infinitered · jamonholmgren · Mar 25, 2015 · Mar 19, 2015 · Mar 24, 2015
diff --git a/README.md b/README.md
@@ -310,6 +310,28 @@ end
 
 ---
 
+### Delegate callbacks
+
+These methods (if implemented in your `MapScreen`) will be called when the corresponding `MKMapViewDelegate` method is invoked:
+
+```ruby
+def will_change_region(animated)
+  # Do something when the region will change
+  # The animated parameter is optional so you can also define it is simply:
+  # def will_change_region
+  # end
+end
+
+def on_change_region(animated)
+  # Do something when the region changed
+  # The animated parameter is optional so you can also define it is simply:
+  # def on_change_region
+  # end
+end
+```
+
+---
+
 ### CocoaTouch Property Convenience Methods
 
 `MKMapView` contains multiple property setters and getters that can be accessed in a more ruby-like syntax:

diff --git a/app/test_screens/test_map_screen.rb b/app/test_screens/test_map_screen.rb
@@ -1,12 +1,15 @@
 class TestMapScreen < PM::MapScreen
   attr_accessor :infinite_loop_points, :request_complete, :action_called
+  attr_accessor :got_will_change_region, :got_on_change_region
 
   start_position latitude: 35.090648651123, longitude: -82.965972900391, radius: 4
   title "Gorges State Park, NC"
   tap_to_add length: 1.5, annotation: {animates_drop: false, title: "A new park?"}
 
   def on_load
     @action_called = false
+    @got_will_change_region = false
+    @got_on_change_region = false
   end
 
   def promotion_annotation_data
@@ -54,4 +57,12 @@ def my_action
     @action_called = true
   end
 
+  def will_change_region
+    @got_will_change_region = true
+  end
+
+  def on_change_region
+    @got_on_change_region = true
+  end
+
 end
diff --git a/lib/ProMotion/map/map_screen_module.rb b/lib/ProMotion/map/map_screen_module.rb
@@ -312,6 +312,22 @@ def mapView(map_view, didUpdateUserLocation:userLocation)
       end
     end
 
+    def mapView(map_view, regionWillChangeAnimated:animated)
+      if self.respond_to?("will_change_region:")
+        will_change_region(animated)
+      elsif self.respond_to?(:will_change_region)
+        will_change_region
+      end
+    end
+
+    def mapView(map_view, regionDidChangeAnimated:animated)
+      if self.respond_to?("on_change_region:")
+        on_change_region(animated)
+      elsif self.respond_to?(:on_change_region)
+        on_change_region
+      end
+    end
+
     ########## Cocoa touch Ruby counterparts #################
 
     def type

diff --git a/spec/func_map_screen_spec.rb b/spec/func_map_screen_spec.rb
@@ -274,4 +274,18 @@ def add_image_annotation
       @placemark = nil
     end
   end
+
+  it "should call will_change_region" do
+    map_screen.on_load
+    map_screen.got_will_change_region.should == false
+    map_screen.mapView(map_screen.map, regionWillChangeAnimated: true)
+    map_screen.got_will_change_region.should == true
+  end
+
+  it "should call on_change_region" do
+    map_screen.on_load
+    map_screen.got_on_change_region.should == false
+    map_screen.mapView(map_screen.map, regionDidChangeAnimated: true)
+    map_screen.got_on_change_region.should == true
+  end
 end