Segueing from Child ViewController - swift

Question

I have a situation where I am presenting a child view controller "B" onto another view controller "A". View controller "B" has 5 buttons which segue(push) to a third view controller, "C". The problem is once I'm at view controller "C", I want to be able to use an unwind segue to go from C-->A without B showing up in the middle.
// view controller A class
class AViewController: UIViewController {
#IBAction func goToViewControllerB(_ sender: UIButton) {
let viewControllerB = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "viewControllerB_ID") as! BViewController
self.addChild(viewControllerB)
viewControllerB.view.frame = self.view.frame
self.view.addSubview(viewControllerB.view)
viewControllerB.didMove(toParent: self)
}
#IBAction func unwindToStart(segue: UIStoryboardSegue) {
print("back from view controller C!")
}
}
//view controller B class
class BViewController: UIViewController {
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
switch identifier {
case "segueFromBToC_1":
if let destVC = segue.destination as? CViewController {
//pass data
}
// ... cases 2-4
case "segueFromBToC_5":
if let destVC = segue.destination as? CViewController {
//pass data
}
default: break
}
}
}
}
// empty CViewController class
I know that putting the following code in my view controller B class will remove it from the parent view controller, "A", but then I can't segue from "B" to "C" anymore as "B" doesn't exist.
self.view.removeFromSuperview()
self.removeFromParent()
self.willMove(toParent: nil)
I was wondering where I should put the above code or if I should segue from a child view controller at all? I also haven't used navigation controllers as I don't know how to implement them with a child view controller. Should I have #IBAction outlets for each of the 5 buttons and put the above code in there?

Answer 1

UPDATE: I was able to fix it by detaching the 5 push segues from the buttons and have each of the 5 push segues go directly from view controller B to view controller C . I then had an #IBAction for each button where I had the following code in view controller B:
class BViewController: UIViewController {
#IBAction func button1ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_1")
}
#IBAction func button2ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_2")
}
#IBAction func button3ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_3")
}
#IBAction func button4ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_4")
}
#IBAction func button5ToVC3(_ sender: UIButton) {
segueAndRemoveSelf(segueName: "segueFromBToC_5")
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let identifier = segue.identifier {
switch identifier {
case "segueFromBToC_1":
if let destVC = segue.destination as? CViewController {
//pass data
}
// ... cases 2-4
case "segueFromBToC_5":
if let destVC = segue.destination as? CViewController {
//pass data
}
default: break
}
}
}
}
extension BViewController {
func segueAndRemoveSelf(segueName: String) {
self.performSegue(withIdentifier: segueName, sender: self)
self.view.removeFromSuperview()
self.removeFromParent()
self.willMove(toParent: nil)
}
}
Not sure if this is best practice though.