fix: identify UIAppearance proxy fallbacks safely

Author: DjDeveloperr

NativeScript/ffi/shared/bridge/HostObjects.mm

@@ -566,6 +566,34 @@ bool objectGetPathCanReadRuntimeProperty(id object,
 constexpr const char* kNativeApiAppearanceClassNameExpando =
     "__nativeApiAppearanceClassName";
 
+Class appearanceProxyCustomizableClassFromDescription(id object) {
+#if TARGET_OS_IPHONE
+  if (object == nil) {
+    return Nil;
+  }
+
+  const char* runtimeClassName = object_getClassName(object);
+  if (runtimeClassName == nullptr ||
+      std::strstr(runtimeClassName, "Appearance") == nullptr) {
+    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);
+#else
+  return Nil;
+#endif
+}
+
 Class taggedAppearanceProxyClass(
     Runtime& runtime, const std::shared_ptr<NativeApiBridge>& bridge,
     id object) {
@@ -576,7 +604,7 @@ Class taggedAppearanceProxyClass(
   Value classNameValue = bridge->findObjectExpando(
       runtime, object, kNativeApiAppearanceClassNameExpando);
   if (!classNameValue.isString()) {
-    return Nil;
+    return appearanceProxyCustomizableClassFromDescription(object);
   }
 
   std::string className =