OOP with Swift examples

Abstraction.playground

import Foundation

class Vehicle {
    var model: String
    var make: Int
    
    init(model: String, make: Int) {
        self.model = model
        self.make = make
    }
    
    func start() { print("Vehicle - Start") }
    func stop() { print("Vehicle - Stop") }
}

let сuriosity = Vehicle(model: "Rover", make: 2011)

Encapsulation.playground

import Foundation

class Vehicle {
    var model: String
    var make: Int
    
    init(model: String, make: Int) {
        self.model = model
        self.make = make
    }
    
    func start() { print("Vehicle - Start") }
    func stop() { print("Vehicle - Stop") }
}
let сuriosity = Vehicle(model: "Rover", make: 2011)

class Car: Vehicle {
    var tireCount: Int
    private var isEngineWorks = false
    
    init(model: String, make: Int, tireCount: Int = 4) {
        self.tireCount = tireCount
        super.init(model: model, make: make)
    }
    
    override func start() {
        print("Car - Start")
    }
    override func stop() {
        super.stop()
    }
    
    private func startEngine() {
        isEngineWorks = true
    }
    
    private func stopEngine() {
        isEngineWorks = false
    }
}

let ford = Car(model: "Ford focus", make: 2018)

Inheritance.playground

import Foundation

class Vehicle {
    var model: String
    var make: Int
    
    init(model: String, make: Int) {
        self.model = model
        self.make = make
    }
    
    func start() { print("Vehicle - Start") }
    func stop() { print("Vehicle - Stop") }
}
let сuriosity = Vehicle(model: "Rover", make: 2011)

class Car: Vehicle {
    var tireCount: Int
    
    init(model: String, make: Int, tireCount: Int = 4) {
        self.tireCount = tireCount
        super.init(model: model, make: make)
    }
    
    override func start() {
        print("Car - Start")
    }
    override func stop() {
        super.stop()
    }
}

let ford = Car(model: "Ford focus", make: 2018)

Polymorphism.playground

import Foundation

class Vehicle {
    var model: String
    var make: Int
    
    init(model: String, make: Int) {
        self.model = model
        self.make = make
    }
    
    func start() { print("Vehicle - Start") }
    func stop() { print("Vehicle - Stop") }
}


class Car: Vehicle {
    var tireCount: Int
    private var isEngineWorks = false {
        didSet {
            print("Engine working: \(isEngineWorks)")
        }
    }
    
    init(model: String, make: Int, tireCount: Int = 4) {
        self.tireCount = tireCount
        super.init(model: model, make: make)
    }
    
    override func start() {
        startEngine()
        print("Car - Start")
    }
    override func stop() {
        super.stop()
        stopEngine()
    }
    
    private func startEngine() {
        isEngineWorks = true
    }
    
    private func stopEngine() {
        isEngineWorks = false
    }
}

class Bike: Vehicle {
    func getInforation() -> String {
        return "Bike model: \(model) maked: \(make)"
    }
}

let сuriosity = Vehicle(model: "Rover", make: 2011)
let bike = Bike(model: "Pinarello", make: 2019)
let ford = Car(model: "Ford focus", make: 2018)

let vechicles = [сuriosity, bike, ford]

vechicles.forEach { vechicle in
    print("Class: \(String(describing: vechicle)) model: \(vechicle.model)")
    vechicle.start()
    vechicle.stop()
    print("\n")
}