runtime——Class——基本信息

最新推荐文章于 2024-09-08 01:00:00 发布

mardax

最新推荐文章于 2024-09-08 01:00:00 发布

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分类专栏： runtime 文章标签： Class name version

本文链接：https://blog.youkuaiyun.com/mardax/article/details/65633417

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本文通过示例代码展示了Objective-C中类和元类的基本属性获取与设置方法，包括名称和版本号，并分析了它们之间的关系及特性。

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api

const char *name                                         OBJC2_UNAVAILABLE;
long version                                             OBJC2_UNAVAILABLE;

OBJC_EXPORT const char *class_getName(Class cls) 
     __OSX_AVAILABLE_STARTING(__MAC_10_5, __IPHONE_2_0);
OBJC_EXPORT int class_getVersion(Class cls)
    __OSX_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);
OBJC_EXPORT void class_setVersion(Class cls, int version)
    __OSX_AVAILABLE_STARTING(__MAC_10_0, __IPHONE_2_0);

应用

@interface FBAnimal : NSObject

@end

@implementation FBAnimal

@end

- (void)class_info
{
    NSObject *object = [[NSObject alloc] init];
    FBAnimal *animal = [[FBAnimal alloc] init];
    
    Class objectClsObj = object_getClass(object);
    Class objectClsObj_isa = object_getClass(objectClsObj);
    
    Class animalClsObj = object_getClass(animal);
    Class animalClsObj_isa = object_getClass(animalClsObj);
    
    NSLog(@"objectClsObj name: %s, objectMetaClsObj name: %s", class_getName(objectClsObj), class_getName(objectClsObj_isa));
    NSLog(@"animalClsObj name: %s, animalMetaClsObj name: %s", class_getName(animalClsObj), class_getName(animalClsObj_isa));
    
    NSLog(@"objectClsObj ver: %d, objectMetaClsObj ver: %d", class_getVersion(objectClsObj), class_getVersion(objectClsObj_isa));
    NSLog(@"animalClsObj ver: %d, animalMetaClsObj ver: %d", class_getVersion(animalClsObj), class_getVersion(animalClsObj_isa));
    
    class_setVersion(objectClsObj, 5);
    class_setVersion(objectClsObj_isa, 8);
    class_setVersion(animalClsObj, 5);
    class_setVersion(animalClsObj_isa, 8);
    
    NSLog(@"objectClsObj ver: %d, objectMetaClsObj ver: %d", class_getVersion(objectClsObj), class_getVersion(objectClsObj_isa));
    NSLog(@"animalClsObj ver: %d, animalMetaClsObj ver: %d", class_getVersion(animalClsObj), class_getVersion(animalClsObj_isa));
}

output：

objectClsObj name: NSObject, objectMetaClsObj name: NSObject
animalClsObj name: FBAnimal, animalMetaClsObj name: FBAnimal
objectClsObj ver: 0, objectMetaClsObj ver: 7
animalClsObj ver: 0, animalMetaClsObj ver: 7
objectClsObj ver: 5, objectMetaClsObj ver: 8
animalClsObj ver: 5, animalMetaClsObj ver: 8