The Mediator pattern is used to define a centralized place where interactions among objects can be handled in one mediator object. Other objects don’t need to interact with each other directly, so it reduces dependency among them.
Mediator(Chapter 11 of Pro Objective-C Design Patterns for iOS)
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转载于:https://www.cnblogs.com/zhtf2014/archive/2012/04/23/2466683.html
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