我有一个简单的循环:
for(Object_ *obj in not.object)
{
......
Object *objStor = [NSEntityDescription insertNewObjectForEntityForName:@"Object" inManagedObjectContext:context];
.....
}
'Object_' 类的接口如下所示:
@interface Object_ : NSObject
@property (nonatomic, strong) NSNumber * id;
@property (nonatomic, strong) NSString * name;
@property (nonatomic, strong) NSNumber * review_id;
.
.
.
.
@end
“对象”类的接口(由 xCode 为核心数据模式创建)如下所示:
@interface Object : NSManagedObject
@property (nonatomic, retain) NSNumber * id;
@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSNumber * rating;
.
.
.
.
@end
我收到一个错误:
*** NSForwarding: warning: object 0x1a1bb48 of class 'Object' does not implement methodSignatureForSelector: -- trouble ahead
*** NSForwarding: warning: object 0x1a1bb48 of class 'Object' does not implement doesNotRecognizeSelector: -- abort
在线解决方案说将“对象”类声明为 NSObject 的子类。但是我不能将继承更改为 NSObject,因为这会导致核心数据模型失败。
我在它上面还有另一条线,
Subject *subStor = [NSEntityDescription insertNewObjectForEntityForName:@"Subject" inManagedObjectContext:context];
效果很好。是什么导致了错误?