你好 请教个问题

[jj89757hhb]

class_addMethod([self.person class], @selector(guess), (IMP)guessAnswer, "v@:");
if ([self.person respondsToSelector:@selector(guess)]) {
//Method method = class_getInstanceMethod([self.xiaoMing class], @selector(guess));
[self.person performSelector:@selector(guess)];

} else{
    NSLog(@"Sorry,I don't know");
}

这个意思是不是如果没有 guess 方法 就调用 guessAnswer方法？