Go back to previous view controller doesn't work

Question

My first view controller has a button, which triggers the @IBAction goTo2ndVc() which presents a second ViewController:

class FirstVC: UIViewCon         


        

Answer 1

@IBAction func backToFirst(sender: AnyObject) {
    print("go back ...")
    self.dismissViewControllerAnimated(true, completion: nil)
}

In Swift 3

self.dismiss(animated: true, completion: nil)

you should not use navigation controller, because you didn't use it when you were adding the second view controller. that's why simply call dismissViewControllerAnimated method.

You have to use UINavigationController and its pop methods only when you add your view controllers via pushViewController method.

Familiarize yourself with the concept of navigation controller here: https://developer.apple.com/library/ios/documentation/WindowsViews/Conceptual/ViewControllerCatalog/Chapters/NavigationControllers.html