xamarin/Xamarin.Forms

[Bug] [iOS] Listview Scrolling does not work when implementing PullAndSwipe gesture

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#6,691 opened on Jun 27, 2019

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a/gestures 🖖a/listviewe/5 :clock5:help wantedinactivep/iOS 🍎t/bug :bug:up-for-grabs

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Description

Description

Listview does not scroll when PullAndSwipe gesture is implemented

Steps to Reproduce

  1. Run the attached app. Attempt to scroll the list. It does not scroll. Attempt to swipe an item, it does swipe.
  2. Edit NotificationListPage.xaml. Remove the PullAndSwipe GestureRecognizer on the StackLayout (lines 86-90)
  3. Run the app again. Now the listview will scroll.
  4. Replace the Gesture and run against Android. The list scrolls and the swipe gesture works.

Expected Behavior

The listview should scroll as it does in Android.

Actual Behavior

The listview does not scroll

Basic Information

  • Version with issue: 4.1.0 pre-2
  • Last known good version: none (tested back to 3.2)
  • IDE:VS2019
  • Platform Target Frameworks:
    • iOS: 10.3
    • Android:
    • UWP:
  • Android Support Library Version:
  • Nuget Packages:
  • Affected Devices:

Screenshots

Reproduction Link

HeaderTest.zip

Contributor guide

Research direction
Investigate the interaction between PullAndSwipe gesture recognizer and ListView scrolling on iOS; check if the gesture is consuming touches preventing scroll.
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.
2
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.Forms
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
70