Question 66786 in IOS Swift Question posted in
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Drag gesture — get position of finger from finger's origin AND allow scrolling in ScrollView – Ios swift

I am trying to get the position of the finger during a drag gesture (from an origin point of where the finger first began the drag). I want to do this while simultaneously allowing for scrolling within a ScrollView.

I can do these independently, but it seems scrolling in a ScrollView prevents the drag gesture.

I have tried adding the .gesture() part of the code below to the Component(), the VStack, and I also tried wrapping all of this in a GeometryReader and adding it to that. Each time, the .gesture() only prints when no scrolling happens (so, it prints when dragging horizontally).

How can I achieve this?

ScrollView {
    VStack(alignment: .center, spacing: 0) {
        ForEach((0..<reports.count), id: .self) {i in
            Component(report: reports[i])
                .offset(y: -(CGFloat(i) * 12.0))
        }
    }
}
.gesture(
    DragGesture()
        .onChanged { value in
            self.position = value.translation
            print(self.position)
        }
        .onEnded { _ in
            self.position = .zero
        }
)
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2

Answers


  1. Chosen as BEST ANSWER
    0

    Thanks to everyone for the suggestions (some of which were deleted by their authors). Unfortunately, as DatBlaueHus states:

    Unfortunately, the Scrollview drag handler kills all simultaneous drag handlers as well, so afaik there is no stable solution for your original issue short of wrapping a UIKit solution for that issue.

    I've solved my issue by using a custom ScrollView implementation. I need to play around with the feel of it — it doesn't scroll quite as smoothly as the stock ScrollView, but it solves my issue and recognises gestures simultaneously.


  2. 0

    this answer might work, but it also seems like a weird workaround.

    worst case you must build your own scrollview, as to have access to all touches and then offsetting stuff so scroll also works..

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