xamarin/Xamarin.Forms

Forms ListView row animations do not occur

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#5,839 opened on Apr 8, 2019

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a/listviewe/4 :clock4:help wantedp/iOS 🍎t/bug :bug:up-for-grabs

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Description

Description

A simple ListView data-bound to an ObservableCollection should animate with add/remove/move animations on iOS. None of these animations occur however.

Steps to Reproduce

  1. Create a simple project with a ListView bound to an ObservableCollection
  2. Bind a button to an add/remove or move action, where you fire the appropriate INotifyPropertyChanged event
  3. Click the button, watch for the list to repaint

Expected Behavior

ListView should animate similar to how UITableView does

Actual Behavior

No animation whatsoever occurs.

Basic Information

  • Version with issue:
  • Last known good version:
  • IDE: Visual Studio Mac 8.0.1
  • Platform Target Frameworks:
    • iOS: 12.1
  • Forms: 3.6.0.293080

Contributor guide

Research direction
Investigate how ListView renders rows and triggers animations on iOS. Trace the animation initiation when ObservableCollection changes, and check if there's a missing wiring in the iOS renderer.
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.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Fresh
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
GitXamarin.Forms basics
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60