fix: persist UIAppearance proxy setter values

Author: DjDeveloperr

NativeScript/ffi/shared/bridge/HostObjects.mm

@@ -563,6 +563,29 @@ bool objectGetPathCanReadRuntimeProperty(id object,
   return false;
 }
 
+Class appearanceProxyCustomizableClass(id object) {
+  if (object == nil) {
+    return Nil;
+  }
+
+  NSString* description = [object description];
+  NSString* prefix = @"<Customizable class: ";
+  if (description.length <= prefix.length + 1 ||
+      ![description hasPrefix:prefix] || ![description hasSuffix:@">"]) {
+    return Nil;
+  }
+
+  NSRange classNameRange =
+      NSMakeRange(prefix.length, description.length - prefix.length - 1);
+  NSString* className = [description substringWithRange:classNameRange];
+  return NSClassFromString(className);
+}
+
+std::string appearanceProxyExpandoPropertyKey(
+    const std::string& property) {
+  return "__nativeApiAppearance:" + property;
+}
+
 class NativeApiSuperHostObject final : public HostObject {
  public:
   NativeApiSuperHostObject(std::shared_ptr<NativeApiBridge> bridge,
@@ -1246,6 +1269,13 @@ Value get(Runtime& runtime, const PropNameID& name) override {
     if (!expando.isUndefined()) {
       return expando;
     }
+    if (Class appearanceClass = appearanceProxyCustomizableClass(object_)) {
+      Value appearanceExpando = bridge_->findObjectExpando(
+          runtime, appearanceClass, appearanceProxyExpandoPropertyKey(property));
+      if (!appearanceExpando.isUndefined()) {
+        return appearanceExpando;
+      }
+    }
 
     // Fast path: cached metadata property-getter resolution. Skips the
     // special-name chain + per-access metadata discovery for hot getters
@@ -1725,6 +1755,11 @@ throw JSError(
       Value args[] = {Value(runtime, value)};
       callObjCSelector(runtime, bridge_, object_, false,
                        *setterSelectorName, nullptr, args, 1);
+      if (Class appearanceClass = appearanceProxyCustomizableClass(object_)) {
+        bridge_->setObjectExpando(
+            runtime, appearanceClass,
+            appearanceProxyExpandoPropertyKey(property), value);
+      }
       if (!objectGetPathCanReadRuntimeProperty(object_, property)) {
         bridge_->setObjectExpando(runtime, object_, property, value);
       }