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[iOS] Changing swipe direction flickers

See original GitHub issue

Environment

iPhone 11 iOS: 14.4 Example app

Description

When swiping on Android back and fort the position stays the same and the offset is changing only. Example:

[Wed Apr 14 2021 08:27:02.615]  LOG      Position: 1 Offset: 0.023148147389292717  // swiping left 
[Wed Apr 14 2021 08:27:02.787]  LOG      Position: 1 Offset: 0.02500000037252903 // swiping left
[Wed Apr 14 2021 08:27:02.820]  LOG      Position: 1 Offset: 0.02777777798473835 // swiping left
[Wed Apr 14 2021 08:27:05.399]  LOG      Position: 1 Offset: 0.02500000037252903 // swiping right
[Wed Apr 14 2021 08:27:05.433]  LOG      Position: 1 Offset: 0.023148147389292717 // swiping right

When swiping on iOS back and fort both the position and the offset is changing. Example:

[Wed Apr 14 2021 08:30:40.408]  LOG      Position: 1 Offset: 0.047101449221372604 // swiping left 
[Wed Apr 14 2021 08:30:40.435]  LOG      Position: 1 Offset: 0.050724636763334274 // swiping left 
[Wed Apr 14 2021 08:30:41.305]  LOG      Position: 0 Offset: 0.9504830837249756  // swiping right
[Wed Apr 14 2021 08:30:41.326]  LOG      Position: 0 Offset: 0.9528985619544983 // swiping right
[Wed Apr 14 2021 08:30:41.345]  LOG      Position: 0 Offset: 0.95652174949646 // swiping right

This behaviour messes up the animation. iOS should behave like android Heres a video that shows the bug, just watch the bottom paginating circles.

https://user-images.githubusercontent.com/50402950/114665627-8f505e80-9cfd-11eb-8dd0-eb90c59e44d0.mp4

Reproducible Demo

Just run the example app of this repo. Start swiping left/right then change the direction.

Issue Analytics

State:
Created 2 years ago
Reactions:5
Comments:13 (7 by maintainers)

Top GitHub Comments

2reactions

elkinjosetmcommented, May 27, 2021

I would keep the overdrag enabled by default on iOS, because that’s a default behaviour on iOS.

I theory, returning only position -1 on the onPageScroll when is dragging to the left from the first page makes sense, since dragging to the any other page, from any page different than 0, will return the “upcoming” position.

2reactions

adwidianjayacommented, May 11, 2021

Same here, swipe back giving inconsistent position on iOS. I’ve tried change the version since 5.1.0 but always got the same behaviour.