Distributing Swift Scripts

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• SwiftUI, apply drawGesture only when over Image

  I'm try to apply the gesture only when the user is over the Image display not when tapped outside the image.

  Any suggestion how I can do? this following code draw also when user tap outside the image.

  struct ContentView: View {
      @StateObject var am = AppManager()
      @State var switchToTakePicture = false
      @State var paths: [PathContainer] = []
      @State var currentDraggingId = UUID()
      @State var spikoPic = #imageLiteral(resourceName: "spiko-16.jpeg")
      @State var centerOFimage = CGSize(width: 0, height: 0)
      var body: some View {
          
          GeometryReader { proxy in
              ZStack {
                  Image(uiImage: spikoPic)
                      .resizable()
                      .scaledToFit()
                      .position(x: proxy.size.width/2, y: proxy.size.height/2)
                      .background(GeometryReader {
                          Color.clear.preference(key: ViewRectKey.self,
                                                 value: [$0.frame(in: .global)])
                      })
                      .gesture(drawGesture) // not correct
                  
                  ForEach(paths) { container in
                      // draw and set the foreground color of the paths to red
                      container.path
                          .stroke(Color.red, lineWidth: 4)
                      
                      
                  }
              }
              .onPreferenceChange(ViewRectKey.self) { rects in
                  print(rects.first ?? .zero)
                  
              }
          }
          
      }
      var drawGesture: some Gesture {
          
          DragGesture(minimumDistance: 0)
              .onChanged { value in
                  
                  // The point that the gesture started from
                  let start = value.startLocation
                  // The point that the gesture ended to
                  let end = value.location
                  // the properties of the rectangle to be drawn
                  let rectangle: CGRect = .init(origin: end,
                                                size: .init(width: start.x - end.x,
                                                            height: start.y - end.y))
                  // create a path for the rectangle
                  let path: Path = .init { path in
                      
                      path.addRect(rectangle)
                  }
                  
                  print("rettangolo = \(rectangle) orig \(rectangle.origin) - height \(rectangle.height) width = \(rectangle.width)")
                  
                  // remove the previous rectangle that was drawen in current
                  // process of drawing
                  paths.removeAll { $0.id == currentDraggingId }
                  // append the new rectangle
                  paths.append(.init(id: currentDraggingId, path: path))
              }
              .onEnded { _ in
                  // renew the dragging id so the app know that the next
                  // drag gesture is drawing a completely new rectangle,
                  // and is not continuing the drawing of the last rectangle
                  currentDraggingId = .init()
              }
      }
  }
  
  
  

  i want no box outside

  
• How to navigate between NavigationLink while leave a part of main window stay the same in SwiftUI

  I would like to navigate between different NavigationLinks in NavigationView while some part of the main window stay the same. For example, I want to make a music app and I want to let the play controller always on top, while I can display different navigation contents (songs page, artists page...) using the rest of the window.

  Like what's showed in the picture below, I want to keep the red part always there while the blue part changes.

  Navigation Example Picture

  My code would be like below, but it won't work correctly. The AlwaysStayView() disappears when I click any NavigationLink on sidebar. So, how can I correct it or is there any solution (prefer in SwiftUI, but framework like UIKit would also be OK). I would appreciate it.

  NavigationView {
              List {
                  NavigationLink { DiscoverView() }
                      label: { Label("Discover", systemImage: "magnifyingglass") }
                  NavigationLink { SongsView() }
                      label: { Label("Songs", systemImage: "music.note") }
                  NavigationLink { ArtistsView() }
                      label: { Label("Artists", systemImage: "music.mic") }
                  }
              }
              .listStyle(SidebarListStyle())
  
              VStack {
                  AlwaysStayView()
                  SongsView()
              }
  }
  
• NumberFormatter and unsigned with UInt64.max

  I'm trying to create a string representing UInt64.max using NumberFormatter. Here's the code:

  let formatter = NumberFormatter()
      
  formatter.usesGroupingSeparator = true
  formatter.numberStyle = .decimal
  formatter.positiveFormat = "# ##0.#########"
  formatter.maximumSignificantDigits = 20
  formatter.usesSignificantDigits = false
  formatter.maximumFractionDigits = 20
  formatter.minimumFractionDigits = 0
  formatter.alwaysShowsDecimalSeparator = false
  // formatter.roundingMode = .halfUp
  let text1 = formatter.string(for: NSNumber(value: Int64.max))
  let text2 = formatter.string(for: NSNumber(value: UInt64.max))
  
  print(text1)
  print(text2)
  

  which prints:

  Optional("9,223,372,036,854,780,000")
  Optional("-1")

  but should print

  Optional("9223372036854775807")
  Optional("18,446,744,073,709,551,615")

  It looks like NSNumber is rounding Int64 and isn't taking the UIn64. The obj-c version of NSNumberFormatter works fine.

  Am I missing something or is there a problem with NumberFormatter?