ログ出力をもっと便利に簡単にするマクロ ref: http://qiita.com/sora0077@github/items/ea0cf4a1a2ec3f0333d7

AppDelegate.m

id var1 = @"hoge";
VARLOG(var1);

id var2 = @{@"huga": @"hoge"};
VARLOG(var1, var2);

// output
// -[AppDelegate application:didFinishLaunchingWithOptions:] at LINE:78
// {
//      var1 = hoge;
// }
//
// -[FKAppDelegate application:didFinishLaunchingWithOptions:] at LINE:81
// {
//      var1 = hoge;
//      var2 =     {
//         huga = hoge;
//     };
// }

file1.txt

VARLOG(@[@"hoge", @"huga"]); -> NG
VARLOG([NSString stringWithFormat:@"%@", @"hoge"]); -> NG

ver.1.0.0

#define VAR(...) _VAR(@""#__VA_ARGS__, __VA_ARGS__)
//#define VAR(var, ...) NSDictionaryOfVariableBindings(var, ##__VA_ARGS__)


#define _VAR(...) \
    ^NSString *(NSString *format, ...) {\
        va_list args;\
        format = [format stringByReplacingOccurrencesOfString:@", " withString:@","];\
        format = [format stringByReplacingOccurrencesOfString:@" ," withString:@","];\
        NSArray *keys = [format componentsSeparatedByString:@","];\
        \
        NSMutableArray *objects = [NSMutableArray arrayWithCapacity:keys.count];\
        \
        va_start(args, format);\
        for (int i = 0; i < keys.count; i++) {\
            id object = va_arg(args, id);\
            object = object ? object : @"nil";\
            [objects addObject:object];\
        }\
        va_end(args);\
        \
        NSMutableString *buffer = [NSMutableString stringWithString:@"{\n"];\
        \
        [objects enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {\
            id key = [keys objectAtIndex:idx];\
            id description = obj;\
            if ([obj respondsToSelector:@selector(descriptionWithLocale:indent:)]) {\
                description = [obj descriptionWithLocale:nil indent:1];\
            }\
            [buffer appendFormat:@"\t%@ = %@;\n", key, description];\
        }];\
        \
        [buffer appendString:@"}"];\
        return buffer;\
    }(__VA_ARGS__)

#define VARLOG(var, ...) NSLog(@"\n%s at LINE:%d\n%@\n\n", __func__, __LINE__, VAR(var, ##__VA_ARGS__))