酸梅拯救地球

摘要： 转自http://blog.csdn.net/yhawaii/article/details/7442529nil:A null pointer to an Objective-Cobject.( #define nil ((id)0) )Nil: A null pointer to an Objective-Cclass.NULL: A null pointer to anything else, isforC-style memory pointers.( #define NULL ((void *)0) )NSNull: A class defines a singleton objec 阅读全文

摘要： 1.For each view controller you choose to preserve, you also need to decide on how you want to restore it later. UIKit offers two ways to recreate objects. You can let your app delegate recreate it or you can assign a restoration class to the view controller and let that class recreate it. Arestorati 阅读全文