fix(ios): animate sheet back to detent on keyboard dismiss

[TheOmran]

Bug

When using custom detents (especially 'auto'), dismissing the keyboard causes the sheet to snap back to its detent position instead of smoothly animating the transition. This affects any sheet with text inputs that uses custom or auto-sized detents.

Root Cause

TrueSheetKeyboardObserver checks isFirstResponderWithinSheet before forwarding keyboardWillChangeFrame: notifications to delegates. When the keyboard hides, the first responder has already resigned by the time the notification fires, so the check returns NO and the hide event is silently dropped.

Without the hide event being forwarded, UISheetPresentationController recalculates the custom detent position without being wrapped in an animateChanges: block, causing the snap instead of a smooth animation.

Fix

1. Track keyboard state per sheet — Added _wasShowingForSheet flag to TrueSheetKeyboardObserver. When the keyboard shows for this sheet, the flag is set. On keyboard hide, the first-responder check is skipped if the flag was set (then reset), ensuring the hide event is always forwarded when the keyboard was previously shown for this sheet.

2. Forward keyboard hide to the sheet — Registered TrueSheetContainerView as a keyboard observer delegate. On keyboardWillHide:, it notifies the delegate via a new optional containerViewKeyboardWillHide method.

3. Force animated detent reconfiguration — TrueSheetView implements containerViewKeyboardWillHide by calling setupSheetDetentsForSizeChange, which wraps the detent reconfiguration in [sheet animateChanges:], forcing UIKit to animate the transition back to the custom detent.

Files Changed

• ios/core/TrueSheetKeyboardObserver.mm — State tracking for keyboard show/hide per sheet
• ios/TrueSheetContainerView.h — New optional delegate method
• ios/TrueSheetContainerView.mm — Keyboard observer delegate implementation
• ios/TrueSheetView.mm — Animated detent reconfiguration on keyboard hide

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[TheOmran]

@lodev09 🙏🏼

[lodev09]

@TheOmran do you have a video showing before/after?