Example of making a reusable `draggable()` modifier for SwiftUI Views

DraggableView.swift

struct DraggablePita: View {
  var body: some View {
    Image(uiImage: UIImage(named: "pita.png")!)
      .draggable() // Add the new, custom modifier to make this draggable
  }
}

// Handle dragging
struct DraggableView: ViewModifier {
  @State var offset = CGPoint(x: 0, y: 0)

  func body(content: Content) -> some View {
    content
      .gesture(DragGesture(minimumDistance: 0)
        .onChanged { value in
          self.offset.x += value.location.x - value.startLocation.x
          self.offset.y += value.location.y - value.startLocation.y
      })
      .offset(x: offset.x, y: offset.y)
  }
}

// Wrap `draggable()` in a View extension to have a clean call site
extension View {
  func draggable() -> some View {
    return modifier(DraggableView())
  }
}