Adds symbol capability for UIView contentModes

Closes #216

motion/ruby_motion_query/stylers/ui_view_styler.rb

@@ -92,6 +92,22 @@ module RubyMotionQuery
       all: UITextAutocapitalizationTypeAllCharacters
     }
 
+    CONTENT_MODE_TYPES = {
+      scale_to_fill: UIViewContentModeScaleToFill,
+      scale_aspect_fit: UIViewContentModeScaleAspectFit,
+      scale_aspect_fill: UIViewContentModeScaleAspectFill,
+      redraw: UIViewContentModeRedraw,
+      center: UIViewContentModeCenter,
+      top: UIViewContentModeTop,
+      bottom: UIViewContentModeBottom,
+      left: UIViewContentModeLeft,
+      right: UIViewContentModeRight,
+      top_left: UIViewContentModeTopLeft,
+      top_right: UIViewContentModeTopRight,
+      bottom_left: UIViewContentModeBottomLeft,
+      bottom_right: UIViewContentModeBottomRight
+    }
+
     # When you create a styler, always inherit UIViewStyler
     class UIViewStyler
       def initialize(view)
@@ -272,7 +288,7 @@ module RubyMotionQuery
       end
 
       def content_mode=(value)
-        @view.setContentMode value
+        @view.setContentMode(CONTENT_MODE_TYPES[value] || value)
       end
       def content_mode
         @view.contentMode

spec/stylers/_ui_view_styler.rb

@@ -57,6 +57,11 @@ class StyleSheetForUIViewStylerTests < RubyMotionQuery::Stylesheet
     st.shadow_opacity = 0.5
     st.shadow_path = UIBezierPath.bezierPathWithRect(st.view.bounds).CGPath
   end
+
+  def ui_view_content_mode_symbol(st)
+    ui_view_kitchen_sink(st)
+    st.content_mode = :center
+  end
 end
 
 shared 'styler' do
@@ -340,6 +345,11 @@ describe 'ui_view_styler' do
     view.layer.shadowPath.should == UIBezierPath.bezierPathWithRect(view.bounds).CGPath
   end
 
+  it "should use symbols for content_mode" do
+    view = @vc.rmq.append(@view_klass, :ui_view_content_mode_symbol).get
+    view.contentMode.should == UIViewContentModeCenter
+  end
+
   describe "background_gradient" do
     before do
       @view = UIView.alloc.init