IOS navigationController?.popToRootViewController has wrong

Question

@IBAction func addInformation(_ sender: UIBarButtonItem) {
    // check rateHourly has value
    if let editedRateHourly = rateHourly.text {
        print("editedRateHourly condition is \(editedRateHourly)")
        if editedRateHourly != ""{
            print("not nil")
            // check edit value is number?
            let num = Int(editedRateHourly)
            if num != nil {
                print("is num")
                // add to database
                UserDefaults.standard.set(editedRateHourly, forKey: "\(findDate())")
                UserDefaults.standard.synchronize()
                // back to last viewController
                navigationController?.popToRootViewController(animated: true)
            }else{
                print("not num")
                print("error alert push!!")
                popErrorAlert()
            }
        }else {
            print("nil")
            print("editedRateHourly condition is nil")
            popErrorAlert()
        }
    }
}
@IBAction func cannelInformationPage(_ sender: UIBarButtonItem) {
    navigationController?.popToRootViewController(animated: true)
}

I want to create a new simple edit page. It's two problem for me that when I finish edition if-else will check the condition is correct or not and then save the data popToRootViewControlle. When I finish edition I click on "addInformation" BarButtonItem and I get UI wrong. the Other wrong is when I click on editField but I don't enter any condition. And then I click on "cannelInformationPage" UIBarButtonItem. It also get wrong.

It's what I get wrong

wrong information

It's not clear what do you mean under **I get UI wrong**? If you roor controller should display updated information from UserDefaults then you should manually refresh it e.g on viewWillAppear — Evgeniy Gushchin, Apr 10 '17 at 04:48
https://i.stack.imgur.com/E2tmE.png I mean when I click the "cannelInformationPage" or "addInformation".the code should be run "navigationController?.popToRootViewController(animated: true)".but it push the wrong — Chien-an Lin, Apr 10 '17 at 04:58
Did your app crashed ? According to attached image, your app crashed due to some reasons and not wrong UI. — Surjeet Singh, Apr 10 '17 at 05:02
@Chien-anLin could you show error from debug terminal? On image there is only part of stack trace — Evgeniy Gushchin, Apr 10 '17 at 05:07
https://i.stack.imgur.com/gTttq.png I get this wrong message — Chien-an Lin, Apr 10 '17 at 06:58
I have a feeling that you have an `IBOutlet/IBAction` that is not tagged correctly in your `ViewController` that's why it crashes — Zonily Jame, Apr 10 '17 at 08:14

score 1 · Answer 1 · answered Apr 10 '17 at 04:34

1

Because it returns Bool

_ = navigationController?.popToRootViewController(animated: true)

answered Apr 10 '17 at 04:34

anshul king

558
4
17

score 1 · Answer 2 · answered Apr 10 '17 at 05:29

1

_ = self.navigationController?.popViewController(animated: true)

If you want to come back to last view controller than you can try above line, hope its work for you.

answered Apr 10 '17 at 05:29

devang bhatt

460
2
15

I try add self, but it doesn't work. If I take off all the if-else,it can work – Chien-an Lin Apr 10 '17 at 07:03
Have you try popViewController(animated: true) ? – devang bhatt Apr 10 '17 at 10:57
You need to go back to View Controller when you pressed to UIBarButtonItem? Then you must try , @IBAction func cannelInformationPage(_ sender: UIBarButtonItem) { _ = navigationController?.popToRootViewController(animated: true) } – devang bhatt Apr 11 '17 at 05:18
Please check that @IBAction method is properly connnected or not? – devang bhatt Apr 11 '17 at 09:53

IOS navigationController?.popToRootViewController has wrong

2 Answers2