import MapKit

func openDirections() {
  let dest = MKMapItem(
    placemark: MKPlacemark(
      coordinate: .init(latitude: 37.3349, longitude: -122.0090)
    )
  )
  dest.name = "Apple Park"
  dest.openInMaps(
    launchOptions: [
      MKLaunchOptionsDirectionsModeKey: MKLaunchOptionsDirectionsModeDriving
    ]
  )
}

                    

import SwiftUI

struct ContentView: View {
  var body: some View {
    Button("Open Directions") { openDirections() }
      .padding()
  }
}

                    

import SwiftUI

@main
struct MyApp: App {
  var body: some Scene {
    WindowGroup { ContentView() }
  }
}