NSString is empty

Question

How do you test if an NSString is empty? or all whitespace or nil? with a single method call?

Answer 1

I'm using this define as it works with nil strings as well as empty strings:

#define STR_EMPTY(str)  \
    str.length == 0

Actually now its like this:

#define STR_EMPTY(str)  \
    (![str isKindOfClass:[NSString class]] || str.length == 0)