让PetOwner
能够在程序的任何后期创建Cat
的新实例的正确(最简洁,最简洁)的方法是什么?
我们假设createAnotherAnimal
在获得对某些异步请求的响应后可以调用PetOwner
,因此在创建Cat
时会根据需要创建PetOwner
个实例。 1}}是不可能的。
我解决了注入工厂的问题,但我不相信这是解决问题的最佳方法,Swinject有哪些替代方案?
protocol AnimalType {
var name: String? { get set }
func sound() -> String
}
class Cat: AnimalType {
var name: String?
init(name: String?) {
self.name = name
}
func sound() -> String {
return "Meow!"
}
}
protocol PersonType {
func play() -> String
func createAnotherAnimal() -> Void
}
class PetOwner: PersonType {
var pets: [AnimalType] = []
let petFactory : AnimalFactory
init(petFactory : AnimalFactory) {
self.petFactory = petFactory
}
func createAnotherAnimal() {
let pet = petFactory.factoryMethod()
self.pets.append(pet)
}
func play() -> String {
if(pets.count>0) {
let pet : AnimalType = pets[0];
let name = pet.name ?? "someone"
return "I'm playing with \(name). \(pet.sound())"
} else {
return "No animals"
}
}
}
class AnimalFactory {
let factoryMethod : () -> AnimalType
init(factoryMethod: () -> AnimalType) {
self.factoryMethod = factoryMethod
}
}
// Create a container and register service and component pairs.
let container = Container()
container.register(AnimalType.self) { _ in Cat(name: "Mimi") }
container.register(PersonType.self) { r in PetOwner(petFactory: r.resolve(AnimalFactory.self)!) }
container.register(AnimalFactory.self){r in AnimalFactory(factoryMethod:{ () -> AnimalType in r.resolve(AnimalType.self)!}) }
// The person is resolved to a PetOwner with a Cat.
let person = container.resolve(PersonType.self)!
person.createAnotherAnimal()
print(person.play())