Description

I'm working on an app for iOS. The app creates new instances of pages and view models every time a new page is pushed to the navigation stack. After a while the app gets very slow and crashes.
So I started to comment out parts of XAML and to trigger GC and found that the pages were no longer cleaned up if they had certain controls.

To find out which controls causes problems I created a simple test programme that does nothing more than adding one single control to a page and pushes that page onto the navigation stack. By clicking a button the garbage collector can be forced to work. The program outputs a debug message when the constructor and finaliser of the opened page is called.

On iOS there are many controls where there is no finaliser call of the page, resulting in memory leaks.

On iOS there is no finaliser log output (~xxx Page) for these controls:

• BoxView: [ios] fix memory leaks in various controls #18434
• Frame: [ios] fix memory leak in Frame, VisualElementRenderer #18552
• Ellipse: [ios] fix memory leaks in various controls #18434
• Line: [ios] fix memory leaks in various controls #18434
• Path: [ios] fix memory leaks in various controls #18434
• Polygon: [ios] fix memory leaks in various controls #18434
• Polyline: [ios] fix memory leaks in various controls #18434
• Rectangle: [ios] fix memory leaks in various controls #18434
• ImageButton: [ios] fix memory leak in ImageButton #18602
• RadioButton RadioButton is not currently being Garbage Collected #20023
• SearchBar: [ios] fix memory leak in SearchBar #16383
• Slider: [ios] fix memory leak in Slider #18681
• Stepper: [ios] fix memory leak in Stepper #18663
• Switch: [ios] fix memory leak in Switch #18682
• ActivityIndicator: [ios] fix memory leaks in various controls #18434
• CarouselView: [controls] fix memory leak with CarouselView & INotifyCollectionChanged #18267
• IndicatorView: [ios] fix memory leaks in various controls #18434
• ListView ListView is not currently being Garbage Collected #20025
• TableView: [ios] fix memory leak in TableView #18718

On Windows there is no finaliser log output (~xxx Page) for these controls:

• WebView: [windows] fix memory leak in WebView #18810

On Android there is no finaliser log output (~xxx Page) for these controls:

• CarouselView: [android] fix memory leak with CarouselView #18584

Steps to Reproduce

1. Clone repository.
2. Run App.
3. Press any button to open a new page.
4. Notice "xxx Page" output (output from constructor).
5. Navigate back.
6. Press button "GC.Collect"
7. Notice "~xxx Page" output (output from finaliser)

Link to public reproduction project repository

https://github.com/heyThorsten/GCTest

Version with bug

8.0.0-rc.2.9373

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

iOS, Android, Windows

Affected platform versions

iOS 16.4 (Simulator), Android 10.0 (Emulator), Windows 10.0.19041.0

Did you find any workaround?

No response

Relevant log output

JUST AN EXAMPLE (WebView Page finaliser call is missing):
Label Page
ScrollView Page
WebView Page
Ellipse Page
GC.Collect()
GC.Collect()
~Ellipse Page
~Label Page
~ScrollView Page