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[ios] fix memory leak in Border #15946

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Jun 30, 2023
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Context: #14664
Context: https://github.com/nacompllo/MemoryLeakEverywhere/tree/bugfix/memoryLeakItemsSource

While looking at the customer sample, we found an issue with BorderHandler:

  • ContentView -> via LayoutSubviewsChanged
  • BorderHandler ->
  • ContentView

Creating a cycle & memory leak on iOS and Catalyst. We could reproduce this in a device test.

It appears the event only did this:

void OnLayoutSubviewsChanged(object? sender, EventArgs e)
{
    PlatformView?.UpdateMauiCALayer();
}

And so instead, we can just call the extension method directly:

this.UpdateMauiCALayer();

And the leak is gone!

We are not sure if #14664 will be fully solved by this change, but it is one issue in the sample.

Context: dotnet#14664
Context: https://github.com/nacompllo/MemoryLeakEverywhere/tree/bugfix/memoryLeakItemsSource

While looking at the customer sample, we found an issue with
`BorderHandler`:

* `ContentView` -> via `LayoutSubviewsChanged`
* `BorderHandler` ->
* `ContentView`

Creating a cycle & memory leak on iOS and Catalyst. We could reproduce
this in a device test.

It appears the event only did this:

    void OnLayoutSubviewsChanged(object? sender, EventArgs e)
    {
        PlatformView?.UpdateMauiCALayer();
    }

And so instead, we can just call the extension method directly:

    this.UpdateMauiCALayer();

And the leak is gone!

Co-authored-by: Haritha Mohan <harithamohan@microsoft.com>
@jonathanpeppers jonathanpeppers added platform/iOS 🍎 legacy-area-perf Startup / Runtime performance labels Jun 30, 2023
@jonathanpeppers jonathanpeppers marked this pull request as ready for review June 30, 2023 18:21
@PureWeen PureWeen merged commit d211b85 into dotnet:main Jun 30, 2023
@jonathanpeppers jonathanpeppers deleted the iOSBorderLeak branch July 1, 2023 00:17
@jonathanpeppers jonathanpeppers added memory-leak 💦 Memory usage grows / objects live forever (sub: perf) and removed legacy-area-perf Startup / Runtime performance labels Jul 12, 2023
@github-actions github-actions bot locked and limited conversation to collaborators Dec 8, 2023
@samhouts samhouts added the fixed-in-8.0.0-preview.7.8842 Look for this fix in 8.0.0-preview.7.8842! label Aug 2, 2024
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5 participants