feat(ios): backgroundColor for RefreshControl (#14016)

* feat(ios): backgroundColor for RefreshControl

* fix version number

Author: m1ga

apidoc/Titanium/UI/RefreshControl.yml

@@ -55,6 +55,14 @@ properties:
     platforms: [android, iphone, ipad, macos]
     since: { android: "6.2.0", iphone: "3.2.0", ipad: "3.2.0" }
 
+  - name: backgroundColor
+    summary: The background color for the refresh control, as a color name or hex triplet.
+    description: |
+        For information about color values, see the "Colors" section of <Titanium.UI>.
+    type: [String, Titanium.UI.Color]
+    platforms: [iphone, ipad, macos]
+    since: { iphone: "12.4.0", ipad: "12.4.0", macos: "12.4.0" }
+
 events:
   - name: refreshstart
     summary: |

iphone/Classes/TiUIRefreshControlProxy.m

@@ -78,6 +78,17 @@ - (void)setTintColor:(id)value
       NO);
 }
 
+- (void)setBackgroundColor:(id)value
+{
+  [self replaceValue:value forKey:@"backgroundColor" notification:NO];
+
+  TiThreadPerformOnMainThread(
+      ^{
+        [[self control] setBackgroundColor:[[TiUtils colorValue:value] color]];
+      },
+      NO);
+}
+
 - (void)beginRefreshing:(id)unused
 {
   TiThreadPerformOnMainThread(