Receiving error: Value of type 'UIViewController' has no member 'openViewControllerBasedOnIdentifier'

Question

I use the following in my AppDelegate to pop an alert to user when push is received:

let topWindow = UIWindow(frame: UIScreen.main.bounds)
topWindow.rootViewController = UIViewController()
topWindow.windowLevel = UIWindowLevelAlert + 1
let alert = UIAlertController(title: "message", message: "message", preferredStyle: .alert)
let yesButton = UIAlertAction(title: "OK", style: .default, handler: {(_ action: UIAlertAction) -> Void in
    print("you pressed Yes, please button")
    topWindow.isHidden = true
    topWindow.rootViewController?.openViewControllerBasedOnIdentifier("consumerProfile")
})
let noButton = UIAlertAction(title: "CANCEL", style: .default, handler: {(_ action: UIAlertAction) -> Void in
    print("you pressed No, thanks button")
    topWindow.isHidden = true
})
alert.addAction(yesButton)
alert.addAction(noButton)

topWindow.makeKeyAndVisible()
topWindow.rootViewController?.present(alert, animated: true, completion: { _ in })

My problem is in:

topWindow.rootViewController?.openViewControllerBasedOnIdentifier("consumerProfile")

The function openViewControllerBasedOnIdentifier only exists in views based on a specific UIViewController class named BaseViewController so i get the following error:

Value of type 'UIViewController' has no member 'openViewControllerBasedOnIdentifier'

what is your problem? You are not able to present Alert from AppDelegate or the error that you have posted? — Gagan_iOS, Sep 04 '17 at 14:42
You just set your `rootViewController` to an empty `UIViewController`. How do you expect to be able to call a method of your custom `BaseViewController` on this `UIViewController`? — rmaddy, Sep 04 '17 at 14:49
Have you seen this: https://stackoverflow.com/questions/30592521/opening-view-controller-from-app-delegate-using-swift — Avi Levin, Sep 04 '17 at 14:54

Yerken · Answer 1 · 2017-09-04T16:06:06.643

0

Just put your custom class as rootViewController

let topWindow = UIWindow(frame: UIScreen.main.bounds)
let topViewController = BaseViewController()
topWindow.rootViewController = topViewController
topWindow.windowLevel = UIWindowLevelAlert + 1
let alert = UIAlertController(title: "message", message: "message", preferredStyle: .alert)
let yesButton = UIAlertAction(title: "OK", style: .default, handler: {(_ action: UIAlertAction) -> Void in
    print("you pressed Yes, please button")
    topWindow.isHidden = true
    topViewController.openViewControllerBasedOnIdentifier("consumerProfile")
})
let noButton = UIAlertAction(title: "CANCEL", style: .default, handler: {(_ action: UIAlertAction) -> Void in
    print("you pressed No, thanks button")
    topWindow.isHidden = true
})
alert.addAction(yesButton)
alert.addAction(noButton)

topWindow.makeKeyAndVisible()
topWindow.rootViewController?.present(alert, animated: true, completion: { _ in })

UPDATE

Because your ViewController doesn't have init() try this code:

let topWindow = UIWindow(frame: UIScreen.main.bounds)
let storyboard = UIStoryboard(name: "Main", bundle: nil) // Name of storyboard should be same as your
let topViewController = storyboard.instantiateViewController(withIdentifier: identifier) as? BaseViewController // be sure that `identifier` of BaseViewController is same as in storyboard 
topWindow.rootViewController = topViewController
topWindow.windowLevel = UIWindowLevelAlert + 1
let alert = UIAlertController(title: "message", message: "message", preferredStyle: .alert)
let yesButton = UIAlertAction(title: "OK", style: .default, handler: {(_ action: UIAlertAction) -> Void in
    print("you pressed Yes, please button")
    topWindow.isHidden = true
    topViewController.openViewControllerBasedOnIdentifier("consumerProfile")
})
let noButton = UIAlertAction(title: "CANCEL", style: .default, handler: {(_ action: UIAlertAction) -> Void in
    print("you pressed No, thanks button")
    topWindow.isHidden = true
})
alert.addAction(yesButton)
alert.addAction(noButton)

topWindow.makeKeyAndVisible()
topWindow.rootViewController?.present(alert, animated: true, completion: { _ in })

UPDATE 2

There is your identifier = storyboard ID

edited Sep 04 '17 at 16:06

answered Sep 04 '17 at 14:55

Yerken

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How does this change the `rootViewController`? – rmaddy Sep 04 '17 at 14:58
@maddy Forgot to change topWindow.rootViewController = topViewController – Yerken Sep 04 '17 at 15:00
@YerkebulanAbildin can't instantiateViewController, need to use the openViewControllerBasedOnIdentifier method if i want the menu structure. When I tried the code on top the app crashed with "fatal error: unexpectedly found nil while unwrapping an Optional value" – Johny D Good Sep 04 '17 at 15:15
It's becouse you didn't implement init() and your BaseViewController didn't load all @IBOutlets from storyboard. Try code which I provide to you on bottom of answer – Yerken Sep 04 '17 at 15:18
@YerkebulanAbildin Hi. tried to implement the update but baseViewController has no identifier. Its not connected to a specific UIView but to a slider menu – Johny D Good Sep 04 '17 at 16:01
identifier you should put inside your storyboard for your viewController – Yerken Sep 04 '17 at 16:03
@YerkebulanAbildin i use identifiers. Each view has a different identifier but none of the views have this class as Custom Class and Storyboard id. Instead each UIViewController that needs access the the functionality of baseViewController is declared thus: class ContactViewController: BaseViewController but with its own custom class and Identity – Johny D Good Sep 04 '17 at 16:30
@YerkebulanAbildin my app is based on AKSwiftSlideMenu https://github.com/ashishkakkad8/AKSwiftSlideMenu – Johny D Good Sep 04 '17 at 16:31
@JohnyDGood ok, I got it. What is your initial Viewcontroller superclass? And what is class of you initial Viewcontroller – Yerken Sep 04 '17 at 17:20

Receiving error: Value of type 'UIViewController' has no member 'openViewControllerBasedOnIdentifier'

1 Answers1