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Correct App behavior when TouchId/MarshMallow authentication fails

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Currently I have App creating a LoadingPage, and onAppearing I want to use Touch-id and MarshMallow Credential before continuing with the app; my question is, what to do if the authorization fails.

Ideally, I should really terminate the app if such event happens. Now knowing that Terminating is frowned upon, what's my best option?

A popular iOS app GoodReader; with Touch enabled, on launch, it shows the touch auth prompt; Cancelling or failing that shows me iOS home screen; GoodReader is still shown on TaskBar, and selecting it shows the auth prompt back again.

Thanks in advance.


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