[ios] fix memory leak in SwipeView#16532
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jonathanpeppers merged 1 commit intodotnet:mainfrom Aug 4, 2023
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Context: dotnet#16346 This addresses the memory leak discovered by: src/Core/src/Platform/iOS/MauiSwipeView.cs(20,10): error MA0002: Member '_contentView' could cause memory leaks in an NSObject subclass. Remove the member, store the value as a WeakReference, or add the [UnconditionalSuppressMessage("Memory", "MA0002")] attribute with a justification as to why the member will not leak. src/Core/src/Platform/iOS/MauiSwipeView.cs(21,15): error MA0002: Member '_actionView' could cause memory leaks in an NSObject subclass. Remove the member, store the value as a WeakReference, or add the [UnconditionalSuppressMessage("Memory", "MA0002")] attribute with a justification as to why the member will not leak. src/Core/src/Platform/iOS/MauiSwipeView.cs(18,26): error MA0002: Member '_tapGestureRecognizer' could cause memory leaks in an NSObject subclass. Remove the member, store the value as a WeakReference, or add the [UnconditionalSuppressMessage("Memory", "MA0002")] attribute with a justification as to why the member will not leak. src/Core/src/Platform/iOS/MauiSwipeView.cs(19,26): error MA0002: Member '_panGestureRecognizer' could cause memory leaks in an NSObject subclass. Remove the member, store the value as a WeakReference, or add the [UnconditionalSuppressMessage("Memory", "MA0002")] attribute with a justification as to why the member will not leak. I could reproduce a leak in `MemoryTests.cs`: ++[InlineData(typeof(SwipeView))] public async Task HandlerDoesNotLeak(Type type) Solved the problem by: * Remove the backing field for `MauiSwipeView.Element`. We can use `CrossPlatformLayout`, which is already safe, and just cast to `ISwipeView` instead. * Create a `SwipeRecognizerProxy` type for handling callbacks from gesture recognizers. Other cleanup: * Marked fields `readonly` as Roslyn suggested. * Fixed a place `.Count() > 0` was used where Roslyn suggested to use `.Any()` instead. * `GetIsVisible()` can also be `static` to avoid a closure on `this`: Any(s => this.GetIsVisible(s))
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jsuarezruiz
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Context: #16346
This addresses the memory leak discovered by:
I could reproduce a leak in
MemoryTests.cs:Solved the problem by:
Remove the backing field for
MauiSwipeView.Element. We can useCrossPlatformLayout, which is already safe, and just cast toISwipeViewinstead.Create a
SwipeRecognizerProxytype for handling callbacks from gesture recognizers.Other cleanup:
Marked fields
readonlyas Roslyn suggested.Fixed a place
.Count() > 0was used where Roslyn suggested to use.Any()instead.GetIsVisible()can also bestaticto avoid a closure onthis: