Swift - Custom Type Stored Properties

Introduction

You add stored properties to a class by declaring them just as you would normal variables and constants:


class Point {
     var x = 0.0      //variable
     var y = 0.0      //variable
     let width = 2    //constant
}

Here, the code adds two variables to the Point - x , y and a constant, width of Int type.

In Swift, constants and variables that are stored within a class are known as stored properties.

Like structures, stored properties can have default values.

To access the stored properties of a class, you use dot notation . to access an individual property, as shown here:

Demo

class Point {
     var x = 0.0      //variable
     var y = 0.0      //variable
     let width = 2    //constant
}

var ptA = Point()

//assigning values to properties
ptA.x = 25.0//from  w  w w.ja v  a2 s . co m
ptA.y = 50.0

//retrieving values from properties
print(ptA.x)           //25.0
print(ptA.y)           //50.0
print(ptA.width)       //2

Result

Structures support stored properties.

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