[iOS] Cannot access a disposed object using CollectionView EmptyView

[jsuarezruiz]

Description of Change

Cannot access a disposed object exception using CollectionView EmptyView.

I cannot reproduce the issue neither in the repro sample created, nor using the 5.0.0 branch with the example attached in #12776 (see attached gif). Using Xamarin.Forms 5.0-pre4 can reproduce the issue.@hartez has submitted a few CollectionView fixes recently, but I cannot associate a direct change related to EmptyView that may have fixed the issue. For now, I created this PR as a draft to investigate more.

Issues Resolved

• fixes [Bug] 'Cannot access a disposed object. Object name: 'DefaultRenderer' - on ios with CollectionView and EmptyView #12910
• fixes [Bug] iOS CollectionView Cannot access disposed object. DefaultRenderer #12894

API Changes

None

Platforms Affected

• iOS

Behavioral/Visual Changes

None

Before/After Screenshots

Testing Procedure

Launch Core Gallery and navigate to the issue 12910. Pull to Refresh. Without exceptions, the test has passed.

PR Checklist

• Targets the correct branch
• Tests are passing (or failures are unrelated)

[VladislavAntonyuk]

Thank you @jsuarezruiz for the hot fix. Do you have a Nuget package I can take to check?
XCT has awesome bot for it:

[Mertsch]

For me this issue happens both directly and indirectly.
Directly: Enter view, boom exception
Indirectly: View is displayed correctly. Trying to navigate from view (page) to a different (without CV) then exception.
No idea why, but the issue is gone as soon as I comment EmptyView