Objective C 设计模式(英文版)

本书章节内容：Chapter1:Hello,DesignPatterns!Chapter2:ACaseStudy:DesigninganAppChapter3:PrototypeChapter4:FactoryMethodChapter5:AbstractFactoryChapter6:BuilderChapter7:SingletonChapter8:AdapterChapter9:BridgeChapter9:BridgeChapter11:MediatorChapter12:ObserverChapter13:CompositeChapter14:Ite