Swift中观察者模式观察一个值的变化

概述class Obserber { var name:String? var count:Int = 0 { willSet{ print("Will set an new value \(newValue) to count，current count is \(count)") } didSet{

class Obserber {    var name:String?    var count:Int = 0    {        willSet{            print("Will set an new value \(newValue) to count，current count is \(count)")        }        dIDSet{            print("count changed form \(oldValue) to \(count)")            if count < 10            {                name = "name1"            }else            {                name = "name2"            }        }    }}var ob:Obserber = Obserber()ob.count = 15

输出结果为:

Will set an new value 15 to count，current count is 0

count changed form 0 to 15

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