GlassLargeTitle class

A sliver widget that renders a large 34pt iOS 26 navigation title (and optionally an inline search bar) which collapse smoothly as the user scrolls.

Drop it as the first sliver in your CustomScrollView. Pair with GlassLargeTitleController and pass the same controller to GlassAppBar.largeTitleController to automatically cross-fade the inline bar title.

iOS 26 fidelity

• Typography: 34pt, w700, -0.5 letter-spacing — exact iOS 26 spec.
• Two-phase collapse: Large title fades first (Phase 1), then the search bar collapses under the nav bar (Phase 2) — matching iOS 26's UINavigationItem.searchController behaviour.
• Fade curve: Curves.easeIn on title, Curves.easeIn on search bar.
• Overscroll stretch: Title scales up slightly on rubber-band pull, matching iOS 26's UINavigationBar large-title elastic stretch.
• Self-measuring: Reports rendered heights to the controller after first layout — correct collapse timing under all Dynamic Type settings.
• iPhone Duo: In the vertical bar strip (GlassVerticalBar) the title leaves the scroll view for the title row at the top of the content, at 28pt in its large weight, where the GlassAppBar.pinned sharing the controller draws it. This sliver keeps its place, so the content below starts where it does natively, and the row scrolls away with it. A searchBar becomes a magnifier at the bottom of the strip; see searchBar.

Basic usage — title only

GlassLargeTitle(
  text: 'Chats',
  controller: _titleController,
)

With search bar — two-phase iOS 26 collapse

GlassLargeTitle(
  text: 'Messages',
  controller: _titleController,
  searchBar: GlassSearchBar(
    placeholder: 'Search',
    onChanged: (v) => _filter(v),
  ),
)

With trailing widget (avatar, action button)

GlassLargeTitle(
  text: 'Listen Now',
  controller: _titleController,
  trailing: CircleAvatar(child: Text('SD')),
)