ios – 如何在Objective-C类别中使用内部方法？

编辑

我不想修改原始代码,所以我不想在原始类头文件中声明内部方法.

代码

在原始的类实现文件(.m)中,我有这个方法实现：

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

在类别中,我想添加此方法：

- (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];
}

在我调用storeKitItemscompiler的每一行中都说：未找到类方法“storeKitItems”…