BlockTransferValue

BlockTransferValue ###1. 通过block，Second View 返回把 Textfield 的值带回道 First View. ###2. NSOpration，GCD分别实现loading web view code的过程，中间有indicator animating，列举所有GCD系统提供的dispatch method, 推出到后台以后用GCD实现10分钟驻留 ###3. 用UIControl，UITapGestureRecognizer实现键盘隐藏 Where I learn? You can do it absolutely. [一毛 ] [唐巧的技术博客] [SwingLife的专栏]