WSDropMenuView
类似美团的多级选择列表 － 简单易用 (史上最简洁的 三级列表 ，并且很容易改造成两级和一级或者四级,实现代码不超过550行); （来了帮忙点个 赞 star －－ 好人一生平安）
![预览图] [预览图]:https://github.com/PerfectShen/WSDropMenuView/blob/master/dropMenu.gif "欢迎私信我哦" 我的博客
初始化对象
WSDropMenuView *dropMenu = [[WSDropMenuView alloc] initWithFrame:CGRectMake(0, 60, self.view.frame.size.width, 40)];
dropMenu.dataSource = self;
dropMenu.delegate =self;
[self.view addSubview:dropMenu];
实现代理方法 (简单易用 ， 不繁琐)
- (NSInteger)dropMenuView:(WSDropMenuView *)dropMenuView numberWithIndexPath:(WSIndexPath *)indexPath; //dataSource
- (NSString *)dropMenuView:(WSDropMenuView *)dropMenuView titleWithIndexPath:(WSIndexPath *)indexPath //dataSource
- (void)dropMenuView:(WSDropMenuView *)dropMenuView didSelectWithIndexPath:(WSIndexPath *)indexPath //delegate