Swift设计模式之中介者模式

转自

• Swift设计模式

原文

• Design-Patterns-In-Swift

// 中介者模式// 来自网络：类之间的交互行为被统一放在Mediator的对象中，对象通过Mediator对象同其他对象交互，Mediator对象起着控制器的作用// 设计模式分类：行为型模式/// 对象抽象class Colleague {    let name: String    let mediator: Mediator    init(name: String, mediator: Mediator) {        self.name = name        self.mediator = mediator    }    /**     发送消息     - parameter message: 消息     */    func send(message: String) {        print("Colleague \(name) send: \(message)")        mediator.send(message, colleague: self)    }    /**     接收消息     - parameter message: 消息     */    func receive(message: String) {        assert(false, "Method should be overriden")    }}/** *  中介者接口 */protocol Mediator {    /**     发送消息     - parameter message:   消息     - parameter colleague: 发送者     */    func send(message: String, colleague: Colleague)}/// 具体中介者class MessageMediator: Mediator {    private var colleagues: [Colleague] = []    func addColleague(colleague: Colleague) {        colleagues.append(colleague)    }    func send(message: String, colleague: Colleague) {        for c in colleagues {            if c !== colleague { //for simplicity we compare object references                c.receive(message)            }        }    }}/// 具体对象class ConcreteColleague: Colleague {    override func receive(message: String) {        print("Colleague \(name) received: \(message)")    }}let messagesMediator = MessageMediator()let user0 = ConcreteColleague(name: "张三", mediator: messagesMediator)let user1 = ConcreteColleague(name: "李四", mediator: messagesMediator)let user2 = ConcreteColleague(name: "王五", mediator: messagesMediator)messagesMediator.addColleague(user0)messagesMediator.addColleague(user1)messagesMediator.addColleague(user2)user0.send("Hello") // user1 receives message