How to use NSLog and print only for debugging? http://swiftiostutorials.com/use-nslog-debugging/

Log.h

#import <Foundation/Foundation.h>

@interface Log : NSObject

extern void SSLog(BOOL releaseLog, NSString *format, ...) NS_FORMAT_FUNCTION(2,3);

@end

Log.m

#import "Log.h"

@implementation Log

void SSLog(BOOL releaseLog, NSString *format, ...)
{
#ifndef DEBUG
    if (releaseLog)
    {
#endif
        va_list argumentList;
        va_start(argumentList, format);
        NSLogv(format, argumentList);
        va_end(argumentList);
#ifndef DEBUG
    }
#endif
}

@end

NSLogImports.h

/******
 NSLog defines
 
 NSLog works only in the debug mode
 To log in release mode, ReleaseLog should be used
 ******/
#define NSLog(...) SSLog(NO, __VA_ARGS__)
#define ReleaseLog(...) SSLog(YES, __VA_ARGS__)