AppNavigator.openMap() now works on iOS

Also implemented currently unused AppNavigator.openWalkingDirections()

shared/src/iosMain/kotlin/app/klottr/platform/AppNavigator.ios.kt

@@ -1,7 +1,49 @@
+@file:OptIn(ExperimentalForeignApi::class)
+
 package app.klottr.platform
 
-import platform.Foundation.NSURL    
+import kotlinx.cinterop.ExperimentalForeignApi
+import kotlinx.cinterop.useContents
+import platform.Foundation.NSURL
 import platform.UIKit.UIApplication
+import platform.Foundation.NSURLComponents
+import platform.Foundation.NSURLQueryItem
+import platform.darwin.dispatch_async
+import platform.darwin.dispatch_get_main_queue
+import platform.Foundation.*
+
+private fun urlEncode(query: String): String {
+    // Percent-encode for use in URL query
+    val encoded = (query as NSString)
+        .stringByAddingPercentEncodingWithAllowedCharacters(
+            NSCharacterSet.URLQueryAllowedCharacterSet()
+        )
+    return encoded ?: query
+}
+
+
+private fun isAtLeast(major: Int, minor: Int = 0, patch: Int = 0): Boolean {
+    val current = NSProcessInfo.processInfo.operatingSystemVersion
+    return current.useContents {
+        when {
+            this.majorVersion > major -> true
+            this.majorVersion < major -> false
+            this.minorVersion > minor -> true
+            this.minorVersion < minor -> false
+            else -> this.patchVersion >= patch
+        }
+    }
+}
+
+private fun openUrlOnMain(url: NSURL) {
+    dispatch_async(dispatch_get_main_queue()) {
+        UIApplication.sharedApplication.openURL(
+            url,
+            options = emptyMap<Any?, Any?>(),
+            completionHandler = null
+        )
+    }
+}
 
 actual object AppNavigator {
     actual fun openUrl(url: String) {
@@ -10,13 +52,35 @@ actual object AppNavigator {
     }
     actual fun openMap(lat: Double, lon: Double, label: String?) {
         // Use Apple Maps URL scheme
-        val encoded = label?.let { it } ?: "Place"
-        val url = "http://maps.apple.com/?ll=$lat,$lon&q=$encoded"
-        openUrl(url)
+        // This always opens apple maps, regardless of what navigation app you've set in system settings.
+        // There seems to be no way around that without implementing your own chooser.
+        val comps = NSURLComponents(string = "maps://")
+        comps.path = "/"
+        comps.queryItems = listOf(
+            NSURLQueryItem(name = "ll", value = "$lat,$lon"),
+            NSURLQueryItem(name = "q", value = label ?: "Place")
+        )
+        val nsUrl = comps.URL ?: return
+        openUrlOnMain(nsUrl)
     }
 
     actual fun openWalkingDirections(lat: Double?, lon: Double?, title: String?) {
-        //TODO: Implement
+        // On iOS 18.4+ there is a "default navigation app" setting in EU countries.
+        // This implementation makes sure to use it if available
+
+        // Build a destination string. You can replace this with a full address if you have one.
+        val destination = "$lat,$lon"
+        val encoded = urlEncode(destination)
+
+        val urlString = if (isAtLeast(18, 4, 0)) {
+            // iOS routes this to the user's chosen default navigation app
+            "geo-navigation:///directions?destination=$encoded"
+        } else {
+            // Apple Maps fallback: driving directions to destination
+            "maps://?daddr=$encoded&dirflg=d"
+        }
+
+        openUrlOnMain((NSURL(string = urlString)))
     }
 
 }