badoo/Chatto

Visual bugs when changing many item's heights

Open

#614 opened on Oct 2, 2019

View on GitHub
 (0 comments) (0 reactions) (0 assignees)Swift (4,166 stars) (561 forks)batch import
bughelp wanted

Description

When updating heights of multiple items (18 items in my example), I've got a visual bug - flickering effect with new (updated) items are flowing up from the bottom of collection and moving to some top position beyond the screen. I attached video when you can see it if you will look frame-by-frame. I also attached a screenshot of the middle state of this animation.

Video: Screen Recording 2019-10-02 at 18.08.22.mov.zip

Contributor guide

Tech stack
swift
Domain
mobile
Issue type
bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
stale
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
mostly clear
Prerequisites
SwiftiOS developmentChatto frameworkUICollectionView
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30
Research direction
The issue describes a flickering effect when updating heights of multiple items in a chat collection. Investigate the layout and animation code in Chatto, particularly around height changes and the collection view's batch updates. Look at the Chatto framework's collection view layout implementation to identify potential causes of the flickering. Since the issue is from 2019 and unaddressed, consider updating dependencies or testing with newer iOS versions.