xamarin/Xamarin.Forms

iOS: ContextAction collection changes cause slow-down and eventual freeze

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#2,085 opened on Mar 12, 2018

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a/listviewa/performancee/4 :clock4:help wantedi/highp/iOS 🍎t/bug :bug:up-for-grabs

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Description

Description

Each Change to the ContextActions in a ListView or TableView cause an exponentially increasing UI freeze on iOS.

Steps to Reproduce

  1. Create a ViewCell with context actions
  2. Repeatedly change the context actions in some way (usually based on ViewCell/ViewModel state)

Expected Behavior

Context Menu (swipe left on iOS, hold on Android, right-click on UWP, etc) should reflect this change immediately with no UI slow down.

Actual Behavior

On iOS, on every change, the UI gets slower and slower to respond till it eventually freezes indefinitely.

Basic Information

  • Version with issue: 2.5.0.280555
  • IDE: Visual Studio 2017
  • Platform Target Frameworks:
    • iOS: 11.8.0.20
  • Devices: Tested on iPhone 6 Plus

Video

https://github.com/sonic1015/bugRepo/files/1835039/2018-03-12.T16-17-07.zip

Reproduction Link

https://github.com/sonic1015/bugRepo/archive/1.zip

Contributor guide

Research direction
Inspect the iOS renderer for ContextActions in Xamarin.Forms to identify why repeated changes cause exponential slowdown and eventual freeze. Look for memory leaks or unnecessary invalidation in the UIContextualAction collection handling.
Tech stack
csharp
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.
1-3 hours
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.
Clear
Prerequisites
C#iOS development
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50