Get the class of calling object

gistfile1.m

NSString *sourceString = [[NSThread callStackSymbols] objectAtIndex:1];
NSCharacterSet *separatorSet = [NSCharacterSet characterSetWithCharactersInString:@" -[]+?.,"];
NSMutableArray *array = [NSMutableArray arrayWithArray:[sourceString  componentsSeparatedByCharactersInSet:separatorSet]];
Class callerClass =  NSClassFromString([array objectAtIndex:3]);