Swift

Swift is a powerful and intuitive open-source programming language developed by Apple Inc. for building applications across Apple’s ecosystem, including iOS, macOS, watchOS, and tvOS. It is also increasingly used for server-side development and other platforms due to its performance and modern features.

https://www.swift.org

Book and Course Links

• https://store.kodeco.com
• https://objcio.gumroad.com
• https://donnywals.gumroad.com
• https://twostraws.gumroad.com
• https://seanallen.teachable.com

Channel Links

• https://www.youtube.com/@seanallen
• https://www.youtube.com/@twostraws
• https://www.youtube.com/@SwiftfulThinking
  

High Level Language Review

Xcode vs. Swift Playgrounds

Swift Basics

Swift Basic Types

Swift Variables and Constants

Class vs. Struct

Class has inheritance which means you can create a subclass that inherits properties from the initial class.

Swift Code Examples

Hello World:

print("Hello, world!")

Swift Basics ( Reference: https://www.youtube.com/@SwiftfulThinking )

import Foundation

var greeting = "Hello, playground"

print(greeting)

// Single line comment

/*
 Line 1
 Line 2
 Line 3
 Multiple line comment
 */

/*
Naming Conventions
Variable and Constant names in camel case

 Correct
 Camel Case Example: theFirstDayOfTheWeek
 
 Not Correct
 Pascal Case Example: TheFirstDayOfTheWeek
 Snake Case Example: the_first_day_of_the_week
 */

Swift Basic Types( Reference: https://www.youtube.com/@SwiftfulThinking )

import UIKit

// "String"
let exampleOne = "Hello, playground"

// Boolean true or false
let exampleTwo = true

// Date
let exampleThree = Date()

// Numbers Int, Double, CGFloat

// Int
let exampleFour: Int = 42

// Double
let exampleFive: Double = 3.14

// CGFloat - often used is UI xy design
let exampleSix: CGFloat = 100.0

Variables and Constants:

var greeting = "Hello" // Declares a variable
let name = "Alice"     // Declares a constant

greeting = "Hi" // Variables can be changed
// name = "Bob" 
// Constants cannot be changed (this would cause an error)

Functions:

func greet(person: String) {    
    print("Hello, \(person)!")
}

greet(person: "Bob") // Calling the function

Control Flow (If/Else):

let temperature = 25

if temperature > 30 {
    print("It's hot!")
} else if temperature < 10 {
    print("It's cold!")} else {
    print("The weather is pleasant.")
}

Arrays:

var fruits = ["Apple", "Banana", "Cherry"]
print(fruits[0]) // Accessing elements by index 
//(output: Apple)

fruits.append("Date") // Adding an element
print(fruits) 
// output: ["Apple", "Banana", "Cherry", "Date"]

Loops (For-in):

for fruit in fruits {
    print("I like \(fruit).")
}

Structures:

struct Book {
    var title: String
    var author: String
    var year: Int
}

let myBook = Book(title: "The Great Gatsby", author: "F. Scott Fitzgerald", year: 1925)

print(myBook.title) // output: The Great Gatsby

Class:

class = myCar {
    var = year: Int
    var = color: String

    init (year: Int, color: String){
        self.year = year
        self.color = color
     }
}

Operators