isKindOfClass,isMemberOfClass使用备忘

isMemberOfClass 判断是否是属于这类的实例
isKindOfClass 判断是否是这个类或者这个类的子类的实例

if ([teacher isKindOfClass:[Teacher class]]) { 
NSLog(@"teacher 是 Teacher类或Teacher的子类"); 
}

if ([teacher isMemberOfClass:[Person class]]) { 
NSLog(@"teacher 是 teacher Teacher类的成员"); 
}

//遍历子视图
for (UIButton *btn in self.headView.subviews)
{
     if ([btn isKindOfClass:[HotWordBtn class]])
    {
       btn.selected = NO;
    }
}