How to use an internal method in a Objective-C category?

Question

Trying to extend the capabilities from a open source project, I wrote a category for add a new method. In this new method, the category needs to access to an internal method from the original class, but the compiler says that it can't find the method (of course, is internal). Is there any way to expose this method for the category?

EDIT

I don't want to modify the original code, so I don't want to declare the internal method in the original class header file.

The code

In the original class implementation file (.m), I have this method implementation:

+(NSDictionary*) storeKitItems
{
  return [NSDictionary dictionaryWithContentsOfFile:
          [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:
           @"MKStoreKitConfigs.plist"]];
} 

In the category, I want to add this method:

- (void)requestProductData:(NSArray *(^)())loadIdentifierBlock
{
    NSMutableArray *productsArray = [NSMutableArray array];
    NSArray *consumables = [[[MKStoreManager storeKitItems] objectForKey:@"Consumables"] allKeys];
    NSArray *nonConsumables = [[MKStoreManager storeKitItems] objectForKey:@"Non-Consumables"];
    NSArray *subscriptions = [[[MKStoreManager storeKitItems] objectForKey:@"Subscriptions"] allKeys];
    if(loadIdentifierBlock != nil) [productsArray addObjectsFromArray:loadIdentifierBlock()];
    [productsArray addObjectsFromArray:consumables];
    [productsArray addObjectsFromArray:nonConsumables];
    [productsArray addObjectsFromArray:subscriptions];
    self.productsRequest.delegate = self;
    [self.productsRequest start];
}

In every line in which I call storeKitItemscompiler says: Class method "+storeKitItems" not found ...

Answer 1

A category has no access to the private methods of a class. It's no different than trying to call those methods from any other class. At least if you call the private method directly. Since Objective-C is so dynamic, you can call private methods (which is a bad idea) using other means such as using performSelector or with NSInvocation.

Again, this is a bad idea. An update to the implementation of the class could break your category.

Edit: Now that there is code posted -

Since the +storeKitItems method is not declared in the .h file, no category or other class can access the private method.