view)
    }

}

Here is my firstVC of firstViewController code:

import UIKit

class FViewController: UIViewController, UITabBarDelegate {

@IBOutlet weak var firstBtn: UIButton!

@IBOutlet weak var fview: UIView!
override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor =  UIColor.blue
 // self.fview.backgroundColor = .brown


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


}

Answer 1

Please try below code. you can give view controller identifier by interface builder.

let tabBarCnt = UITabBarController()
func createTabBarController() {
let storyboard = UIStoryboard(name: "MainStoryboard", bundle: nil)
let firstVC = storyboard?.instantiateViewControllerWithIdentifier("FViewController")
firstVC.tabBarItem = UITabBarItem(tabBarSystemItem: .search, tag: 0)

let secondVC = storyboard?.instantiateViewControllerWithIdentifier("SViewController")
secondVC.tabBarItem = UITabBarItem(tabBarSystemItem: .more, tag: 1)

let thirdVC = storyboard?.instantiateViewControllerWithIdentifier("ViewController")
thirdVC.tabBarItem = UITabBarItem(tabBarSystemItem: .history, tag: 2)

let fourthVC = storyboard?.instantiateViewControllerWithIdentifier("ViewController")
fourthVC.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 3)

   var controllerArray = [firstVC, secondVC]
if UIDevice.current.userInterfaceIdiom == .pad {
      controllerArray += [thirdVC, fourthVC]        
} 
     tabBarCnt.viewControllers = controllerArray.map{ UINavigationController.init(rootViewController: $0)}
    self.view.addSubview(tabBarCnt.view)
}