xamarin/Xamarin.Forms

[iOS] Cells aren't highlighted on touch-down when the ListView's CachingStrategy is set to "RecycleElement"

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#3,320 opened on Jul 17, 2018

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Description

Description

On iOS, cells aren't highlighted on touch-down when the ListView's CachingStrategy is set to RecycleElement. Works fine on Android and with RetainElement.

Steps to Reproduce

  1. Create a list and set the CachingStrategy to RecycleElement
  2. Press down on a cell and don't move the finger

Expected Behavior

The cell should highlight like it does when using RetainElement.

Actual Behavior

The cell is highlighted (default grey color) only on touch-up when ItemSelected event is also triggered.

Basic Information

  • Version with issue: Xamarin.Forms 3.1.0.637273
  • Last known good version: it's an older issue
  • IDE:
  • Platform Target Frameworks:
    • iOS: 11.4

Reproduction Link

TouchUpHighlight.zip

Contributor guide

Research direction
Locate the iOS renderer for ListView (e.g., ListViewRenderer) and investigate touch event handling when CachingStrategy is RecycleElement. Compare with RetainElement to find the missing highlight logic. Test on a simulator or device.
Tech stack
csharpios
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.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
C#Xamarin.FormsiOS
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
40