使用快速操作时导航栏丢失

Question

I am using quick actions for my app and they are working correctly, except that the Navigation Bar is missing (no back button). Here is my code:

func application(_ application: UIApplication, performActionFor shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping (Bool) -> Void) {
    let vc = storyboard.instantiateViewController(withIdentifier: "AddViewController") as! AddViewController

    switch shortcutItem.type {
    case "AddIncome":
        vc.type = .income
        app?.mainVC.dismiss(animated: false, completion: nil)
        app?.mainVC.present(vc, animated: true, completion: nil)
    case "AddExpense":
        vc.type = .expense
        app?.mainVC.dismiss(animated: false, completion: nil)
        app?.mainVC.present(vc, animated: true, completion: nil)
    default:
        break;
    }
}

mainVC is actually the view controller from where I present the AddViewController , the vc where my navigation bar is missing.

I can't seem to see what the issue is. Do I have to do some additional stuff to make it work correctly ?

Answer 1

@Kobe You need to add a navigation controller to show navigation bar when you presenting any view controller. Just try below code.

func application(_ application: UIApplication, performActionFor shortcutItem: UIApplicationShortcutItem, completionHandler: @escaping (Bool) -> Void) {
    let vc = storyboard.instantiateViewController(withIdentifier: "AddViewController") as! AddViewController
    var nav = UINavigationController()
    nav.viewControllers = [vc]
    switch shortcutItem.type {
    case "AddIncome":
        vc.type = .income
        app?.mainVC.dismiss(animated: false, completion: nil)
        app?.mainVC.present(nav, animated: true, completion: nil)
    case "AddExpense":
        vc.type = .expense
        app?.mainVC.dismiss(animated: false, completion: nil)
        app?.mainVC.present(nav, animated: true, completion: nil)
    default:
        break;
    }
}

Now you can add back button on AddViewController.

override func viewDidLoad() {
    super.viewDidLoad()
    let button = UIBarButtonItem(title: "Back", style:.plain, target: self, action: #selector(self.moveToPreviousScreen))
    self.navigationItem.backBarButtonItem = button
}

Hope it will help you thanks.

Answer 2

There are a lot of points you can consider:

1. Have you added a Navigation Controller. (I know its too basic but some forget)
2. Have you set your view controller as the root for the navigation controller?
3. You can try setting the navigation bar programmatically.