[iOS] Fix ScrollView does not resize when children are removed from StackLayout at runtime #32267
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jsuarezruiz
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Oct 31, 2025
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Did you make tests around the performance?
Every LayoutSubviews() call triggers parent invalidation. Rotate device, etc.
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It would be very helpful if you could test the resulting artifacts from this PR and let us know in a comment if this change resolves your issue. Thank you!
Issue Details
When removing children from a ScrollView that contains a StackLayout, the ScrollView does not resize correctly and leaves blank space at the bottom.
Root Cause
In MauiScrollView.LayoutSubviews(), when removing children, during the first layout pass the current ScrollView size is returned from CrossPlatformMeasure.
Because of this, InvalidateAncestorMeasures() is not triggered, and the layout does not update as expected.
Description of Change
Modified the logic to ensure that whenever a frame change occurs, InvalidateAncestorMeasures() is invoked.
This ensures that the layout updates correctly, resolving the resizing issue when children are removed from the ScrollView.
Issues Fixed
Fixes #32221
Tested the behavior in the following platforms.
Before.mov
After.mov