Bug 44980 - ActivityIndicator disappears when scrolling
Summary: ActivityIndicator disappears when scrolling
Status: VERIFIED FIXED
Alias: None
Product: Forms
Classification: Xamarin
Component: iOS (show other bugs)
Version: 2.3.2
Hardware: PC Mac OS
: --- normal
Target Milestone: ---
Assignee: Bugzilla
URL:
Depends on:
Blocks:
 
Reported: 2016-10-03 16:07 UTC by Hrafn Loftsson
Modified: 2017-07-18 10:04 UTC (History)
7 users (show)

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

Notice (2018-05-24): bugzilla.xamarin.com is now in read-only mode.

Please join us on Visual Studio Developer Community and in the Xamarin and Mono organizations on GitHub to continue tracking issues. Bugzilla will remain available for reference in read-only mode. We will continue to work on open Bugzilla bugs, copy them to the new locations as needed for follow-up, and add the new items under Related Links.

Our sincere thanks to everyone who has contributed on this bug tracker over the years. Thanks also for your understanding as we make these adjustments and improvements for the future.


Please create a new report on Developer Community or GitHub with your current version information, steps to reproduce, and relevant error messages or log files if you are hitting an issue that looks similar to this resolved bug and you do not yet see a matching new report.

Related Links:
Status:
VERIFIED FIXED

Description Hrafn Loftsson 2016-10-03 16:07:11 UTC
In iOS, an ActivityIndicator, which is a ViewCell in a ListView, disappears when scrolling. When the ViewCell moves off the visible screen area and back in during scrolling, the indicator is no longer visible.

This has been reported before: https://forums.xamarin.com/discussion/62974/activityindicator-disappears-while-scrolling-in-the-listview

I have made a test project which shows this behaviour: https://github.com/KolibriDev/TestLayoutXaml

Note that this is only a problem in iOS - works in Droid and UWP.
Comment 1 adrianknight89 2016-11-01 02:45:25 UTC
I can confirm this issue.

At the moment, I can't figure out what's causing this. A workaround seems to be setting IsRunning to false and then true. Add this to GetCell of ListViewRenderer:

if ((cell as ViewCell).View is ActivityIndicator)
{
    ((cell as ViewCell).View as ActivityIndicator).IsRunning = false;
    ((cell as ViewCell).View as ActivityIndicator).IsRunning = true;
}

Of course, this is not even a hack. If the activity indicator is a child of another element or elements, then you'd need to recursively search for it.
Comment 2 adrianknight89 2016-11-01 07:39:40 UTC
See https://github.com/xamarin/Xamarin.Forms/pull/495
Comment 3 Rui Marinho 2017-04-06 18:27:00 UTC
Should be fixed on 2.3.5-pre1
Comment 5 Paul DiPietro [MSFT] 2017-07-11 18:11:42 UTC
Please upload a reproduction project displaying the issue when running on the 2.3.5-pre6 build.
Comment 6 Saurabh Paunikar 2017-07-18 10:01:48 UTC
fixed on version 2.3.5-pre6.
Comment 7 Saurabh Paunikar 2017-07-18 10:04:00 UTC
Verified on xamarin.form version 2.3.5.256-pre6.
Hence marking this as verified.

ScreenCast link : https://www.screencast.com/t/lEP2M3gyPL