How to detect calling class in objective c static method

Question

How does one detect the calling class from within a static method such that if the class is subclassed the subclass is detected? (See comment inside MakeInstance)

@interface Widget : NSObject
+ (id) MakeInstance;
@end

@implementation Widget
+ (id) MakeInstance{
    Class klass = //How do I get this?
    id instance = [[klass alloc] init];
    return instance;
}
@end

@interface UberWidget : Widget
//stuff
@end

@implementation UberWidget
//Stuff that does not involve re-defining MakeInstance
@end

//Somewhere in the program
UberWidget* my_widget = [UberWidget MakeInstance];

Answer 1

I believe the appropriate solution for what you are trying to accomplish is this:

+ (id) MakeInstance{
    id instance = [[self alloc] init];
    return instance;
}

And as Cyrille points out, it should probably return [instance autorelease] if you want to follow convention (and aren't using ARC).

Answer 2

UIAdam's solution is perfectly fine for your case. Although if you want to detect, more specifically, from which class is you method called, use [self class] on objects, or simply self for classes.