swift观察者模式的实现

来源于麦子学院sunny老师的在线视频
根据老师提示，略做了点扩展，但仍有些小功能没能实现
如：如何把MM jessica今天着装等展现出来，
如何把三个妹子不同的状态展现出来？
通知三个不同小伙不同妹子动向已经实现
以下xcode 6.3 以playground方式编写，实时查看代码演示效果

//: Playground - noun: a place where people can play

import UIKit

class Jessica {

    var hairColor:String = ""
    var diner:String = ""

    init(hairColor:String,diner:String){

        self.hairColor = hairColor
        self.diner = diner
    }

    func show() {
        println("today, Her hairColor is \(hairColor) and diner is \(diner)")


    }

}
protocol SubMike{

}

/** <发布者 */
class Mike:SubMike {
    var status:String = ""
    var boys:[Boy]  = []
    var boys2:NSMutableArray?
    func  attach(newBoy:Boy){

        boys.append(newBoy)
    }
    func  del(badBOY:Boy){
        boys2?.removeObject(Boy)
    }

    func notify() {

        for boy in boys{
            boy.update()
           Jessica(hairColor: "rouge", diner: "bread")
            /***< 没想明白为啥再增加的内容无法演示出来*/
        }
    }

}

/**  <  订阅者*/

class Boy {
    var name:String = ""
    var status:String  = ""
    var mm:String  = ""

    init(name:String,sub:Mike,mm:String){

        self.name = name
        self.status = sub.status
        self.mm = mm
    }

    func update(){
      /**  <  just do it */

        println("\(self.name) 同学, \(self.mm)去 \(self.status) 了")
        Jessica(hairColor: "rouge", diner: "bread")
    }
}

class BoyA:Boy{

    override func update() {
        self.name = name
        self.status = "人民公园看电影"
        println("\(self.name) 同学, \(self.mm)去 \(self.status) 了")
    }
}
class BoyB:Boy{

    override func update() {
        self.name = name
         self.status = "人民公园跑步"
        println("\(self.name) 同学, \(self.mm)去 \(self.status) 了")
    }
}



/** < 当状态发生改变了 */

var mike = Mike()
mike.status  = "人民公园遛狗"  //为何一定要放在前面，放后面就无结果？没想明白


mike.attach(Boy(name: "张元",sub:mike,mm:"jessica"))
Jessica(hairColor: "rouge", diner: "bread")

mike.attach(BoyB(name: "李元",sub:mike,mm:"rebecca"))

mike.attach(BoyA(name: "铜元",sub:mike,mm:"monica"))

mike.notify()