Problem with dragging several cells at same time

[HaidenTenno]

Hi! Your lib works perfectly for my app, but i noticed strange behavior:

I need to show button only for single cell per time, and SwipeState property works good, but if you swipe multiple cells at same time, then several cells remain open.

RPReplay_Final1673530851.mp4

Is it a bug, or feature?
Thank you!

[c-villain]

@HaidenTenno Petr, hi! Thx for sharing! That's interesting question! How do u think the behaviour should be?🤔

[HaidenTenno]

Something like telegram or whatsapp have in chat list (it's just not possible to swipe several items at same time 😅)

[c-villain]

@HaidenTenno sounds good! Actually you can disable multitouch drag or you have to support multitouch, haven't you?...
All in all that's really good notice! I'll try to found some decision)

[HaidenTenno]

Yeah I don't know why, but that solution does not solve the problem for me =(
Thanks a lot!

[c-villain]

@HaidenTenno I've just checked this decision. It works fine!

You should set

UIView.appearance().isMultipleTouchEnabled = false
UIView.appearance().isExclusiveTouch = true

e.g. in onAppear for ur RootView

Check this out!

[HaidenTenno]

@c-villain Hm, I don't know, but it does nothing for me 😅

The comment below answer said it's about multi touch, not multi drag gesture

I've published a sample app, if you interest:
https://github.com/HaidenTenno/MultipleCellSwipeProblem

[c-villain]

@HaidenTenno yeah! Thx for sharing!🤝

[c-villain]

@HaidenTenno FYI

Due to SwiftUI philosophy is not quite possible to control multi touching in general and dragging several cells particularly. Anyway we can disable multitouch using UIKit by adding exclusive touch flag ... For this one in the release 0.4.0 of this SPM you can add special view modifier: .allowMultitouching(false) to your view strictly before using swipe actions:

...
YourView(...)
      .allowMultitouching(false) // <= look here
      .addSwipeAction( ...) {
        ...
      }
...

By default this flag is true. Using this modifier will repeat telegram's behaviour where you can drag only one cell during multitouching.

Actually the problem exist only in fullswiping mode. In default mode you can drag several cells but after ending touching only one will be opened.

But as soon as this solution is based on UIKit you can't optimise rendering of YourView with drawingGroup():

...
YourView(...)
      .allowMultitouching(false) // <= look here
      .addSwipeAction( ...) {
        ...
      }
      .drawingGroup() // <=  ❌ DON'T DO THAT
...

You'll definitely get this:

Actually rendering will be optimizing by SwiftUI engine... For full control you can add view modifier .identifier(your id) to YourView(...)

[c-villain]

fix in 0.4.0