# lkzhao/ElasticTransition

A UIKit custom transition that simulates an elastic drag. Written in Swift.

Repository: https://github.com/lkzhao/ElasticTransition
Canonical: https://ross.abutalabs.com/products/elastictransition
Language: Swift
License: MIT
License Family: permissive
Last push: 2020-05-10T18:37:32+00:00

## Health v2 (maintenance only)
Score: 23/100 (v2, computed 2026-09-03T02:20:16.233290+00:00)
- activity 0, release rhythm 8, longevity 100
- inputs: {"age_days": 3913, "days_push": 2306, "days_rel": null, "gap_med": null, "n_releases_24m": 0}
- flags: none
- formula: round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)

## Adoption (not part of the score)
Stars 2162, forks 172 (observed 2026-08-28T04:06:21.025285+00:00)

## What it is
A Swift library providing a UIKit custom modal transition that simulates an elastic drag effect with configurable stiffness, damping, and edge curvature. It supports both static and interactive transitions on iOS 8+.

## Use cases
- add elastic drag modal transitions to an iOS app
- create bouncy custom view controller transitions in UIKit
- implement interactive edge-drag modal presentation
- customize modal transition stiffness and damping in Swift
- make a side menu with elastic drag animation

## When to choose
- you need a polished elastic modal transition in a UIKit app
- you want interactive drag-to-dismiss behavior with spring physics
- your project targets iOS 8+ with Swift 3 or later

## When to avoid
- you are building with SwiftUI and want native transitions
- you need actively maintained software - the last release was 2020
- your project requires Swift versions or APIs beyond Swift 3 era conventions

## Facets
- artifact type: library
- maturity: maintenance
- function: animation, ui-components
- domain: mobile-development, frontend
- platform: -
- tags: uikit, custom-transition, modal-transition, elastic-drag, interactive-animation, cocoapods, ios, swift, mobile

## Member repositories
- lkzhao/ElasticTransition (main) score 23

## Provenance
- Observed fields: from GitHub, fetched 2026-08-28T04:06:21.025285+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 2026-08-30T02:50:14.448249+00:00, confidence not recorded.
  - readme: https://github.com/lkzhao/ElasticTransition (fetched 2026-08-28T04:06:21.025285+00:00, sha 0dd353b8e2ed)
- Data as of 2026-08-30T08:39:29.467469+00:00.