property with 'retain(or strong)' attribute must be of object type”
#import <Foundation/Foundation.h>
#import "Project.h"
#import "Member.h"
@class Member;
@class Project;
@interface Day : NSObject{
...
}
@end
#import <Foundation/Foundation.h>
#import "Project.h"
#import "Member.h"
@class Member;
@class Project;
@interface Day : NSObject{
...
}
@end