| [swift] code log, day 5 (0) | 2017.09.27 |
|---|---|
| [swift] code log, day 4 (0) | 2017.09.26 |
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] code log, day 1 (0) | 2017.09.22 |
아래 코드들은 Github 에서도 다운받을 수 있습니다.
SWIFT_Playground_Excersice: https://github.com/youp-han/SWIFT_Playground_Excersice
//------------------------------------------------------------
// 코드 로그 입니다.
// Day 5
do {
let printerResponse = try send(job: 1440, toPrinter: "Gutenberg")
print(printerResponse)
} catch PrinterError.onFire{
print("I'll just put this over here, with the rest of the fire.")
} catch let printerError as PrinterError{
print("Printer error: \(printerError).")
} catch {
print(error)
}
//optional try (try?) will convert result to an optional.
//so if the function throws an error, the error is discarded and
// result is nil
let printerSuccess = try? send(job: 1884, toPrinter: "Mergenthaler")
let printerFailure = try? send(job: 1884, toPrinter: "Never Has Toner")
//defer
var fridgeIsOpen = false
let fridgeContent = ["milk", "eggs", "leftovers"]
func fridgeContains(_ food: String) -> Bool {
fridgeIsOpen = true
defer{
fridgeIsOpen = false
}
let result = fridgeContent.contains(food)
return result
}
fridgeContains("banana")
print(fridgeIsOpen)
//Generics
func makeArray<Item>(repeating item: Item, numberOfTimes: Int) -> [Item]{
var result = [Item]()
for _ in 0..<numberOfTimes {
result.append(item)
}
return result
}
makeArray(repeating: "knock", numberOfTimes: 4)
enum OptionalValue<Wrapped>{
case none
case some(Wrapped)
}
var possibleInteger: OptionalValue<Int> = .none
print("possibleinteger = \(possibleInteger)")
possibleInteger = .some(100)
print("possibleinteger (100) = \(possibleInteger)")
func anyCommonElements<T: Sequence, U: Sequence> (_ lhs: T, _ rhs: U) -> Bool where T.Iterator.Element: Equatable, T.Itertor.Element == U.Iterator.Element{
for lhsItem in lhs{
for rhsItem in rhs{
if lhsItem == rhsItem {
return true
}
}
}
return false
}
anyCommonElements([1,2,3], [3])
| SWIFT vs KOTLIN (0) | 2017.10.31 |
|---|---|
| [swift] code log, day 4 (0) | 2017.09.26 |
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] code log, day 1 (0) | 2017.09.22 |
iBooks 의 SWIFT 4 를 통해 언어 공부 중입니다. 이때 사용된 책 속의 코드 및 연습문제 등의 코드 로그입니다.
아래 코드들은 Github 에서도 다운받을 수 있습니다.
SWIFT_Playground_Excersice: https://github.com/youp-han/SWIFT_Playground_Excersice
//------------------------------------------------------------
// 코드 로그 입니다.
// Day 4
// Enumerationas and Structures
// Default 로 raw value 는 0 에서 시작하지만, 다음의 경우
// case ace = 1에서 시작함.
enum Rank: Int{
case ace = 1
case two, three, four, five, six, seven, eight, nine, ten
case jack, queen, king
func simpleDescription() -> String{
switch self{
case .ace:
return "ace"
case .jack:
return "jack"
case .queen:
return "queen"
case .king:
return "king"
default:
return String(self.rawValue)
}
}
}
let ace = Rank.ace
let aceRawValue = ace.rawValue
let two = Rank.two
let twoRawValue = two.rawValue
if let convertedRank = Rank(rawValue:3) {
let threeDescription = convertedRank.simpleDescription()
print(threeDescription)
}
//enum 2
enum Suit{
case spades, hearts, diamonds, clubs
func simpleDescription()->String{
switch self{
case .spades:
return "spades"
case .hearts:
return "hearts"
case .diamonds:
return "diamonds"
case .clubs:
return "clubs"
}
}
//experiment
func color()->String{
switch self{
case .spades:
return "black"
case .clubs:
return "black"
default:
return "red"
}
}
}
let hearts = Suit.hearts
let heartsDescription = hearts.simpleDescription()
let heartsColor = hearts.color()
// enum 3
enum ServerResponse {
case result (String, String)
case failure (String)
}
let success = ServerResponse.result("6:00 am", "8:09 pm")
let failure = ServerResponse.failure("Out of cheese")
switch success {
case let .result(sunrise, sunset):
print("Sunrise is at\(sunrise) and sunset is at \(sunset).")
case let .failure(message):
print("Failure... \(message)")
}
//struct
// struct vs class
// struct gets copied where classes are passed by reference
struct Card {
var rank: Rank
var suit: Suit
func simpleDescription() -> String {
return "The \(rank.simpleDescription()) of \(suit.simpleDescription())"
}
}
let threeOfSpades = Card(rank: .three, suit: .spades)
let threeOfSpedesDescription = threeOfSpades.simpleDescription()
//Protocals and Estensions
//Classes, enum and Structs can adopt protocols
protocol ExampleProtocol {
var simpleDescription : String { get }
mutating func adjust()
}
class SimpleClass: ExampleProtocol{
var simpleDescription: String = "A very simple class"
var anotherProperty: Int = 52342
func adjust(){
simpleDescription += " Now 100% adjusted"
}
}
var a = SimpleClass()
a.adjust()
let aDescription = a.simpleDescription
struct SimpleStruture: ExampleProtocol {
var simpleDescription: String = "A simple structure"
mutating func adjust(){
simpleDescription += " (adjusted)"
}
}
var b = SimpleStruture()
b.adjust()
let bDescription = b.simpleDescription
// why mutating func in Structure?
// because, the structure is a value type where class is a reference type
// and to make changes in a function of the structure,
// the function should be mutable
// example
struct Rectangle {
var height = 1
var width = 1
func area() -> Int{
return height * width
}
mutating func scaleBy(value: Int) {
width*=value
height*=value
}
}
var rect = Rectangle()
// let rect = Rectangle() will give errors for its a value type (immutable)
rect.area()
rect.scaleBy(value: 3)
rect.area()
// extension of protocol
extension Int: ExampleProtocol {
var simpleDescription: String {
return "the number \(self)"
}
mutating func adjust(){
self += 42
}
}
print (7.simpleDescription)
let protocolValue: ExampleProtocol = a
print(protocolValue.simpleDescription)
//print(protocolValue.anotherProperty)
//Error Handling
enum PrinterError: Error{
case outOfPaper
case noToner
case onFire
}
func send(job: Int, toPrinter printerName: String) throws -> String{
if printerName == "Never Has Toner" {
throw PrinterError.noToner
}
return "Job Sent"
}
do{
// the following statement throws no error
// let printerResponse = try send(job: 1040, toPrinter: "Bi Sheng")
let printerResponse = try send(job: 1040, toPrinter: "Never Has Toner")
print(printerResponse)
}catch{
print(error)
}
| SWIFT vs KOTLIN (0) | 2017.10.31 |
|---|---|
| [swift] code log, day 5 (0) | 2017.09.27 |
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] code log, day 1 (0) | 2017.09.22 |
iBooks 의 SWIFT 4 를 통해 언어 공부 중입니다. 이때 사용된 책 속의 코드 및 연습문제 등의 코드 로그입니다.
아래 코드들은 Github 에서도 다운받을 수 있습니다.
SWIFT_Playground_Excersice: https://github.com/youp-han/SWIFT_Playground_Excersice
//------------------------------------------------------------
// 코드 로그 입니다.
// Day 3
//Objects and Classes
class Shape{
var numberOfSides = 0
func simpleDescription() -> String {
return "A shape with \(numberOfSides) sides."
}
}
var shape = Shape()
shape.numberOfSides = 7
var shapeDescription = shape.simpleDescription();
print(shapeDescription)
//initializer
//when Initializing the class, the init variables must be declared
class NamedShape {
var numberOfSides : Int = 0
var name: String
init(name: String){
self.name = name
}
func simpleDescription() -> String{
return "A Share with\(numberOfSides) sides, and the name is \(name)"
}
}
var testname = NamedShape(name:"Mike")
print(testname.simpleDescription())
//superclass inherritance
class Square: NamedShape{
var sideLength: Double
init(sideLength: Double, name: String){
self.sideLength = sideLength
super.init(name: name)
numberOfSides = 4
}
func area() -> Double {
return sideLength * sideLength
}
override func simpleDescription() -> String {
return "A square with sides of lengh \(sideLength)"
}
}
let test = Square(sideLength: 5.2, name: "my Test Square")
print(test.area())
print(test.numberOfSides)
print(test.simpleDescription())
//excercise : area of Circle
class Circle: NamedShape{
var radius: Double
let pi: Double = 3.141592
init(radius: Double, name: String){
self.radius = radius
super.init(name:name)
numberOfSides = 0
}
func area() -> Double{
return radius * radius * pi
}
override func simpleDescription() -> String {
return "A circle with radius of \(radius)"
}
}
var testCircle = Circle(radius: 4.0, name: "my Test Circle")
print(testCircle.area())
print(testCircle.simpleDescription())
//getter, setter of properties
class EquilateralTriangle: NamedShape{
var sideLength: Double = 0.0
init(sideLength: Double, name: String){
self.sideLength = sideLength
super.init(name: name)
numberOfSides = 3
}
var perimeter: Double{
get{
return 3.0 * sideLength
}
set{
sideLength = newValue / 3.0
}
}
override func simpleDescription() -> String {
return "An equilateral triangle with sides of length\(sideLength)"
}
}
var triagle = EquilateralTriangle(sideLength: 3.1, name: "a Triagle")
print(triagle.perimeter)
triagle.perimeter = 9.9
print(triagle.sideLength)
class TriangleAndSquare{
var triangle:EquilateralTriangle{
willSet{
square.sideLength = newValue.sideLength
}
}
var square: Square{
willSet{
triagle.sideLength = newValue.sideLength
}
}
init(size: Double, name: String){
square = Square(sideLength: size, name: name)
triangle = EquilateralTriangle(sideLength: size, name: name)
}
}
var triangleAndSquare = TriangleAndSquare(size: 10, name: "Another Test Shape")
print(triangleAndSquare.square.sideLength)
print(triangleAndSquare.triangle.sideLength)
triangleAndSquare.square = Square(sideLength: 50, name: "Larger Square")
print(triangleAndSquare.triangle.sideLength)
print(triangleAndSquare.square.sideLength)
let optionalSquare: Square? = Square(sideLength: 2.5, name: "optional Square")
let sideLength = optionalSquare?.sideLength
print("optional sidelength = \(sideLength)")
| [swift] code log, day 5 (0) | 2017.09.27 |
|---|---|
| [swift] code log, day 4 (0) | 2017.09.26 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] code log, day 1 (0) | 2017.09.22 |
| [swift] #SWIFT #4 언어 가이드 (0) | 2017.09.22 |
iBooks 의 SWIFT 4 를 통해 언어 공부 중입니다. 이때 사용된 책 속의 코드 및 연습문제 등의 코드 로그입니다.
아래 코드들은 Github 에서도 다운받을 수 있습니다.
SWIFT_Playground_Excersice: https://github.com/youp-han/SWIFT_Playground_Excersice
//------------------------------------------------------------
// 코드 로그 입니다.
// Day 2
//Function in Function (Closure)
func makeIncrementer() -> ((Int)-> Int) {
func addOne (number: Int) -> Int {
return number + 1
}
return addOne
}
var increment = makeIncrementer()
increment(8)
//a function receives a return value from a function
//as a parameter
// Blocks of codes that call be called later
func hasAnyMatches(list:[Int], condition:(Int)->Bool)->Bool{
for item in list {
if condition(item){
print("conditon true \(item)")
return true
}
print("condition false, and item = \(item)")
}
return false
}
func lessThanTen(number: Int)-> Bool{
return number < 10
}
var numbers = [20, 19, 7, 12]
hasAnyMatches(list: numbers, condition: lessThanTen)
// closure sample with no name
numbers.map({ (number:Int) -> Int in
let result = 3 * number
return result
})
let threeTimes = numbers.map({ (number:Int) -> Int in
let result = 3 * number
return result
})
print(threeTimes)
//experiment : the closure that returns 0 for all odd numbers in list
numbers.map({ (number:Int) -> Int in
let result = number % 2
if result == 0{
return number
}
return 0
})
// when the type of closure is known
let mappedNumbers = numbers.map({ number in 3 * number})
print (mappedNumbers)
// parameters as numbers
let sortedNumbers = numbers.sorted { $0 > $1 }
let sortedNumbers2 = numbers.sorted { $0 < $1 }
print(sortedNumbers)
| [swift] code log, day 4 (0) | 2017.09.26 |
|---|---|
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 1 (0) | 2017.09.22 |
| [swift] #SWIFT #4 언어 가이드 (0) | 2017.09.22 |
| [swift] push notification (0) | 2014.06.25 |
iBooks 의 SWIFT 4를 통해 언어 공부 중입니다. 이때 사용된 책 속의 코드 및 연습문제 등의 코드 로그입니다.
아래 코드들은 Github 에서도 다운받을 수 있습니다.
SWIFT_Playground_Excersice: https://github.com/youp-han/SWIFT_Playground_Excersice
코드 로그 입니다.
//Day 1
//: Playground - noun: a place where people can play
import UIKit
//Simple Values
//decraring variables
var str = "Hello, playground"
let implictInteger = 80
let explicit:Double = 80
let explicit1: Float = 80
let label = "the width is"
let width = 83
let widthLabel = label + String(width)
print("hello world")
let apples = 3
let oranges = 4
let applesSummary = "I have \(8.0) apples"
let fruitSummary = "I have \(8.0 + 10.0) pieces of fruit"
//array and dictionary
var shoppingList = ["catfish", "water", "tulips", "blue paint"]
shoppingList[1] = "bottle of water"
var occupations = [
"Malcolm" : "Captain",
"Kaylee" : "Mechanic",
]
occupations["Jayne"] = "Public Relations"
let emptyArray = [String]()
let emptyDictionary = [String:Float]()
//Control Flow
//for loop & if else
let individualScores = [12, 14, 25, 34, 134]
var teamScore = 0
for score in individualScores {
if score > 30 {
teamScore+=3
} else {
teamScore+=1
}
}
print(teamScore)
//optional variable
var optionalString: String? = "Hello"
print(optionalString == nil)
var optionalName: String? = "John Appleseed"
var greeting = "Hello!"
if let name = optionalName {
greeting = "hello, \(name)"
}
let nickName: String? = nil
let fullName: String = "John Appleseed"
let informalGreeting = "Hi \(nickName ?? fullName)"
//switch
let vegetable = "red pepper"
switch vegetable{
case "celery":
print("wawa")
case "cucumber", "watercress":
print("wwwwww")
case let x where x.hasSuffix("pepper"):
print("wow found red pepper")
default:
print("default")
}
//dictionary
let interestingNumbers = [
"prime":[2,3,5,7,11,13],
"fibonacci":[1,1,2,3,5,8],
"square":[1,4,9,16,25],
]
var largest = 0
for (kind, numbers) in interestingNumbers {
for number in numbers {
if number > largest {
largest = number
}
print(kind + ":" + String(largest))
}
}
print(largest)
//while
var n=2
while n<100 {
n *= 2
}
print(n)
var m = 2
repeat {
m *= 2
} while m < 100
print (m)
// range
var total = 0
// .. vs =< ...
for i in 0..<4 {
total += i
print (total)
}
print (total)
//function and Closure
//function
func greet(person: String, day: String) -> String {
return "Hello \(person), Today is \(day)."
}
greet(person: "Bob", day: "Friday")
func greetWithSpecial(person: String, special: String)->String{
return "Hello \(person), Today's Lunch Special is \(special)."
}
greetWithSpecial(person: "Mike", special: "Meat Balls")
// _ <-- 추가 하여 함수 호출 시 argument label 를 쓰지 않게 한다.
func greet(_ person: String, day: String) -> String {
return "Hello \(person), Today is \(day)."
}
greet("Sam", day: "Saturday")
//tuple , returns multiple results
func calculateStatistics(scores:[Int]) -> (min: Int, max: Int, sum: Int){
var min = scores[0]
var max = scores[0]
var sum = 0
for score in scores {
if score > max {
max = score
} else if score < min {
min = score
}
sum += score
}
return (min, max, sum)
}
let statistics = calculateStatistics(scores: [1,2,3,4,5,6,7,8,9,10])
print(statistics.min)
print(statistics.max)
print(statistics.sum)
print(statistics.0)
print(statistics.1)
print(statistics.2)
func sumOf(numbers: Int...)-> Int {
var sum = 0
for number in numbers {
sum += number
}
return sum
}
sumOf()
sumOf(numbers: 1,2,3,4,5,6,7,8,9,10)
//experiment
func averageOf(numbers: Double...)-> Double{
var average : Double = 0.0
var counter : Double = 0.0
var sum : Double = 0.0
for number in numbers {
sum += number
counter += 1.0
}
if counter != 0.0 {
average = sum / counter
} else {
average = 0.0
}
print("Sum = \(sum)")
print("counter = \(counter)")
return average
}
averageOf()
averageOf(numbers: 1,2,3,4,5,6,7,8,9,10)
func returnFifteen() -> Int{
var y = 10
func add(){
y+=5
}
add()
return y
}
returnFifteen()
| [swift] code log, day 4 (0) | 2017.09.26 |
|---|---|
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] #SWIFT #4 언어 가이드 (0) | 2017.09.22 |
| [swift] push notification (0) | 2014.06.25 |
개인적으로 공부 할 때 사용 중인 가이드 입니다. 링크 공유 합니다.
그리고 다음은 Swift 를 Xcode 에서 Test 하는 화면입니다.
여하튼 업그레이드 된 xCode 9 의 Playground.. 속도도 빠르고, 바로 옆에서 결과물이 보이니 열어놓고 코드 연습 하기 넘 좋습니다.
또한 iBooks 사용하여 SWIFT 3.1 도 언어 익히는데 사용 중입니다.
영문으로 되어 있지만, Playground 에서 결과물이 내용 파악 하는데 쉽도록 많은 도움이 되네요.
요즘 열공 모드 입니다. ㅋㅋ 뒤늦게 이제서야 SWIFT 익히고 있네요 :p
| [swift] code log, day 4 (0) | 2017.09.26 |
|---|---|
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] code log, day 1 (0) | 2017.09.22 |
| [swift] push notification (0) | 2014.06.25 |
swift 로 작성된 push notification 샘플입니다. 꼭 테스트 해 볼 예정임.
sawapi 라는 분이 작성해주셨네요.
테스트 서비스는 php 로 작성되어 있습니다.
https://gist.github.com/sawapi/a7cee65e4ad95578044d
| [swift] code log, day 4 (0) | 2017.09.26 |
|---|---|
| [swift] code log, day 3 (0) | 2017.09.25 |
| [swift] code log, day 2 (0) | 2017.09.24 |
| [swift] code log, day 1 (0) | 2017.09.22 |
| [swift] #SWIFT #4 언어 가이드 (0) | 2017.09.22 |
