ios - 为什么我的 CoreData 实体对象是未知的？

Question

当我构建应用程序时，所有 CoreData 对象类都出现以下错误:

我确实在 Prefix.pch 中包含了 CoreData 库。另外，每次运行构建时，错误数量从 48 到 62 不等。

似乎 Xcode 根本无法识别它们的定义。我应该如何解决这个问题？

这是头文件:

#import <Foundation/Foundation.h>
#import <CoreData/CoreData.h>
#import "Activities.h"

@class Activities;

@interface Projects : NSManagedObject

@property (nonatomic, retain) NSString * name;
@property (nonatomic, retain) NSString * information;
@property (nonatomic, retain) NSDate * date;
@property (nonatomic, retain) NSSet *activities;
@end

@interface Projects (CoreDataGeneratedAccessors)

- (void)addActivitiesObject:(Activities *)value;
- (void)removeActivitiesObject:(Activities *)value;
- (void)addActivities:(NSSet *)values;
- (void)removeActivities:(NSSet *)values;

+(NSArray*)retrieveProjects;

-(void)setName:(NSString*)name information:(NSString*) information date:(NSDate *) date;

@end

以及 .m 文件:

#import "Projects.h"

@implementation Projects

@dynamic name;
@dynamic information;
@dynamic date;
@dynamic activities;

+(NSArray*)retrieveProjects
{
    //Retrieve all project entries and return as an NSArray here
}

-(void)setName:(NSString*)name information:(NSString*) information date:(NSDate *) date
{
    // Set a Projects object’s attributes;
}

@end

Answer 1

尝试将#import“Activities.h”放入.m文件中，也许它的包含问题导致U包含这个.hActivities.h我想