expose camera based lod controls to iOS

platform/ios/src/MLNMapView.h

@@ -426,6 +426,49 @@ MLN_EXPORT
 
 @property (nonatomic, assign) BOOL tileCacheEnabled;
 
+// MARK: Camera based tile level of detail controls
+
+/**
+ Minimum radius around the view point in unit of tiles in which the fine
+ grained zoom level tiles are always used when performing LOD
+ radius must be greater than 1 (At least 1 fine detailed tile is present)
+ A smaller radius value may improve performance at the cost of quality (tiles away from
+ camera use lower Zoom levels)
+ */
+
+@property (nonatomic, assign) double tileLodMinRadius;
+
+/**
+ factor for the distance to the camera view point
+ A value larger than 1 increases the distance to the camera view point reducing LOD
+ Larger values may improve performance at the cost of quality (tiles away from camera
+ use lower Zoom levels)
+ */
+
+@property (nonatomic, assign) double tileLodScale;
+
+/**
+ pitch angle in radians above which LOD calculation is performed
+ A smaller radius value may improve performance at the cost of quality
+ */
+
+@property (nonatomic, assign) double tileLodPitchThreshold;
+
+/**
+ Shift applied to the Zoom level during LOD calculation
+ A negative value shifts the Zoom level to a coarser level reducing quality but
+ improving performance
+ A positive value shifts the Zoom level to a finer level increasing details but
+ negatively affecting performance
+ A value of zero (default) does not apply any shift to the Zoom level
+ It is not recommended to change the default value unless performance is critical
+ and the loss of quality is acceptable. A value of -1 reduces the number of
+ displayed tiles by a factor of 4 on average
+ It is recommended to first configure the pixelRatio before adjusting
+ TileLodZoomShift. {@link MapLibreMapOptions#pixelRatio(float)}
+ */
+@property (nonatomic, assign) double tileLodZoomShift;
+
 // MARK: Displaying the User’s Location
 
 /**

platform/ios/src/MLNMapView.mm

@@ -3159,6 +3159,46 @@ - (BOOL)tileCacheEnabled
     return _rendererFrontend->getTileCacheEnabled();
 }
 
+- (void)setTileLodMinRadius:(double)radius
+{
+    self.mbglMap.setTileLodMinRadius(radius);
+}
+
+- (double)tileLodMinRadius
+{
+    return self.mbglMap.getTileLodMinRadius();
+}
+
+- (void)setTileLodScale:(double)scale
+{
+    self.mbglMap.setTileLodScale(scale);
+}
+
+- (double)tileLodScale
+{
+    return self.mbglMap.getTileLodScale();
+}
+
+- (void)setTileLodPitchThreshold:(double)threshold
+{
+    self.mbglMap.setTileLodPitchThreshold(threshold);
+}
+
+- (double)tileLodPitchThreshold
+{
+    return self.mbglMap.getTileLodPitchThreshold();
+}
+
+- (void)setTileLodZoomShift:(double)shift
+{
+    self.mbglMap.setTileLodZoomShift(shift);
+}
+
+- (double)tileLodZoomShift
+{
+    return self.mbglMap.getTileLodZoomShift();
+}
+
 // MARK: - Accessibility -
 
 - (NSString *)accessibilityValue