目标C:如何继承加载在父类中的类别方法? [英] Objective C: how to inherit category methods loaded in a parent class?

问题描述

在我的项目中，我正在使用NSObject+Properties.h类别(请参阅aqtoolkit: https://github.com/AlanQuatermain/aqtoolkit/blob/master/Extensions/NSObject%2BProperties.h )

In my project, I am using the NSObject+Properties.h category (see aqtoolkit: https://github.com/AlanQuatermain/aqtoolkit/blob/master/Extensions/NSObject%2BProperties.h)

然后有一个我声明为

#import <Foundation/Foundation.h>
#import "NSObject+Properties.h"

@interface GFDictionaryInitiable : NSObject
...

然后我有几个GFDictionaryInitiable的子类，例如GFRestaurant:

I then have several subclasses of GFDictionaryInitiable, such as GFRestaurant:

#import <Foundation/Foundation.h>

#import "GFDictionaryInitiable.h"

@interface GFRestaurant : GFDictionaryInitiable
...

我的问题是我无法访问子类的NSObject+Properties类别中定义的方法.例如，我得到了错误:

My problem is that I cannot access methods defined in the NSObject+Properties category in my subclasses. For example I get the error:

-[GFRestaurant hasPropertyNamed:]: unrecognized selector sent to instance 0x2e57240

如何让我的所有子类继承"父类中加载的类别的方法?

How can I have all my subclasses 'inherit' the category's methods that are loaded in the parent class?

推荐答案

当您获得运行时异常(而不是编译器错误)时，我认为您忘记了 将"NSObject + Properties.m"添加到目标.选择文件并检查 文件检查器中的目标成员身份"复选框.

As you get a runtime exception, and not a compiler error, I assume that you forgot to add "NSObject+Properties.m" to your target. Select the file and check the "Target Membership" checkbox in the File inspector.

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