Unbalanced calls to begin/end transition warning when using TabBar

[lukasburns]

Hi, ive managed to hook up RxFlow to my proyect which currently has an AppFlow which shows a MainFlow, but im getting a warning Unbalanced calls to begin/end appearance transitions for <UIViewController: 0x7fc7e77079f0>

AppFlows's root is a UINavigationController while MainFlow's root is a UITabBarController with 3 tabs( 1 flow for each tab ). The code on my navigateToMain in MainFlow is as follows

Flows.whenReady(
      flow1: recipesFlow,
      flow2: cookFlow,
      flow3: settingsFlow) { [unowned self] (root1, root2, root3) in

    ... configure tab bar items...

      self.rootViewController.setViewControllers([root1, root2, root3], animated: false)
    }

    return .multiple(flowContributors: [
      .contribute(
        withNextPresentable: recipesFlow,
        withNextStepper: OneStepper(withSingleStep: KitchenConnectStep.recipesAreRequired)),
      .contribute(
        withNextPresentable: cookFlow,
        withNextStepper: OneStepper(withSingleStep: KitchenConnectStep.cookIsRequired)),
      .contribute(
        withNextPresentable: settingsFlow,
        withNextStepper: OneStepper(withSingleStep: KitchenConnectStep.settingsAreRequired))
    ])

it seems to have something to do with presenting one view controller before the other has completely loaded, but i cant figure out how to make this warning dissapear.

Have you encountered a similar warning?

thanks

btw: Great Library!

[twittemb]

Hi @lukasburns

Can you share the whole project ?

Thanks.

[twittemb]

Hi @lukasburns

I remember a workaround I had to use for such a message in the RxFlow Demo Application: Take a look at the DispatchQueue.main.async

    Flows.whenReady(flow1: onboardingFlow) { [unowned self] root in
        DispatchQueue.main.async {
            self.rootViewController.present(root, animated: true)
        }
    }

Not sure it will help. Please note this is a workaround and should not have to be done but I have to dig further to make it right.

[bryan-vh]

Any update on this, for some reason I can't even present another view controller on top of a root view controller that is a UIViewController without the error: Warning: Attempt to present <UIViewController: 0x10750e8e0> on <UIViewController: 0x1075d3480> whose view is not in the window hierarchy!

[twittemb]

Hi @bryan-vh

can you share your flows ?

thanks.

[PierreBrisorgueil]

hello @twittemb I'm working on a stack and I have the same concerns. As there was no feedback to reproduce the bug it is reproducible on my stack.

https://github.com/weareopensource/Swift

• email: [email protected]
• password: TestWaos@2019

produced in navigationToDashboardScreen() or navigateToDashboard(), I'm digging into the subject a bit, but I haven't found a solution yet. DispatchQueue.main.async seems not to work.

(beginner in swift)

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