为什么自动创建NSManagedObject子类没有“适当”头？

Question

如果我创建NSManagedObject子类的子类，我会在实现文件Business.m（例如）

上看到这些函数。在头文件Business.h中没有声明这些函数。我必须亲自添加

- (void)addDistrictsObject:(District *)value; 
- (void)addCategoriesObject:(Category *)value; 
- (void)addReviewsObject:(Review *)value; 

我想知道为什么我必须手动添加这些声明？为什么不自动当我试图生成子类？

下面是顺便功能：

- (void)addPromotionsObject:(Promotion *)value {  
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Promotions"] addObject:value]; 
    [self didChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)removePromotionsObject:(Promotion *)value { 
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Promotions"] removeObject:value]; 
    [self didChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)addPromotions:(NSSet *)value {  
    [self willChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Promotions"] unionSet:value]; 
    [self didChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
} 

- (void)removePromotions:(NSSet *)value { 
    [self willChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Promotions"] minusSet:value]; 
    [self didChangeValueForKey:@"Promotions" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
} 



- (void)addCategoriesObject:(Category *)value {  
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Categories" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Categories"] addObject:value]; 
    [self didChangeValueForKey:@"Categories" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)removeCategoriesObject:(Category *)value { 
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Categories" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Categories"] removeObject:value]; 
    [self didChangeValueForKey:@"Categories" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)addCategories:(NSSet *)value {  
    [self willChangeValueForKey:@"Categories" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Categories"] unionSet:value]; 
    [self didChangeValueForKey:@"Categories" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
} 

- (void)removeCategories:(NSSet *)value { 
    [self willChangeValueForKey:@"Categories" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Categories"] minusSet:value]; 
    [self didChangeValueForKey:@"Categories" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
} 



- (void)addImagesObject:(Image *)value {  
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Images" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Images"] addObject:value]; 
    [self didChangeValueForKey:@"Images" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)removeImagesObject:(Image *)value { 
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Images" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Images"] removeObject:value]; 
    [self didChangeValueForKey:@"Images" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)addImages:(NSSet *)value {  
    [self willChangeValueForKey:@"Images" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Images"] unionSet:value]; 
    [self didChangeValueForKey:@"Images" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
} 

- (void)removeImages:(NSSet *)value { 
    [self willChangeValueForKey:@"Images" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Images"] minusSet:value]; 
    [self didChangeValueForKey:@"Images" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
} 



- (void)addReviewsObject:(Review *)value {  
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Reviews"] addObject:value]; 
    [self didChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)removeReviewsObject:(Review *)value { 
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Reviews"] removeObject:value]; 
    [self didChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)addReviews:(NSSet *)value {  
    [self willChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Reviews"] unionSet:value]; 
    [self didChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
} 

- (void)removeReviews:(NSSet *)value { 
    [self willChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Reviews"] minusSet:value]; 
    [self didChangeValueForKey:@"Reviews" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
} 


- (void)addURLsObject:(URL *)value {  
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"URLs" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"URLs"] addObject:value]; 
    [self didChangeValueForKey:@"URLs" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)removeURLsObject:(URL *)value { 
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"URLs" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"URLs"] removeObject:value]; 
    [self didChangeValueForKey:@"URLs" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)addURLs:(NSSet *)value {  
    [self willChangeValueForKey:@"URLs" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"URLs"] unionSet:value]; 
    [self didChangeValueForKey:@"URLs" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
} 

- (void)removeURLs:(NSSet *)value { 
    [self willChangeValueForKey:@"URLs" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"URLs"] minusSet:value]; 
    [self didChangeValueForKey:@"URLs" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
} 



- (void)addDistrictsObject:(District *)value {  
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Districts" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Districts"] addObject:value]; 
    [self didChangeValueForKey:@"Districts" withSetMutation:NSKeyValueUnionSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)removeDistrictsObject:(District *)value { 
    NSSet *changedObjects = [[NSSet alloc] initWithObjects:&value count:1]; 
    [self willChangeValueForKey:@"Districts" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [[self primitiveValueForKey:@"Districts"] removeObject:value]; 
    [self didChangeValueForKey:@"Districts" withSetMutation:NSKeyValueMinusSetMutation usingObjects:changedObjects]; 
    [changedObjects release]; 
} 

- (void)addDistricts:(NSSet *)value {  
    [self willChangeValueForKey:@"Districts" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Districts"] unionSet:value]; 
    [self didChangeValueForKey:@"Districts" withSetMutation:NSKeyValueUnionSetMutation usingObjects:value]; 
} 

- (void)removeDistricts:(NSSet *)value { 
    [self willChangeValueForKey:@"Districts" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
    [[self primitiveValueForKey:@"Districts"] minusSet:value]; 
    [self didChangeValueForKey:@"Districts" withSetMutation:NSKeyValueMinusSetMutation usingObjects:value]; 
} 

Answer 1

在Xcode 4.x之前，自动生成的代码确实为方法生成了头定义。标题的丢失可能是X4的非苹果式隐蔽质量控制的另一个受害者。

标题实际上只需要intellisense或其他人机界面工具。 @dynamic预处理器命令将告诉编译器，这些方法基于命名约定存在。在运行时，Core Data将通过发送respondsToSelector到实例化的对象来检查该类，否则它将使用直接的键值方法。

您可以随时使用手动或构建的小脚本自行添加它们。这很痛苦，但显然X4设计专注于管理大型多产品项目，并且他们放弃了一些较老的基本东西。

Answer 2

接口方法仅需要静态类型检查，并且仅在编译时使用，如果方法的调用都在运行时，则接口方法声明动态地创建不要做任何事情。