isMemberOfClass和isKindOfClass

实例方法对应的A为类
类方法对应的A为元类

  1. //isMemberOfClass 直接判断
  2. //isKindOfClass  调用者可循环 ([a class]->superclass  == A)
  3.   [a isMemberOfClass:A ];
  4.   [a isKindOfClass:A];
  6. Man *man = [Man new];
  7. BOOL a = [man isMemberOfClass:[Man class]]; //1
  8. BOOL b = [man isKindOfClass:[Man class]];  //1
  9. BOOL c = [Man isKindOfClass:[NSObject class]]; //1
  10. BOOL d = [Man isMemberOfClass:[NSObject class]]; //0