# bryankeller/BLKFlexibleHeightBar

Create condensing header bars like those seen in the Facebook, Square Cash, and Safari iOS apps.

Repository: https://github.com/bryankeller/BLKFlexibleHeightBar
Canonical: https://ross.abutalabs.com/products/blkflexibleheightbar
Language: Objective-C
License: MIT
License Family: permissive
Last push: 2019-05-09T03:53:33+00:00

## Health v2 (maintenance only)
Score: 32/100 (v2, computed 2026-09-02T17:46:02.011165+00:00)
- activity 0, release rhythm 35, longevity 100
- inputs: {"age_days": 4195, "days_push": 2673, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: no_releases
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 3067, forks 338 (observed 2026-08-28T04:07:41.450198+00:00)

## What it is
An Objective-C iOS library for building condensing, flexible-height header bars like those in Facebook, Square Cash, and Safari. Subview appearance and scroll-linked behaviors are defined modularly via a progress property and behavior definer classes.

## Use cases
- create a shrinking header bar while scrolling a table view
- emulate the Facebook app's collapsing header behavior
- hide chrome to make room for content as the user scrolls
- build a Safari-style condensing navigation bar
- animate subview frames, transforms, and alpha based on bar height

## When to choose
- you're building an iOS app in Objective-C or Swift and want Facebook/Safari-style collapsing headers
- you need fully customizable, modular scroll-linked header behaviors
- you want a mature MIT-licensed UIKit component installable via CocoaPods

## When to avoid
- you're targeting SwiftUI-first architectures and want native solutions
- you need Android or cross-platform support
- you need a library with frequent recent updates and active maintenance

## Facets
- artifact type: library
- maturity: maintenance
- function: ui-components, animation, state-management
- domain: mobile-development, frontend, cross-platform
- platform: -
- tags: objective-c, uikit, header-bar, scrolling-ui, cocoapods, ios, mobile

## Member repositories
- bryankeller/BLKFlexibleHeightBar (main) score 32

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:07:41.450198+00:00.
- Health v2: computed from the inputs above; adoption is never an input.
- Inferred fields (summary, facets, guidance): AI-extracted, prompt v1, taxonomy v1, on 2026-08-29T18:46:38.242027+00:00, confidence not recorded.
  - readme: https://github.com/bryankeller/BLKFlexibleHeightBar (fetched 2026-08-28T04:07:41.450198+00:00, sha cecfa5a07731)
- Data as of 2026-08-30T08:39:29.467469+00:00.