[ios] getters, setters for minZoom, maxZoom

adds:
minimumZoomLevel
setMinimumZoomLevel
maximumZoomLevel
setMaximumZoomLevel

3 files changed, 46 insertions, 0 deletions

diff --git a/CHANGELOG.md b/CHANGELOG.md
index 45eedeb6f5..822028f4c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -75,6 +75,8 @@ Known issues:
 - Fixed crash caused by MGLAnnotationImage with non-integer width or height ([#2198](https://github.com/mapbox/mapbox-gl-native/issues/2198))
 - Fixed “include of non-modular header” errors in Swift projects managed by CocoaPods. ([#3679](https://github.com/mapbox/mapbox-gl-native/pull/3679)) 
 - Avoids triggering the blue background location status bar when user has granted "when in use" permission. ([#3671](https://github.com/mapbox/mapbox-gl-native/issues/3671))
+- Added new methods to MGLMapView for getting and setting the minimum and maximum zoom levels: `minimumZoomLevel`, `setMinimumZoomLevel`, `maximumZoomLevel`, `setMaximumZoomLevel`. ([#509](https://github.com/mapbox/mapbox-gl-native/issues/509))
+- The default `maximumZoomLevel` changed from 18 to 20.
 
 ## iOS 3.0.1
 
diff --git a/include/mbgl/ios/MGLMapView.h b/include/mbgl/ios/MGLMapView.h
index b27db4976a..bd4b048d64 100644
--- a/include/mbgl/ios/MGLMapView.h
+++ b/include/mbgl/ios/MGLMapView.h
@@ -464,6 +464,30 @@ IB_DESIGNABLE
 - (void)setZoomLevel:(double)zoomLevel animated:(BOOL)animated;
 
 /**
+ * The minimum zoom level at which the map can be shown.
+ *
+ * Depending on the map view’s aspect ratio, the map view may be prevented
+ * from reaching the minimum zoom level, in order to keep the map from
+ * repeating within the current viewport.
+ *
+ * If the value of this property is greater than that of the
+ * maximumZoomLevel property, the behavior is undefined.
+ *
+ * The default minimumZoomLevel is 0.
+ */
+@property (nonatomic) double minimumZoomLevel;
+
+/**
+ * The maximum zoom level the map can be shown at.
+ *
+ * If the value of this property is smaller than that of the
+ * minimumZoomLevel property, the behavior is undefined.
+ *
+ * The default maximumZoomLevel is 20.
+ */
+@property (nonatomic) double maximumZoomLevel;
+
+/**
  The heading of the map, measured in degrees clockwise from true north.
  
  The value `0` means that the top edge of the map view corresponds to true
diff --git a/platform/ios/src/MGLMapView.mm b/platform/ios/src/MGLMapView.mm
index e301686419..954fc8a935 100644
--- a/platform/ios/src/MGLMapView.mm
+++ b/platform/ios/src/MGLMapView.mm
@@ -1784,6 +1784,26 @@ mbgl::Duration MGLDurationInSeconds(NSTimeInterval duration)
                       MGLDurationInSeconds(duration));
 }
 
+- (void)setMinimumZoomLevel:(double)minimumZoomLevel
+{
+    _mbglMap->setMinZoom(minimumZoomLevel);
+}
+
+- (double)minimumZoomLevel
+{
+    return _mbglMap->getMinZoom();
+}
+
+- (void)setMaximumZoomLevel:(double)maximumZoomLevel
+{
+    _mbglMap->setMaxZoom(maximumZoomLevel);
+}
+
+- (double)maximumZoomLevel
+{
+    return _mbglMap->getMaxZoom();
+}
+
 - (MGLCoordinateBounds)visibleCoordinateBounds
 {
     return [self convertRect:self.bounds toCoordinateBoundsFromView:self];