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2018.10.31 09:06

[ios] Swift 4 Singleton inheritance

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Swift 4 에서 싱글톤 객체를 사용하는 방법은 여러 가지가 있겠지만 이건 내가 자주 사용하는 두 가지..


# 변수 형태로 사용하기

ex) Singleton.shared.name = "Hello"

클래스를 상속 받아서 확장하기 어려움 ㅠㅠ


import UIKit


class Singleton

{

    static let shared: Singleton = {

        var instance = Singleton()

        instance.name = "default name"

        return instance

    }()

    

    var name: String = String()

}


class SingletonSubclass: Singleton {

    static var sharedSub: SingletonSubclass = {

        var instance = SingletonSubclass()

        instance.name = "default name"

        return instance

    }()

    

    var title: String = String()

}


Singleton.shared.name          // ""

SingletonSubclass.shared.name  // ""


SingletonSubclass.shared.name = "haha"

SingletonSubclass.sharedSub.title = "hello"


Singleton.shared.name             // ""

//Singleton.shared.title          // (error)

SingletonSubclass.shared.name     // "haha"

SingletonSubclass.sharedSub.title // "hello"




# 함수 형태로 사용하기

ex) Singleton.sharedInstance().name = "Hello"

클래스를 상속 받아 확장하기 편함

Sometimes you need to subclass your singleton…


import UIKit


class Singleton

{

    class func sharedInstance() -> Singleton {

        struct inner { static let instance = Singleton() }

        inner.instance

        return inner.instance

    }

    

    var name: String = String()

}


class SingletonSubclass: Singleton

{

    override class func sharedInstance() -> SingletonSubclass {

        struct inner { static let instance = SingletonSubclass() }

        return inner.instance

    }

    

    var title: String = String()

}


Singleton.sharedInstance().name          // ""

SingletonSubclass.sharedInstance().name  // ""


SingletonSubclass.sharedInstance().name = "haha"

SingletonSubclass.sharedInstance().title = "hello"


Singleton.sharedInstance().name          // ""

//Singleton.sharedInstance().title       // (error)

SingletonSubclass.sharedInstance().name  // "haha"

SingletonSubclass.sharedInstance().title // "hello"



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