swipeCell.swift

struct SwipeCell: View {
    
    @State var buttonsWidth: CGFloat = 0
    @State var cellContentOffset: CGFloat = 0
    @GestureState var dragState:DragGesture.Value? = nil
    
    var body: some View {
        GeometryReader { geometry in
            HStack {
                Rectangle().frame(height:120).foregroundColor(.purple).cornerRadius(7)
                    .gesture(DragGesture().updating($dragState) { dragValue, dragState, _ in
                    dragState = dragValue
                    }.onChanged { value in
                        let distance = value.translation.width
                        let midPoint = geometry.size.width * 0.5
                        let isOpening = distance < 0 ? true : false
                        if isOpening {
                            buttonsWidth = min(abs(distance),midPoint)
                            cellContentOffset = -pow(buttonsWidth, 0.5)
                            buttonsWidth += pow(buttonsWidth, 0.6)
                        } else {
                            buttonsWidth = min(distance, 0)
                        }
                    }.onEnded { _ in
                        if buttonsWidth > (geometry.size.width * 0.25) {
                            buttonsWidth = geometry.size.width * 0.5
                        } else {
                            buttonsWidth = 0
                        }
                        cellContentOffset = 0
                    }).overlay(Text("Swipe Cell").offset(x: cellContentOffset, y: 0))
                HStack(spacing:0) {
                    Rectangle().foregroundColor(.blue).overlay(Image(systemName: "trash").foregroundColor(.white)).onTapGesture {
                        buttonsWidth = 0
                    }
                    Rectangle().frame(width: 5).foregroundColor(.white)
                    Rectangle().foregroundColor(.red).overlay(Image(systemName: "heart").foregroundColor(.white)).onTapGesture {
                        buttonsWidth = 0
                    }
                }.frame(width:buttonsWidth, height:120).cornerRadius(7)
            }.padding()
        }.animation(.spring())
    }
}

I'm sure can be simplified. I added a bit of a rubber banding once you cross the midpoint on opening, and slightly offset the text in the cell.

Next I'll mask the rectangle so the text is clipped correctly...