Hi there!
I am tying to add and select a map pin using view long press when the gesture is begin.
However after adding and selecting the pin it got deselected immediately, my assumption that it's conflicting when the original map gesture and it's deselecting the pin on the map (like if a pin was selected and you click anywhere on the map to deselect it).
Note that if I increase minimumPressDuration for the UILongPressGestureRecognizer it works fine, but I want the value at 0.5 so the pin is quickly added.
here is the full code:
import SwiftUI
import MapKit
struct ContentView: View {
@State var selection: CustomMapSelection?
@State private var longPressPosition: CGPoint = .zero
@State private var pinCoordinate: CLLocationCoordinate2D?
var body: some View {
MapReader { proxy in
Map(selection: $selection) {
if let pinCoordinate {
Marker("Custom Location", coordinate: pinCoordinate)
.tag(CustomMapSelection(coordinate: pinCoordinate))
}
}
.gesture(LongPressGestureRecognizer(position: $longPressPosition))
.onChange(of: longPressPosition) {
if let coordinate = proxy.convert(longPressPosition, from: .global) {
pinCoordinate = coordinate
selection = CustomMapSelection(coordinate: coordinate)
}
}
}
}
}
struct CustomMapSelection: Hashable {
let latitude: Double
let longitude: Double
init(coordinate: CLLocationCoordinate2D) {
latitude = coordinate.latitude
longitude = coordinate.longitude
}
}
struct LongPressGestureRecognizer: UIGestureRecognizerRepresentable {
@Binding var position: CGPoint
func makeCoordinator(converter: CoordinateSpaceConverter) -> Coordinator {
Coordinator()
}
func makeUIGestureRecognizer(context: Context) -> UILongPressGestureRecognizer {
let recognizer = UILongPressGestureRecognizer()
recognizer.delegate = context.coordinator
// if you make the minimumPressDuration above 2, it works fine and the selection doesn't cancel
recognizer.minimumPressDuration = 0.5
return recognizer
}
func handleUIGestureRecognizerAction(_ recognizer: UILongPressGestureRecognizer, context: Context) {
if recognizer.state == .began {
let position = recognizer.location(in: recognizer.view)
self.position = position
}
}
class Coordinator: NSObject, UIGestureRecognizerDelegate {
func gestureRecognizer(
_ gestureRecognizer: UIGestureRecognizer,
shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer
) -> Bool {
return true
}
}
}
#Preview {
ContentView()
}
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