3D广告牌
https://github.com/nicklockwood/iCarousel

IQKeyboardManager
https://github.com/hackiftekhar/IQKeyboardManager

简介：http://my.oschina.net/u/1418722/blog/384477

下拉框
http://www.oschina.net/p/kxmenu
KVO封装
https://github.com/facebook/KVOController

// create KVO controller with observer
FBKVOController *KVOController = [FBKVOController controllerWithObserver:self];
self.KVOController = KVOController;
// observe clock date property
[self.KVOController observe:clock keyPath:@"date" options:NSKeyValueObservingOptionInitial|NSKeyValueObservingOptionNew block:^(ClockView *clockView, Clock *clock, NSDictionary *change) { 
// update clock view with new value
 clockView.date = change[NSKeyValueChangeNewKey];
}];

web预加载，加载缓存页面
https://github.com/ming1016/STMURLCache

tableView 滑动删除
https://github.com/MortimerGoro/MGSwipeTableCell