Add UIBarButtomItem as Child of UITabBarController - ios

Question

I have a UIViewController with a UITableView embedded in a UINavigationController, that starts a UITabBarController. The navigation bar is displayed including the back button and I can change the title of the navigation item programmatically from the UITabBarController.
But I can't add a UIBarButtonItem to the child controllers of the UITabBarController. Neither in the storyboard, nor programmatically.
I also tried to embed the child controller in a UINavigationController, but that just added a second navigation bar. How do I add UIBarButtonItems from a child of a UITabBarController?

Answer 1

In your storyboard, your view controller is inside navigation controller. And your child view controller is INSIDE tab bar controller of your view controller. You're not able to add bar button because you're not able to access navigationController property (which is nil in your child controller case.)
Debug this by accessing navigationController and tabBarController. In your case it should be tabBarController?.navigationController most probably.
EDIT
This is how I maintain navigation bar in code:
final class MyVC: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
setupNavigationBar(withTitle: "MyVC")
}
}
extension UIViewController {
func setupNavigationBar(withTitle title: String? = nil) {
let backButton = UIBarButtonItem(image: #imageLiteral(resourceName: back), style: .plain, target: self, action: #selector(popVC(animated:)))
backButton.tintColor = .white
navigationItem.leftBarButtonItem = backButton
navigationItem.title = title
}
#objc
func popVC(animated: Bool = true) {
navigationController?.popViewController(animated: true)
}
}

Answer 2

Try the following code for set the left and right BarButton programatically.You can add the given code in viewDidload your child TabBarController.
let cancelBtn = UIButton(type: .custom)
cancelBtn.frame = CGRect(x: 0, y: 0, width: 40, height: 15)
cancelBtn.setTitle("Cancel", for: .normal)
cancelBtn.setTitleColor(UIColor.init(red: 240/255, green: 36/255, blue: 70/255, alpha: 1.0), for: .normal)
cancelBtn.addTarget(self, action: #selector(cancelTapped), for: .touchUpInside)
self.navigationItem.leftBarButtonItem = UIBarButtonItem(customView: cancelBtn)
let resetBtn = UIButton(type: .custom)
resetBtn.setTitle("Reset", for: .normal)
resetBtn.setTitleColor(UIColor.init(red: 240/255, green: 36/255, blue: 70/255, alpha: 1.0), for: .normal)
resetBtn.addTarget(self, action: #selector(resetTapped), for: .touchUpInside)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: resetBtn)
and also add the following codes to make it sure the property of navigation bar is true..
override func viewWillAppear(_ animated: Bool)
{
super.viewWillAppear(animated)
// Hide the navigation bar on the this view controller
self.navigationController?.setNavigationBarHidden(true, animated: animated)
}
override func viewWillDisappear(_ animated: Bool)
{
super.viewWillDisappear(animated)
// Show the navigation bar on other view controllers
self.navigationController?.setNavigationBarHidden(false, animated: animated)
}

Answer 3

I have one suggestion for you. Please just remove the Show Segue Between the Person List ViewController to the Person Detail ViewController. and then you embed In Navigation to Person Detail ViewController.
And on the didselect tableview method set the 'Person Detail ViewController` as RootViewController Then You can add the NavigationBar Item in the childViewController also.