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ios - Pop to root view controller from modal

I am trying to pop to the root view controller using the following code:

self.navigationController!.popToRootViewController(animated: true)

This usually works, but I get an error when trying to use this code when the current view is a modal. How do I go about popping back to the root view controller in this situation?

Thanks in advance.

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You can check that current controller is presented, if it is presented then dismiss it and the go to the rootViewController other wise go directly the rootViewController

if self.presentingViewController != nil {
    self.dismiss(animated: false, completion: { 
       self.navigationController!.popToRootViewController(animated: true)
    })
}
else {
    self.navigationController!.popToRootViewController(animated: true)
}

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