social

//: A UIKit based Playground for presenting user interface

import UIKit

class ContextClass {

    enum Social {
        case vk
        case fb
    }

    func getStrategy(type: Social) -> SocialNetworkStrategy {
        switch type {
        case .vk:
            return VKStrategy()
        case .fb:
            return FBStrategy()
        }
    }
}

protocol SocialNetworkStrategy: class {
    func login()
    func logout()
    func sharePost()
}

class VKStrategy: SocialNetworkStrategy {
    func login() {
        //do something
        print("vklogin")
    }

    func logout() {
        //do something
    }

    func sharePost() {
        //do something
    }


}

class FBStrategy: SocialNetworkStrategy {
    func login() {
        //do something
        print("fblogin")
    }

    func logout() {
        //do something
    }

    func sharePost() {
        //do something
    }
}

class GoogleStrategy: SocialNetworkStrategy {
    func login() {
        //do something
    }

    func logout() {
        //do something
    }

    func sharePost() {
        //do something
    }

}

// client
let context = ContextClass()
let social = context.getStrategy(type: .vk)
social.login()