Property in Swift

Unlike other programming languages, there are three types properties in Swift.

Stored Properties

They are constants or variables of a class, and part of the class instances that used to store values. One of the examples is the model class.

class Car {
    var name: String
    var price: Float = 0.0
init(name: String, price: Float) {
    self.name = name
    self.price = price
}
}

name and price are stored properties for class Car . We can give stored properties a default value, assign values through initialization and access through .:

let car = Car(name: “Lexus”, price: 1000.0)
car.price = 2000.0

Computed Properties

class Car {
var name: String
var price: Float = 0.0
var minPrice: Float = 1000.0
var maxPrice: Float = 3000.0
var averagePrice: Float {
get {
return (minPrice+maxPrice)/2.0
}

    set {
        self.averagePrice = newValue
    }
}

init(name: String, price: Float) {
    self.name = name
    self.price = price
}
}

Computed properties don’t store the actual value, but provide a getter for the access or setter for set values. If a computed property only provides a getter which is read only.

Static Properties

Static properties are class related not instance so we can access a static property without creating a class instance. This is useful when you want to define a util class

class CarHelper {
static var vendors: [String] = [“Lexus”, “BMW”, “Toyota”]
}

print(Car.vendors)