Bug 58289 - UI displays different views than visible in modal stack
Summary: UI displays different views than visible in modal stack
Status: CONFIRMED
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS ()
Version: unspecified
Hardware: PC Mac OS
: Normal normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2017-07-21 08:32 UTC by arno.schneider
Modified: 2017-07-28 02:58 UTC (History)
3 users (show)

Tags: pushmodalasync, ac
Is this bug a regression?: ---
Last known good build:


Attachments
Example project (16.33 KB, application/zip)
2017-07-21 08:32 UTC, arno.schneider
Details


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Status:
CONFIRMED

Description arno.schneider 2017-07-21 08:32:15 UTC
Created attachment 23707 [details]
Example project

I discovered a situation with Xamarin Forms and iOS I feel is not ideal:

Example project pushes three modal views shortly after each other with the following results:
-> ModalPushing is called three times, ModalPushed only two times
-> there are three DIFFERENT views in the modal stack
-> there are three views displayed on the iPad, but the second and third view are IDENTICAL
-> if you manually pop the top view you see the identical view below it (so there are three views displayed and not only two but ModalPushed is never called a third time)
-> if you try to pop the top view with an awaited PopModalAsync any code after it won't be executed, if you pop it without await code after it is executed

I know that in this example project I could just easily await the PushModalAsync, but I discovered the situation in a different context and I feel that situation should never occur at all.
Comment 1 Paul DiPietro [MSFT] 2017-07-21 16:51:58 UTC
I don't believe this is necessarily an iOS exclusive issue, but it at least occurs with the nightly build as well.