Repeat the same code in several classes in Objective-C - objective-c

Question

I have this two functions in my project, that will be identical across several classes.
I cannot create a common base class, since they inherit from different classes (some are UIViewControllers, some are NSObjects, etc.).
I tried with categories, but again, as I don't have a base class, there isn't a single place where to put them. Neither I want the functions to be available in all UIViewControllers, so creating a category there wouldn't help.
How can I add this code to the classes I want without copy & paste?
Just for the record, I'm implementing dynamic log levels in cocoalumberjack, and the code I need to add is the following:
static int ddLogLevel = LOG_LEVEL_WARN;
+ (int)ddLogLevel
{
return ddLogLevel;
}
+ (void)ddSetLogLevel:(int)logLevel
{
ddLogLevel = logLevel;
}

Answer 1

A bit messy perhaps, but you could use a #define. Create a header file with the following in it:
//LoggingCode.h
#define LOGGING_CODE static int ddLogLevel = LOG_LEVEL_WARN; \
\
+ (int)ddLogLevel \
{ \
return ddLogLevel; \
} \
\
+ (void)ddSetLogLevel:(int)logLevel \
{ \
ddLogLevel = logLevel; \
}
Make sure the header file is included whenever you want to use this code, and just insert LOGGING_CODE where you want it.
#include "LoggingCode.h"
LOGGING_CODE
The C preprocessor will do the rest.

Answer 2

Since you can't inherit from a common class, you could make a static class that you would call from both of your other classes.
Edit:
StaticClass.h
+(int)commonddLogLevel;
+(void)commonddSetLogLevel:(int)logLevel;
Class1.h
+(int)ddLogLevel;
+(void)ddSetLogLevel:(int)logLevel;
Class1.m
+(int)ddLogLevel {
[StaticClass commonddLogLevel];
}
+(void)ddSetLogLevel:(int)logLevel {
[StaticClass commonddSetLogLevel:logLevel];
}
Class2.h
+(int)ddLogLevel;
+(void)ddSetLogLevel:(int)logLevel;
Class2.m
+(int)ddLogLevel {
[StaticClass commonddLogLevel];
}
+(void)ddSetLogLevel:(int)logLevel {
[StaticClass commonddSetLogLevel:logLevel];
}