CoreData的简单使用
先上一个URL：
http://blog.csdn.net/rhljiayou/article/details/18037729/
（未完，待更）
http://blog.csdn.net/rhljiayou/article/details/18037729/
（未完，待更）
Delegate
Each delegate is responsible for a specific role or task to keep the system simple and clean.Whenever an object needs to perform a certain task, it depends on another object to handle it. This is usually known as “separation of concerns” in software design.
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