[iOS 8] Swiftでデザインパターン No.4 Factory Method

			
			
class Product {
}

		

			
			
class ConcreteProduct: Product {
}

		

			
			
class Creator {
    func factoryMethod() -> Product {
        fatalError("must be overridden")
    }
    func anOperation() {
        let product = factoryMethod()
        println("Product is (product)")
    }
}

		

			
			
class ConcreteCreator: Creator {
    override func factoryMethod() -> Product {
        return ConcreteProduct()
    }
}

		

			
			
ConcreteCreator().anOperation()

		

			
			
Product is FactoryMethod.ConcreteProduct