[iOS] Animation stops when you re-open the app from background

[areimche]

🐛 Bug Report

I have a CollectionView with several animations. When I put the app in the background and open it again, the animations stop. This only affects iOS, it works on Android.

This also happens when using a ListView.

Expected behavior

Animations should continue to run after reopening the app from the background.

Reproduction steps

Branch with sample code: https://github.com/areimche/LottieXamarin/tree/test_background_bug

• start the example app
• click on "List Example"
• scroll to bottom
• scroll to top
• leave the app
• reopen the app from background

Configuration

Version: 4.0.9

Platform:

• [ ] :iphone: iOS
• [ ] :robot: Android
• [ ] :checkered_flag: WPF
• [ ] :earth_americas: UWP
• [ ] :apple: MacOS
• [ ] :tv: tvOS
• [x] :monkey: Xamarin.Forms

[4brunu]

In Swift I had the same problem and solved it with the following change. Hope it helps.

animationView.backgroundBehavior = .pauseAndRestore

[areimche]

Sorry, I selected the wrong platform when creating the issue. I have the problem with Xamarin.Forms on iOS. There is no backgroundBehavior for the AnimationView.

[DavidStrachanLexacom]

I think I might have a similar issue, I am using Xamarin.Forms TabView (from Syncfusion). When I navigate to a different tab and back, the animation does not run and is static at the first frame.

Does this sound like the same issue you are facing @areimche ?