Swift - UITabBarController as ChildViewController is not working - ios

Question

I need to add UITabBarController as a subview of RootViewController, but that UITabBarController can't be touched.
Here is my code. How can i fix it?
func addSubviewToSelf(){
var tabVC = TabBarVC()
addChildViewController(tabVC)
self.view.addSubview(tabVC.view)
tabVC.didMove(toParentViewController: self)
tabVC.view.snp.makeConstraints{ (make) in
make.top.bottom.left.right.equalTo(self.view)
}
}

Answer 1

Here is the simplified version of adding UITabBarController as childView of UIViewController, I'm using NSLayoutAnchor API in place of SnapKit
import UIKit
class RootViewController: UIViewController {
override func loadView() {
view = UIView()
view.backgroundColor = .white
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
addChildVC()
}
func addChildVC() {
let tabBarVC = TabBarVC()
addChild(tabBarVC)
view.addSubview(tabBarVC.view)
tabBarVC.view.translatesAutoresizingMaskIntoConstraints = false
NSLayoutConstraint.activate([
tabBarVC.view.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tabBarVC.view.trailingAnchor.constraint(equalTo: view.trailingAnchor),
tabBarVC.view.bottomAnchor.constraint(equalTo: view.bottomAnchor),
tabBarVC.view.topAnchor.constraint(equalTo: view.topAnchor)
])
tabBarVC.didMove(toParent: self)
}
}
The UITabBarController subclass is below
class TabBarVC: UITabBarController, UITabBarControllerDelegate {
override func viewDidLoad() {
super.viewDidLoad()
delegate = self
// Do any additional setup after loading the view.
configureTabBarItems()
}
func configureTabBarItems() {
let vc1 = UIViewController()
vc1.view.backgroundColor = .orange
vc1.tabBarItem = UITabBarItem(tabBarSystemItem: .search, tag: 0)
let vc2 = UIViewController()
vc2.view.backgroundColor = .yellow
vc2.tabBarItem = UITabBarItem(tabBarSystemItem: .bookmarks, tag: 1)
let navigationController1 = UINavigationController(rootViewController: vc1)
let navigationController2 = UINavigationController(rootViewController: vc2)
setViewControllers([navigationController1, navigationController2], animated: false)
tabBar.tintColor = .red
tabBar.unselectedItemTintColor = .black
}
}
As you have not given UITabBarController subclass implementation, you may create some UIViewControllers and assign it to setViewControllers(_ viewControllers::[UIViewControllers]?, animated: Bool) method. Also set tintColor and unselectedItemTintColor properties and check if works for you. Finally Clean Build project and run, it should work for you.

Answer 2

If the Tabbarvc is about for all App , I think you can call in AppDelegate. Write this code in didFinishLaunch in AppDelegate
window = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "TabBarStoryBoard", bundle: Bundle.main)
let viewController = storyboard.instantiateInitialViewController()
window?.rootViewController = viewController
window?.makeKeyAndVisible()
return true