+(BOOL) isKindOfClass: (Class)aClass: aClass为self的元类对象，或者元类对象的父对象，才返回YES
-(BOOL) isKindOfClass: (Class)aClass：如果self为实例对象，aClass传入的是类对象或者类对象的父对象时，或者self为类对象，aClass为元类对象或者元类对象的父对象时，才返回YES
+(BOOL) isMemberOfClass: (Class)aClass：aClass为self的元类对象，才返回YES
-(BOOL) isMemberOfClass: (Class)aClass：如果self为实例对象，aClass传入的是类对象，或者self为类对象，aClass为元类对象，才返回YES
-
isKindOfClass和isMemberOfClass的共通点是self与aClass的关系，即：
aClass、object_getClass(self)进行比较 - 苹果官方对外暴漏的API中没有
+(BOOL) isKindOfClass: (Class)aClass和+(BOOL) isMemberOfClass: (Class)aClass两个类方法，但其实是有的，以下方法可以猜想并验证
如何查看方法类型01.png
如何查看方法类型02.png
或者通过控制台打印IMP查看
如何查看方法类型03.png
以下是模拟内部实现的代码
int GSObjCIsKindOf(Class cls, Class other)
{
while (cls != Nil)
{
if (cls == other)
{
return YES;
}
cls = class_getSuperclass(cls);
}
return NO;
}
+ (BOOL) isKindOfClass: (Class)aClass
{
Class class = object_getClass(self);
return GSObjCIsKindOf(class, aClass);
}
- (BOOL) isKindOfClass: (Class)aClass
{
Class class = object_getClass(self);
return GSObjCIsKindOf(class, aClass);
}
+ (BOOL) isMemberOfClass: (Class)aClass
{
Class class = object_getClass(self);
return (class == aClass) ? YES : NO;
}
- (BOOL) isMemberOfClass: (Class)aClass
{
Class class = object_getClass(self);
return (class == aClass) ? YES : NO;
}
