React Native ScrollView Bug Fixed by Constraining Viewport Height in Modal

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A React Native developer discovered that a ScrollView inside a share-preview modal failed to scroll when months had many scheduled events, pushing the share button off screen. The root cause was not scroll configuration but an unconstrained viewport: the outer modal sheet used a percentage-based maxHeight while the inner ScrollView used flex:1, leaving it unable to determine available height. The fix involved retrieving the screen height via useWindowDimensions and calculating a precise pixel-based maxHeight for the preview area, subtracting space occupied by fixed UI elements. Crucially, only the on-screen viewing area was constrained — the underlying captured image still exported the full, unclipped schedule. The case highlights that a ScrollView requires both overflowing content and a definitively bounded ancestor container to function correctly.

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ProgrammingDEV Community ·

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