IOS-Programming

Swift

variables——————————— var month = “april” let day = “10”

string concatenation:

let date = month + day

string interpolation:

let interpolatedAddress = “(country)”

year = 2017 //int

version = 3.0 //float

type safety

let bestPlayer: String = “Micheal Jordan” let year: Int = 22

let hallOfFame: Bool = true

operators——————————— assignment =

== !=

arrays————————————— var todo: [String] = []

//insert todo += [“array concat”] or todo.insert(“watch tv”, at: 2) //doesn’t delete

//remove. shift left todo.remove(at: 2)

//count todo.count

dictionary———————————— /* this is a hash map in swift */

//init

let airportCodes: [String: String] = [“LGA”: “La Guardia”]

//read airportCodes[“LGA”] //reading

//insert airportCodes.updateValue(“SYD”, forKey: “Sydney”)

//remove

airportCodes.removeValues(forKey: “”)

loops———————————

//for each

for task in todo{ print(task) }

//inclusive operator

for number in 1…10{

}

//half open range operator (exclusive)

for number in 1..<10{

}

//while loop

var x = 0 while x <= 20{

}

//do while repeat {

}while

if statements———————————

if temperature < 20{ print(“hi”) }

if !isRaining{

}

Switch Statements————

switch { case value1: do something case value1: do something default: do something else }

really good for ranges

Functions————

func area(length: Int, width: Int) -> Int { let areaOfRoom = length * width return areaOfRoom }

area(length: 10, width: 12)

void

func someFunction() -> (){}

Function Scope————

func arrayModifier(array: [Int]){ var arrayOfInts = array //local arrayOfInts.append(5)

var secondArray = arrayOfInts

}

var arrayOfInts = [1,2,3,4] arrayModifier(array: arrayOfInts)

OOP Structs———— struct Point{ let x: Int let y: Int

init(x: Int, y: Int){
	self.x = x
	self.y = y
}

fun points(inRange range: Int = 1)->[Point]{
	var results = [Point]()
	let lowerBoundOfXRange = x - range

	let upperBoundOfXRange = x+ range

	let lowerBoundOfYRange = y - range

	let upperBoundOfYRange = y + range


	for xCoordinate in lowerboundOfXRange … upperBoundOfXRange{
		for yCoordinate in lowerboundOfYRange … upperBoundOfYRange{
		let coordinatePoint = Point(x: xCoordinate, y: yCoordinate)
		results.append(coordinatePoint)
		}
	}

	return results
}

} let p1 = Point(x: 1, y: 2)

OOP Class————

class Enemy { var life: Int = 2 let position: Point init(x: Int, y: Int){ self.position = Point(x: x, y: y) } func decreaseLife(by factor: Int){ life -= factor } } class Tower{ let position: Point var range: Int = 1 var strength: Int = 1 init(x: Int, y: Int){ self.position = Point(x: x, y: y) } }

omerbaldo/IOS-Programming

IOS-Programming