Get Out of Navigation Controller and Go Back to Tab Bar View

Go back to view controller from tab bar controller

You can try

self.navigationController?.navigationController?.popToRootViewController(animated: true)

How to dismiss a Tab Bar Controller and go back to previous view controller on click of button

You added tabBarController in secondViewController as subView. So you need to remove that tabBarController view from super view.

For that, you need a tabBarController object.

self.tabBarController?.view.removeFromSuperview()

TabBarController disappears when I segue back to the view from another view

You are following a wrong hierarchy. You are actually using seagues to go back and forth. This creates a new instance every time you try to come back to the first controller.

Let's make it clear:

You need to follow the below approach:

1 You have two controllers A and B.

2 Use self.hidesBottomBarWhenPushed = true in viewDidLoad or viewWillAppear of controller A.

3 Controller A is embedded in a navigation controller which is further embedded in a UITabBarController.

Tapping a button in controller A, you need to push to controller B. So you can use segue for this or you can do it programatically like:

let controllerB = B()
A.navigationController?.pushViewController(controllerB, animated: true)

4 Go Back to Controller A on the tap UIBarButtonItem. So your code in the action of UIBarButtonItem should be something like:

self.navigationController?.popViewController(animated: true)

Remember you should not should segue to go back to the previous controller.

How to dismiss controller and then switch tabs

Make sure you have a UINavigationController as the first ViewController. Then you have access to the tabBarController and can then switch the tabs:

// if vc was pushed
@IBAction func onFinish(_ sender: Any) {
    // store tabBarController for later use
    let tabBarController = self.tabBarController

    // pop to root vc (green one)
    _ = self.navigationController?.popToRootViewController(animated: false)

    // switch to 2nd tab (red vc)
    tabBarController?.selectedIndex = 1
}

---

// if vc was presented modally
@IBAction func onFinish(_ sender: Any) {
    self.dismiss(animated: false, completion: nil)

    if let tabBarController = self.presentingViewController as? UITabBarController {
        tabBarController.selectedIndex = 1
    }
}

---

// if vc was presented modally + switching tab in completion block
@IBAction func onFinish(_ sender: Any) {
    if let tabBarController = self.presentingViewController as? UITabBarController {
        self.dismiss(animated: true) {
            tabBarController.selectedIndex = 1
        }
    }
}

My tab bar and navigation controller disappears when i register for account

I should see the full Storyboard logic to give you a better answer, but I think your answer will be somewhere the presentation style.
NOTE: Only a suggestion, but your view hierarchy should be reviewed, because when you log in your homeviewcontoller(you can "pop" back, or you can replace the whole viewstack) should be your rootviewcontroller, and if I understand correctly there is a stack when you click through login. But here is a possible quick fix:

homeVC.modalPresentationStyle = .currentContext

If it does not help, one of these will:
https://developer.apple.com/documentation/uikit/uimodalpresentationstyle

Changing view controller to tab bar controller

First of all, presentViewController:animated:completion: will present SettingsViewController modally. What you need is a UINavigationController flow.

1) Add create UITabBarController

2) Select the item(UIViewController) that will has a UINavigationControler flow.

3) Delete it

4) Add UITableViewController

5) Add the new UITableViewController to the UITabBarController

6) Select the UITableViewController and embed in(Editor > Embed In > Navigation Controller) to a Navigation Controller.

7) Add a UIViewController and add a segue(Show) between UITableViewController and UIViewController

8) The result final result should be something like this:

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