Inspired by NSDictionaryOfVariableBindings.

DictionaryOfEnumBindingsWorker.m

#define DictionaryOfEnumBindings(...) DictionaryOfEnumBindingsWorker(@"" # __VA_ARGS__, __VA_ARGS__, nil)
NSDictionary *DictionaryOfEnumBindingsWorker(NSString *commaSeparatedKeysString, int firstValue, ...) {
    NSMutableDictionary *enums = [NSMutableDictionary dictionary];
    NSMutableArray *names = [[commaSeparatedKeysString componentsSeparatedByString:@","] mutableCopy];
    va_list ap;
    va_start(ap, firstValue);
    
    NSCharacterSet *whiteSpace = [NSCharacterSet whitespaceAndNewlineCharacterSet];
    
    NSString *firstPaddedName = [names objectAtIndex:0];
    enums[@(firstValue)] = [firstPaddedName stringByTrimmingCharactersInSet:whiteSpace];
    [names removeObjectAtIndex:0];
    
    for (NSString *paddedName in names) {
        int value = va_arg(ap, int);
        enums[@(value)] = [paddedName stringByTrimmingCharactersInSet:whiteSpace];
    }
    va_end(ap);
    return [enums copy];
}

Use:

NSDictionary *enumNames = DictionaryOfEnumBindings(NSTextAlignmentLeft, NSTextAlignmentCenter, NSTextAlignmentRight);