Swift Tutorial - Tutorialspoint

result: Stmark(mark1: 3.0, mark2: 3.0))

println("student result is: \(set3.average.m1, set3.average.m2)

\(set3.result.mark1, set3.result.mark2)")

When we run the above program using playground, we get the following result:

(0.0,0.0) (0.0,0.0)

(2.0,2.0) 5.0,5.0)

(2.5,2.5) (3.0,3.0)

Rules for Initializer Delegation

Value Types Class Types

Inheritance is not supported for value

types like structures and enumerations.

Referring other initializers is done

through self.init

Inheritance is supported. Checks all stored

property values are initialized

Class Inheritance and Initialization

Class types have two kinds of initializers to check whether defined stored properties
receive an initial value namely designated initializers and convenience initializers.

Designated Initializers and Convenience Initializers

Designated Initializer Convenience Initializer

Considered as primary initializes for a

class

Considered as supporting initialize for a class

All class properties are initialized and

appropriate superclass initializer are

called for further initialization

Designated initializer is called with

convenience initializer to create class instance

for a specific use case or input value type

At least one designated initializer is

defined for every class

No need to have convenience initializers

compulsory defined when the class does not

require initializers.

Init(parameters) { statements } convenience init(parameters) { statements }

Program for Designated Initializers

class mainClass {

var no1 : Int // local storage

init(no1 : Int) {

self.no1 = no1 // initialization