objective-c – 无法从对象创建BOOL

概述我正在按照mac os x第4版的指南 cocoa编程进行 *** 作.在第32章中我搞砸了代码,我没有备份它,所以我不得不从大书呆子牧场下载解决方案. 该项目涉及核心数据关系,有一个班级员工和一个班级部门. Employee.h： #import <Foundation/Foundation.h>#import <CoreData/CoreData.h>@class Department;@i 我正在按照mac os x第4版的指南 cocoa编程进行 *** 作.在第32章中我搞砸了代码,我没有备份它,所以我不得不从大书呆子牧场下载解决方案.
该项目涉及核心数据关系,有一个班级员工和一个班级部门.

Employee.h：

#import <Foundation/Foundation.h>#import <CoreData/CoreData.h>@class Department;@interface Employee : NSManagedobject@property (nonatomic,copy) Nsstring * firstname;@property (nonatomic,copy) Nsstring * lastname;@property (nonatomic,retain) Department *department;@property (nonatomic,Readonly) Nsstring *fullname;@end

Employee.m：

#import "Employee.h"#import "Department.h"@implementation Employee@dynamic firstname;@dynamic lastname;@dynamic department;+ (NSSet *)keypathsForValuesAffectingFullname{    return [NSSet setWithObjects:@"firstname",@"lastname",nil];}- (Nsstring *)fullname{    Nsstring *first = [self firstname];    Nsstring *last = [self lastname];    if (!first)        return last;    if (!last)        return first;    return [Nsstring stringWithFormat:@"%@ %@",first,last];}@end

Department.h：

#import <Foundation/Foundation.h>#import <CoreData/CoreData.h>@interface Department : NSManagedobject@property (nonatomic,retain) Nsstring * deptname;@property (nonatomic,retain) NSSet *employees;@property (nonatomic,retain) NSManagedobject *manager;@end@interface Department (CoreDataGeneratedAccessors)- (voID)addEmployeesObject:(NSManagedobject *)value;- (voID)removeEmployeesObject:(NSManagedobject *)value;- (voID)addEmployees:(NSSet *)values;- (voID)removeEmployees:(NSSet *)values;@end

部门：

#import "Department.h"#import "Employee.h"@implementation Department@dynamic deptname;@dynamic employees;@dynamic manager;- (voID)addEmployeesObject:(Employee *)value{    NSLog(@"Dept %@ adding employee %@",[self deptname],[value fullname]);    NSSet *s = [NSSet setWithObject:value];    [self willChangeValueForKey:@"employees"                withSetMutation:NSkeyvalueUnionSetMutation                   usingObjects:s];    [[self primitiveValueForKey:@"employees"] addobject:value];    [self dIDChangeValueForKey:@"employees"               withSetMutation:NSkeyvalueUnionSetMutation                  usingObjects:s];}- (voID)removeEmployeesObject:(Employee *)value{    NSLog(@"Dept %@ removing employee %@",[value fullname]);    Employee *manager = (Employee *)[self manager];    if (manager == value) {        [self setManager:nil];    }    NSSet *s = [NSSet setWithObject:value];    [self willChangeValueForKey:@"employees"                withSetMutation:NSkeyvalueMinusSetMutation                   usingObjects:s];    [[self primitiveValueForKey:@"employees"] removeObject:value];    [self dIDChangeValueForKey:@"employees"               withSetMutation:NSkeyvalueMinusSetMutation                  usingObjects:s];}@end

我有那些核心数据关系和实体：

我还使用一些阵列控制器将核心数据值绑定到某些出口.
整个项目可以在“下载解决方案”中找到here.,第32章(与我的相同).
如果您需要更多代码来了解此错误,请告诉我：

2012-10-31 15:27:43.977 Departments[1229:303] Cannot create BOol from object () of class _NSControllerArrayProxy2012-10-31 15:27:43.989 Departments[1229:303] Cannot create BOol from object () of class _NSControllerArrayProxy

似乎不建议发布整个项目,但如果你说它没问题,我可以这样做.

PS：我’使用从解决方案下载的代码,它是相同的但它不起作用,可能是因为我有更高版本的xcode.

解决方法 看起来像绑定问题.您可能有一个“启用”或“隐藏”绑定(带有BOol)与无法转换为BOol的属性相关联. 总结

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