2 files changed, 38 insertions, 0 deletions
diff --git a/platform/darwin/src/NSURL+MGLAdditions.h b/platform/darwin/src/NSURL+MGLAdditions.h
new file mode 100644
index 0000000000..70fd79f064
--- /dev/null
+++ b/platform/darwin/src/NSURL+MGLAdditions.h
@@ -0,0 +1,17 @@
+#import <Foundation/Foundation.h>
+
+#import "MGLTypes.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface NSURL (MGLAdditions)
+
+/**
+ Returns the given URL, modified if necessary to use the asset: URL scheme
+ expected by mbgl for local requests.
+ */
+- (nullable NSURL *)mgl_URLByStandardizingScheme;
+
+@end
+
+NS_ASSUME_NONNULL_END
diff --git a/platform/darwin/src/NSURL+MGLAdditions.m b/platform/darwin/src/NSURL+MGLAdditions.m
new file mode 100644
index 0000000000..11b84ed8fa
--- /dev/null
+++ b/platform/darwin/src/NSURL+MGLAdditions.m
@@ -0,0 +1,21 @@
+#import "NSURL+MGLAdditions.h"
+
+@implementation NSURL (MGLAdditions)
+
+- (nullable NSURL *)mgl_URLByStandardizingScheme {
+    if (!self.scheme) {
+        // Relative file URL, already escaped (in order to create the NSURL).
+        // Assume a relative path into the application’s resource folder.
+        return [NSURL URLWithString:[@"asset://" stringByAppendingString:self.absoluteString]];
+    } else if (self.fileURL) {
+        // Absolute file URL, so construct a new URL using the unescaped path.
+        NSURLComponents *components = [[NSURLComponents alloc] init];
+        components.scheme = @"asset";
+        components.host = @"";
+        components.path = self.path;
+        return components.URL;
+    }
+    return self;
+}
+
+@end