Failing to instantiate initial view controller programmatically

Asked Aug 12 '18 at 01:07

Active Aug 12 '18 at 05:56

Viewed 451 times

I am running an XCTest where I am trying to instantiate a UINavigationController as the initialViewController but it is giving me the following error:

Could not cast value of type 'ToDo.ItemListViewController' (0x10cce7208) to 'UINavigationController' (0x10f93ced8)

The ItemListViewController is embedded within the Navigation Controller, and "Is Initial View Controller" is selected for the Navigation Controller. This is exactly how I'm instructed to do this by a tutorial... perhaps I have another setting interfering? Here is my code

func test_InitialViewController_IsItemListViewController() {
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    let navigationController =
        storyboard.instantiateInitialViewController() as! UINavigationController
    let rootViewController = navigationController.viewControllers[0]
    XCTAssertTrue(rootViewController is ItemListViewController)
}

Screenshot for reference:

asked Aug 12 '18 at 01:07

Pigpocket

1

That's very odd. I'm able to make a similar structure, but get the results you expect. This leads me to believe that something may be strangely wrong with your storyboard. What happens if you delete the navigation controller and re-embed the Item List VC in a new navigation controller? – Jon Reid Aug 12 '18 at 01:45
I’ve tried that a number of times with the same result – Pigpocket Aug 12 '18 at 01:48
Looks good. Are you using Xcode 9 or 10? – dasdom Aug 14 '18 at 21:22
@dasdom XCode 9.2 – Pigpocket Aug 14 '18 at 21:41
This looks like it’s from my book. Can you compress the project and send to dasdom@swiftandpainless.com. Then I’ll have a look. – dasdom Aug 14 '18 at 21:58
Absolutely! Coming right up. Thanks for the help. – Pigpocket Aug 14 '18 at 22:00

Failing to instantiate initial view controller programmatically

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