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Design Patterns in Swift Ch1 Factory Method

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Chihyang Li

GoF Design Patterns, a brief introduction about Creational patterns, Simple Factory and Factory Method

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Design Patterns in Swift Ch 1 Creational Patterns Simple Factory Factory Method Sai Li @ Yowoo Tech. taipingeric@gmail.com 2017/4/25
Agenda ? Creational Patterns ? Simple Factory ? Factory Method 2
References ЦՄܛ? ? by Teddy Chen 3 ?һ}?Ա
1. Factory Method 2. Strategy 3. Decorator 4. Composite 5. Iterator 6. Template Method 7. Abstract Factory 8. Builder 9. Singleton 10. Proxy 11. Adaptor Kerievsky Joshua: A Learning Guide To Design Patterns 12. Bridge 13. Mediator 14. Observer 15. Chain of Responsibility 16. Memento 17. Command 18. Prototype 19. State 20. Visitor 21. Flyweight 22. Interpreter 23. Facade Kerievsky Joshua: A Learning Guide To Design Patterns
purpose creational structural behavioral scope class Factory Method Adaptor Interpreter Template Method object Abstract Factory Builder Prototype Singleton Adapter Bridge Composite Decorator Facade Flyweight Proxy Chain of Responsibility Command Iterator Mediator Memento Observer State Strategy Visitor
OOP ? DIP: depends on interface 6
? Swift ? let myPhone = Phone() ? Java ? Phone myPhone = new Phone() ? Javascript ? var myPhone = new Phone() init()
Creational Patterns ? Abstracting initialization process ? Theme 1. Encapsulate concrete class knowledge 2. Hiding instance creation and composition by knowing interface only 3. Flexibility: What, Who, How, When 4. static -> compiling time, dynamic -> runtime 8
Simple Factory
Design Patterns in Swift Ch1 Factory Method
Design Patterns in Swift Ch1 Factory Method
Design Patterns in Swift Ch1 Factory Method
Design Patterns in Swift Ch1 Factory Method
Design Patterns in Swift Ch1 Factory Method
Factory Method
Factory Method De?ne an interface for creating an object, but let subclasses decide which class to instantiate. Factory Method lets a class defer instantiation to subclasses. 16 x?Ľ?棬׌?eQԓw ?һN Factory Methodʹew(t?)?e ̎
Product Creator
created objects interface concrete implementation 1.de?ne Factory Method Interface (2. default implementation) override Factory Method to return ConcreteProduct let product = FactoryMethod() return ConcreteProduct()
<< create >>
Design Patterns in Swift Ch1 Factory Method
factory method
Design Patterns in Swift Ch1 Factory Method
extension
Simple Factory ? vs.? Factory Method
w/o default implementation
References ? ЦՄܛ? ? Kerievsky Joshua: A Learning Guide To Design Patterns 26 Q & A

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Design Patterns in Swift Ch1 Factory Method