[ios] Add debug descriptions to shapes and features

platform/darwin/src/MGLFeature.mm

@@ -42,6 +42,15 @@ MGL_DEFINE_FEATURE_IS_EQUAL();
     return mbglFeature({[self geometryObject]}, identifier, self.attributes);
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; identifier = %@, coordinate = %f, %f, attributes = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.identifier ? [NSString stringWithFormat:@"\"%@\"", self.identifier] : self.identifier,
+            self.coordinate.latitude, self.coordinate.longitude,
+            self.attributes.count ? self.attributes : @"none"];
+}
+
 @end
 
 @interface MGLPolylineFeature ()
@@ -68,6 +77,16 @@ MGL_DEFINE_FEATURE_IS_EQUAL();
     return mbglFeature({[self geometryObject]}, identifier, self.attributes);
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; identifier = %@, count = %lu, bounds = %@, attributes = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.identifier ? [NSString stringWithFormat:@"\"%@\"", self.identifier] : self.identifier,
+            (unsigned long)[self pointCount],
+            MGLStringFromCoordinateBounds(self.overlayBounds),
+            self.attributes.count ? self.attributes : @"none"];
+}
+
 @end
 
 @interface MGLPolygonFeature ()
@@ -94,6 +113,16 @@ MGL_DEFINE_FEATURE_IS_EQUAL();
     return mbglFeature({[self geometryObject]}, identifier, self.attributes);
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; identifier = %@, count = %lu, bounds = %@, attributes = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.identifier ? [NSString stringWithFormat:@"\"%@\"", self.identifier] : self.identifier,
+            (unsigned long)[self pointCount],
+            MGLStringFromCoordinateBounds(self.overlayBounds),
+            self.attributes.count ? self.attributes : @"none"];
+}
+
 @end
 
 @interface MGLPointCollectionFeature ()
@@ -146,6 +175,16 @@ MGL_DEFINE_FEATURE_IS_EQUAL();
     return mbglFeature({[self geometryObject]}, identifier, self.attributes);
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; identifier = %@, count = %lu, bounds = %@, attributes = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.identifier ? [NSString stringWithFormat:@"\"%@\"", self.identifier] : self.identifier,
+            (unsigned long)self.polylines.count,
+            MGLStringFromCoordinateBounds(self.overlayBounds),
+            self.attributes.count ? self.attributes : @"none"];
+}
+
 @end
 
 @interface MGLMultiPolygonFeature ()
@@ -172,6 +211,16 @@ MGL_DEFINE_FEATURE_IS_EQUAL();
     return mbglFeature({[self geometryObject]}, identifier, self.attributes);
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; identifier = %@, count = %lu, bounds = %@, attributes = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.identifier ? [NSString stringWithFormat:@"\"%@\"", self.identifier] : self.identifier,
+            (unsigned long)self.polygons.count,
+            MGLStringFromCoordinateBounds(self.overlayBounds),
+            self.attributes.count ? self.attributes : @"none"];
+}
+
 @end
 
 @interface MGLShapeCollectionFeature ()

platform/darwin/src/MGLPolygon.mm

@@ -200,4 +200,14 @@
              @"coordinates": coordinates};
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; title = %@, subtitle: = %@, count = %lu; bounds = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.title ? [NSString stringWithFormat:@"\"%@\"", self.title] : self.title,
+            self.subtitle ? [NSString stringWithFormat:@"\"%@\"", self.subtitle] : self.subtitle,
+            (unsigned long)self.polygons.count,
+            MGLStringFromCoordinateBounds(self.overlayBounds)];
+}
+
 @end

platform/darwin/src/MGLPolyline.mm

@@ -201,4 +201,14 @@
              @"coordinates": coordinates};
 }
 
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<%@: %p; title = %@, subtitle: = %@, count = %lu; bounds = %@>",
+            NSStringFromClass([self class]), (void *)self,
+            self.title ? [NSString stringWithFormat:@"\"%@\"", self.title] : self.title,
+            self.subtitle ? [NSString stringWithFormat:@"\"%@\"", self.subtitle] : self.subtitle,
+            (unsigned long)self.polylines.count,
+            MGLStringFromCoordinateBounds(self.overlayBounds)];
+}
+
 @end