我有如下一個Entity.
#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
@class SubItem;
@interface Item : NSManagedObject
{
@private
}
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSOrderedSet *subitems;
@end
@interface Item (CoreDataGeneratedAccessors)
- (void)insertObject:(SubItem *)value inSubitemsAtIndex:(NSUInteger)idx;
- (void)removeObjectFromSubitemsAtIndex:(NSUInteger)idx;
- (void)insertSubitems:(NSArray *)value atIndexes:(NSIndexSet *)indexes;
- (void)removeSubitemsAtIndexes:(NSIndexSet *)indexes;
- (void)replaceObjectInSubitemsAtIndex:(NSUInteger)idx withObject:(SubItem *)value;
- (void)replaceSubitemsAtIndexes:(NSIndexSet *)indexes withSubitems:(NSArray *)values;- (void)addSubitemsObject:(SubItem *)value;
- (void)removeSubitemsObject:(SubItem *)value;
- (void)addSubitems:(NSOrderedSet *)values;
- (void)removeSubitems:(NSOrderedSet *)values;
@end
#import "Item.h"
#import "SubItem.h"
@implementation Item
@dynamic name;
@dynamic subitems;
@end
可以看出我這個Item是能夠調(diào)用方法- (void)addSubitems:(NSOrderedSet *)values;的拒啰。
然而當(dāng)我如下操作時，卻發(fā)生了錯誤市埋。
Item *item = [NSEntityDescription insertNewObjectForEntityForName:@"Item" inManagedObjectContext:self.managedObjectContext];
item.name = @"FirstItem";
SubItem *subItem = [NSEntityDescription insertNewObjectForEntityForName:@"SubItem" inManagedObjectContext:self.managedObjectContext];
[item addSubitemsObject:subItem];
錯誤信息如下：
*** -[NSSet intersectsSet:]: set argument is not an NSSet
我翻閱資料之后得知，這是apple自動生成代碼的bug恕刘。
如何修復(fù)這個bug呢缤谎？
這里有一個比較討巧的辦法：重寫- (void)addSubitems:(NSOrderedSet *)values;這個方法。
- (void)addSubitemsObject:(SubItem *)value {
NSMutableOrderedSet* tempSet = [NSMutableOrderedSet orderedSetWithOrderedSet:self.subitems];
[tempSet addObject:value];
self.subitems = tempSet;
}
這樣就巧妙的繞過了自動生成的代碼褐着。
