[ios, macos] Added URL accessor to MGLTileSource

platform/darwin/src/MGLRasterSource.mm

@@ -95,6 +95,11 @@ static const CGFloat MGLRasterSourceRetinaTileSize = 512;
     super.rawSource = rawSource;
 }
 
+- (NSURL *)configurationURL {
+    auto url = self.rawSource->getURL();
+    return url ? [NSURL URLWithString:@(url->c_str())] : nil;
+}
+
 - (NSString *)attributionHTMLString {
     auto attribution = self.rawSource->getAttribution();
     return attribution ? @(attribution->c_str()) : nil;

platform/darwin/src/MGLTileSource.h

@@ -162,6 +162,17 @@ typedef NS_ENUM(NSUInteger, MGLTileCoordinateSystem) {
  */
 - (instancetype)initWithIdentifier:(NSString *)identifier tileURLTemplates:(NS_ARRAY_OF(NSString *) *)tileURLTemplates options:(nullable NS_DICTIONARY_OF(MGLTileSourceOption, id) *)options;
 
+#pragma mark Accessing a Source’s Content
+
+/**
+ The URL to the TileJSON configuration file that specifies the contents of the
+ source.
+
+ If the receiver was initialized using
+ `-initWithIdentifier:tileURLTemplates:options`, this property is set to `nil`.
+ */
+@property (nonatomic, copy, nullable, readonly) NSURL *configurationURL;
+
 #pragma mark Accessing Attribution Strings
 
 /**

platform/darwin/src/MGLTileSource.mm

@@ -27,6 +27,12 @@ const MGLTileSourceOption MGLTileSourceOptionTileCoordinateSystem = @"MGLTileSou
     return [super initWithIdentifier:identifier];
 }
 
+- (NSURL *)configurationURL {
+    [NSException raise:@"MGLAbstractClassException"
+                format:@"MGLTileSource is an abstract class"];
+    return nil;
+}
+
 - (NS_ARRAY_OF(MGLAttributionInfo *) *)attributionInfos {
     return [self attributionInfosWithFontSize:0 linkColor:nil];
 }

platform/darwin/src/MGLVectorSource.mm

@@ -69,6 +69,11 @@
     super.rawSource = rawSource;
 }
 
+- (NSURL *)configurationURL {
+    auto url = self.rawSource->getURL();
+    return url ? [NSURL URLWithString:@(url->c_str())] : nil;
+}
+
 - (NSString *)attributionHTMLString {
     auto attribution = self.rawSource->getAttribution();
     return attribution ? @(attribution->c_str()) : nil;