Signature not preserved when Android device is rotated

[mattleibow]

This was originally mentioned here: https://forums.xamarin.com/discussion/68380/signature-in-signature-pad-getting-misplaced-while-changing-screen-orientation

This is most probably related to the Activity lifecycle. The entire view is being destroyed and re-created when the device is rotated. And, we do not save/restore state within the view.

[gtbuchanan]

Same thing happens on iOS. My workaround is to clear the signature on orientation change so I don't end up with an off-screen signature.

[Vladis466]

Im seeing the same issue.

Howeever when navigating to and from the signaturepage (changing from portrait and landscape and back) the behavior I get is the following:

The UI appears as it would in landscape but the overall app appears in portrait (so approximately half the app does not appear on the screen).

[Vladis466]

So I found an interesting work around. I'm using native messaging center to force the portrait landscape thing and this bug would keep occurring no matter where I called it from (primarily using OnAppearing()).

However the UI would fix itself after an action, such as moving to a tabbed view. I was able to get around the UI landscape/portrait bugout by calling the forceLandscape or forcePortrait from my viewmodel before popping/pushing the new page.

Example below:
MessagingCenter.Send((Views.SignaturePage)Navigation.NavigationStack[Navigation.NavigationStack.Count - 1], "forcePortrait");
For this to work you need to get ahold of the current page casted to the correct type. (I exploited the fact that I am passing the navigation to my VM).

[sk1llsh0t]

Any update on this? If a signature was taken in landscape and the device rotates to portrait, the signature gets chopped.