爲什麼自動創建NSManagedObject子類沒有「適當」頭？

Question

如果我創建NSManagedObject子類的子類，我會在實現文件Business.m（例如）

上看到這些函數。在頭文件Business.h中沒有聲明這些函數。我必須親自添加

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

我想知道爲什麼我必須手動添加這些聲明？爲什麼不自動當我試圖生成子類？

下面是順便功能：

- (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，自動生成的代碼確實爲方法生成了頭定義。標題的丟失可能是X4的非蘋果式隱蔽質量控制的另一個受害者。

標題實際上只需要intellisense或其他人機界面工具。 @dynamic預處理器命令將告訴編譯器，這些方法基於命名約定存在。在運行時，Core Data將通過發送respondsToSelector到實例化的對象來檢查該類，否則它將使用直接的鍵值方法。

您可以隨時使用手動或構建的小腳本自行添加它們。這很痛苦，但顯然X4設計專注於管理大型多產品項目，並且他們放棄了一些較老的基本東西。

Answer 2

接口方法僅需要靜態類型檢查，並且僅在編譯時使用，如果方法的調用都在運行時，則接口方法聲明動態地創建不要做任何事情。