クラス階層表示 ref: http://qiita.com/items/1823

gistfile1.m

void printClassHierarchy(id object)
{
    NSMutableArray *names = [NSMutableArray array];
    Class objClass = [object class];
    Class rootClass = [NSObject class];
    while(objClass != rootClass) {
        [names addObject:NSStringFromClass(objClass)];
        objClass = [objClass superclass];
    }
    [names addObject:NSStringFromClass(rootClass)];

    int i = 0;
    for(NSString *name in [names reverseObjectEnumerator]) {
        fprintf(stderr, "%*s%s\n", i++ * 4, " ", [name UTF8String]); 
    }
}