Thank you very much!
When converted like that, the geographic coordinates look perfect. So the overall question still remains: Why are none of the MKPolyline(s) visible on the map?
For more information on this project, see https://developer.apple.com/forums/thread/680107
This is the main swift file in the KMLviewer project:
swift
//
// KMLViewerViewController.swift
// KMLViewer
//
// Translated by OOPer in cooperation with shlab.jp, on 2015/10/17.
//
//
/*
Copyright (C) 2015 Apple Inc. All Rights Reserved.
See LICENSE.txt for this sample’s licensing information
Abstract:
Displays an MKMapView and demonstrates how to use the included KMLParser class to place annotations and overlays from a parsed KML file on top of the MKMapView./
import UIKit
import MapKit
@objc(KMLViewerViewController)
class KMLViewerViewController: UIViewController, MKMapViewDelegate {
@IBOutlet private weak var map: MKMapView!
private var kmlParser: KMLParser!
override func viewDidLoad() {
super.viewDidLoad()
map.mapType = .hybridFlyover
// Locate the path to the file in the application's bundle
// and parse it with the KMLParser.
let url = Bundle.main.url(forResource: "KML_Sample", withExtension: "kml")!
self.kmlParser = KMLParser(url: url)
self.kmlParser.parseKML()
// Add all of the MKOverlay objects parsed from the KML file to the map.
let overlays = self.kmlParser.overlays
overlays.forEach {overlay in
if let polyline = overlay as? MKPolyline {
var coords = Array(repeating: CLLocationCoordinate2D(), count: polyline.pointCount)
polyline.getCoordinates(&coords, range: NSRange(0..polyline.pointCount))
print(coords)
}
}
self.map.addOverlays(overlays)
let temp_debug = overlays.map {$0 as! MKPolyline}.map {Array(UnsafeBufferPointer(start:$0.points(),count:$0.pointCount))}
// Add all of the MKAnnotation objects parsed from the KML file to the map.
let annotations = self.kmlParser.points
self.map.addAnnotations(annotations)
// Walk the list of overlays and annotations and create a MKMapRect that
// bounds all of them and store it into flyTo.
var flyTo = MKMapRect.null
for overlay in overlays {
if flyTo.isNull {
flyTo = overlay.boundingMapRect
} else {
flyTo = flyTo.union(overlay.boundingMapRect)
}
}
for annotation in annotations {
let annotationPoint = MKMapPoint(annotation.coordinate)
let pointRect = MKMapRect(x: annotationPoint.x, y: annotationPoint.y, width: 0, height: 0)
if flyTo.isNull {
flyTo = pointRect
} else {
flyTo = flyTo.union(pointRect)
}
}
// Position the map so that all overlays and annotations are visible on screen.
self.map.visibleMapRect = flyTo
}
//MARK: MKMapViewDelegate
func mapView(_ mapView: MKMapView, rendererFor overlay: MKOverlay) - MKOverlayRenderer {
return self.kmlParser.rendererForOverlay(overlay)!
}
func mapView(_ mapView: MKMapView, viewFor annotation: MKAnnotation) - MKAnnotationView? {
return self.kmlParser.viewForAnnotation(annotation)
}
}
