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fix: complete non-zero initialScrollIndex on iOS without waiting for native scroll events #500

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fix: complete non-zero initialScrollIndex on iOS without waiting for native scroll events #500

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08c84df
fix: complete non-zero initialScrollIndex on iOS without waiting for …
erank-pixel Jul 15, 2026
bfd2897
fix: only trust dispatched initial offsets on iOS for plain, in-range…
erank-pixel Jul 15, 2026
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12 changes: 11 additions & 1 deletion src/core/checkFinishedScroll.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -63,12 +63,22 @@ function shouldFinishInitialScrollWithoutNativeProgress(state: StateContext["sta
return false;
}

if (state.initialScrollSession?.kind === "bootstrap") {
// On iOS an unanimated initial scrollTo/contentOffset does NOT emit a
// scroll event, so gating completion on observing native scroll progress
// deadlocks: the fallback loop re-issues scrollTo to the same offset
// (which again emits nothing) until the watchdog gives up seconds later —
// all while the list is held at opacity 0. When state.scroll and
// state.scrollPending already match the target (checked below), the
// unanimated dispatch has been applied synchronously and it is safe to
// finish without native progress. Other platforms emit the event and keep
// the stricter gate.
if (Platform.OS !== "ios" && state.initialScrollSession?.kind === "bootstrap") {
return false;
}

const targetOffset = scrollingTo.targetOffset ?? scrollingTo.offset;
if (
Platform.OS !== "ios" &&
initialScrollWatchdog.hasNonZeroTargetOffset(targetOffset) &&
initialScrollCompletion.didDispatchNativeScroll(state) &&
!state.hasScrolled
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