Question

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：

@interface Object_ : NSObject
@property (nonatomic, strong) NSNumber * id;
@property (nonatomic, strong) NSString * name;
@property (nonatomic, strong) NSNumber * review_id;
.
.
.
.
@end

'Object'类的接口（由xCode for Core Data Schema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

在线解决方案称将'Object'Class声明为NSObject的子类。但我无法将继承更改为NSObject，因为这会导致Core Data Model失败。

我上面还有另一条线，

Subject *subStor = [NSEntityDescription insertNewObjectForEntityForName:@"Subject" inManagedObjectContext:context];

完美无缺。导致错误的原因是什么？

Answer 1

我猜你有一个命名空间冲突。 Obj-C有一个名为Object的班级，会与班级Object发生碰撞。

将您的Object重命名为其他内容。

类没有实现doesNotRecognizeSelector

1 个答案: