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  • 构造器及属性监视器

    //默认构造器
    class Student{
        var name : String = ""
        var number : Int = 0
    }
    //自定义构造函数
    class Person{
        //雷属性
        var name:String
        var age:Int
        //类构造函数
        init(newName:String,newAge:Int) {
            self.name = newName
            self.age = newAge
        }
        //实例函数
        func say() -> String {
            return "我叫MT(name)"
        }
    }
    class People {
        //普通属性
        var firstName:String = ""
        var lastName:String = ""
        var nickName:String = ""
        
        //计算属性
        var fullName:String {
            get {
                return nickName + " " + firstName + " " + lastName
            }
        }
        //带属性监视器普通属性
        var age:Int = 0 {
            //属性变化前
            willSet{
                print("will set an new value(age) to age")
            }
            didSet{
                print("age file change form (oldValue) to (age)")
                if age < 10 {
                    nickName = "Little"
                }else{
                    nickName = "Big"
                }
            }
        }
        func toString() ->String{
            return "Full name (fullName) +_ age(age)"
        }
    }
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  • 原文地址:https://www.cnblogs.com/edensyd/p/9429952.html
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