In Objective-c how can we have a variable whose scope is the whole class (but doesn't include subclasses)

Question

I created tons of subclasses of UITableViewCell. Each of which is a subclass of an additional BGBaseTableViewCell class.

When asked for height, I think it\'ll be useful

Answer 1

Why didn't I think of it.

Make the static variable a dictionary and set the class names as the keys :)

Ladies and gentlemen, children of all ages. Sharen Eayrs production proudly presents, statically protected variables:

static NSMutableDictionary * defaultHeightDictionary= nil;
static NSMutableDictionary * defaultBoundsDictionary =nil;
//static CGFloat defaultHeightSet = 0;

+(void)initialize
{
    BGBaseTableViewCell * typical = [[self alloc]init];

    if (defaultHeightDictionary==nil) {
        defaultHeightDictionary = [NSMutableDictionary dictionary];
        defaultBoundsDictionary = [NSMutableDictionary dictionary];
    }
    [defaultHeightDictionary setValue:@(typical.bounds.size.height) forKey:NSStringFromClass([self class])];
    CGRect bounds = typical.bounds;

    NSValue * boundsValue = [NSValue valueWithCGRect:bounds];
    [defaultHeightDictionary setValue:boundsValue forKey:NSStringFromClass([self class])];


}
+(CGFloat) defaultHeight
{
    NSNumber * result = [defaultHeightDictionary valueForKey:NSStringFromClass([self class])];
    return result.floatValue;
}

+(CGRect) defaultBounds
{
    NSValue * result = [defaultBoundsDictionary valueForKey:NSStringFromClass([self class])];
    return [result CGRectValue];
}

Answer 2

Visible in whole class but not for subclasses? You can try this code for your .m file:

@interface ClassYouNeed ()
static VariableClass* variableVisibleInClassButNotInSubclass;
@end

Just make a "hidden" category on your class near your implementation, it should work.