Properly fail to load the map

A typo in a selector literal meant that `-[MGLMapViewDelegate mapViewDidFailLoadingMap:withError:]` would never be sent to delegates even if `MGLMapView` had called it. Along for the ride, create a proper `NSError` to pass into that callback, and an error domain for that error.

2 files changed, 6 insertions, 2 deletions

diff --git a/platform/ios/MGLMapView.mm b/platform/ios/MGLMapView.mm
index ff31ec9e1a..dfbb034398 100644
--- a/platform/ios/MGLMapView.mm
+++ b/platform/ios/MGLMapView.mm
@@ -2352,9 +2352,10 @@ CLLocationCoordinate2D latLngToCoordinate(mbgl::LatLng latLng)
         }
         case mbgl::MapChangeDidFailLoadingMap:
         {
-            if ([self.delegate respondsToSelector:@selector(mapViewDidFailLoadingMap:withError::)])
+            if ([self.delegate respondsToSelector:@selector(mapViewDidFailLoadingMap:withError:)])
             {
-                [self.delegate mapViewDidFailLoadingMap:self withError:nil];
+                NSError *error = [NSError errorWithDomain:MGLErrorDomain code:0 userInfo:nil];
+                [self.delegate mapViewDidFailLoadingMap:self withError:error];
             }
             break;
         }
diff --git a/platform/ios/MGLTypes.m b/platform/ios/MGLTypes.m
new file mode 100644
index 0000000000..01e9a1467c
--- /dev/null
+++ b/platform/ios/MGLTypes.m
@@ -0,0 +1,3 @@
+#import "MGLTypes.h"
+
+NSString * const MGLErrorDomain = @"MGLErrorDomain";