Swift 2.0 Learning Notes (Day 42)-constructor call rules

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You can use the constructor proxy in a constructor to help complete some of the construction work. Class constructor proxies are divided into horizontal and upward proxies, which can only occur inside the same class, and this constructor is called a convenience constructor. An up-agent occurs in the case of inheritance, in which the parent class constructor is called to initialize the stored property of the parent class, which is called the specified constructor, during the child class construction.  

Constructor Call rules

Person and Student Class Example: class Person {    var name:string    var age:int        func description (), String {        return " \ (name) is: \ (age) "    }    Convenience init () {         //facilitation Constructor        Self.init (name:" Tony ")        self.age =    }< C10/>convenience Init (name:string) {//Facilitation constructor        Self.init (Name:name, age:18)    }    init (name:string, age:i NT) {       //Specify constructor        self.name = name        Self.age = Age    }} class Student:person {    var school: String    Init (name:string, Age:int, school:string) {       //Specify constructor        Self.school = School        super.init (  Name:name, Age:age)    }    convenience override init (name:string, Age:int) {//Facilitation constructor        Self.init (Name:name, Age:age, School: "Tsinghua University")    

Calls between constructors form a chain of constructor functions.

S Wift 3

person

•  

• convenience constructors must call other constructors defined in the same class 。 person

• person

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Swift 2.0 Learning Notes (Day 42)-constructor call rules