Gridea

KVC与KVO简介

• KVC
  

KVC（Key-value coding）是一种间接更改对象状态的方式。

 官方文档描述：

 Key-value coding is a mechanism for accessing an  object’s properties indirectly, using strings to identify properties, rather than through invocation of an accessor method or accessing them directly through instance variables. In essence, key-value coding defines the patterns and method signatures that your application’s accessor methods implement.