SwiftUI Long Press Progress View

LongPressProgress.swift

// Using `.updating(...)` with a @GestureState seemed like the way to go
// but pressing state end update is not readily available
// standard `.onLongPress` modifier works best 

struct LongPressExample: View {
  let duration: TimeInterval
  @State private var progress: CGFloat = 0
  @State private var isDone = false

  var body: some View {
    ZStack {
      Circle()
        .foregroundColor(.purple)
      Circle()
        .trim(from: 0, to: progress)
        .stroke(Color.green, style: StrokeStyle(lineWidth: 5, lineCap: .round))
    }
    .onLongPressGesture(minimumDuration: duration) { pressing in
      print("pressing: \(pressing)")
      if pressing {
        withAnimation(.easeIn(duration: duration)) {
          progress = 1
        }
      } else {
        withAnimation(.easeIn(duration: duration/5.0)) {
          progress = 0
        }
      }
    } perform: {
      print("done")
      progress = 1
      isDone = true
    }

    Text(isDone ? "Done" : "Press Button")
  }
}