Category: Swift / SwiftUI

//var s: String?
//s = nil

let name: String? = "yamada"
let msg = "hello " + name!

if name != nil {
    let msg = "hello " + name!
}

if let s = name {
 let msg = "hello " + s
}

var label: String!
label = "score"
println(label)

function

//func sayHi(){
//    println("hi")
//}
//sayHi()

func sayHi(name: String){
    println("hi " + name)
}
sayHi("satoshi")

func sayHi(myname name: String){
    println("hi " + name)
}
sayHi(myname: "satoshi")

func sayHi(#name: String = "jiro"){
    println("hi " + name)
}
sayHi(name: "satoshi")

列挙型

enum Result {
    case Success
    case Error
    func getMessage() -> String {
        switch self {
        case .Success:
            return "OK"
        case .Error:
            return "OK"
        }
    }
}

var r: Result

r = Result.Success
r = .Success

Result.Error.rawValue

class

class User {
    var name: String
    var score: Int = 0
    init(name: String){
        self.name = name
    }
    func updrade() {
        score++
    }
}

var tom = User(name: "Tom")
tom.name
tom.score
tom.updrade()
tom.score

継承

class User {
    var name: String
    var score: Int = 0
    init(name: String){
        self.name = name
    }
    final func upgrade() {
        score++
    }
}

class AdminUser: User {
    func reset(){
        score = 0
    }
    override func upgrade(){
        score += 3
    }
}

protocol

protocol Student {
    var studentId: String { get set }
    func study()
}

class User: Student {
    var name: String
    var score: Int = 0
    var studentId: String = "hoge"
    func study(){
        println("studying.....")
    }
    init(name: String){
        self.name = name
    }
    func upgrade() {
        score++
    }
}



var tom = User(name: "Tom")
tom.name
tom.score
tom.upgrade()
tom.score

willSet, didSet

class User {
    var name: String
    var score: Int = 0 {
        willSet{
            println("\(score) -> \(newValue)")
        }
        didSet {
            println("\(oldValue) -> \(score)")
        }
    }
    var level: Int {
        get{
            return Int(score / 10)
        }
        set {
            score = Int(newValue * 10)
        }
    }
    init(name: String){
         self.name = name
        }
    func upgrade() {
        score++
    }
}

optional chaining

class User {
    var blog: Blog?
}

class Blog {
    var title = "My Blog"
}

var tom = User()
tom.blog = Blog()
tom.blog?.title

if let t = tom.blog?.title {
    println(t)
}

type casting

class User {
    var name: String
    init(name: String){
        self.name = name
    }
}
class AdminUser: User {}

let tom = User(name: "Tom")
let bob = AdminUser(name: "Bob")
let steve = someUser()

let users: [AnyObject] = [tom, bob, steve]

for user in users {
    if let u = user as? AdminUser {
        println(u.name)

構造体

struct UserStruct {
    var name: String
    var score: Int = 0
    init(name: String){
        self.name = name
    }
    mutating func upgrade(){
        score++
    }
}

拡張

extension String {
    var size: Int {
        return countElements(self)
    }
    func dummy() -> String {
        return "dummy"
    }
}

var s: String = "hoge"
s.size
s.dummy()

generics

func getArray(item: T, count: Int) -> [T]
{
    var result = [T]()
    for _ in 0..
	

X-codeのplaygroundでコードと実行結果を表示します。

//print("hello world")
print("hello world")

変数

//var msg: String
//msg = "hello world"
//変更ができない変数 let

//var msg = "hello world"

var msg = "hello"
let s = "hoge"
//s = "bar"
println("msg: \(msg), s: \(s)")

データ型

// String, Int, Float/Double, Bool, nil
// + - * / %
let x: Float = 8.0 % 2.5
var y = 0
y++
y

let s = "hello " + "world"
true && true
true || false
!true

let a = "hkt"
let b = 48
let c = a + String(b)

タプル: _xxx はxxxを破棄

//let error = (40, "not found")
//error.0
//error.1

let error = (code:40, msg:"not found")
error.code
error.msg

let error = (40, "not found")
//let (code, msg) = error
let (code, _msg) = error
code
msg

swift

var colors: [String] = ["blue", "pink"]
colors[0]
colors[1] = "red"
colors

colors.count
colors.isEmpty

colors.append("green")
colors.insert("gray", atIndex: 1)

let secondColor = colors.removeAtIndex(1)

dictionary

var users: [String: Int] = [
  "yamada": 500,
    "tanaka" : 800
]

users["yamada"]

users.count
users.isEmpty

users["ito"] = 900
users

users.removeValueForKey("ito")
users

users.updateValue(1000, forKey: "tanaka")
let keys = Array(users.keys)
let values = Array(users.values)

var emptyDictionary = [String: Int]()

if

let score = 72
var result = ""

if score > 80 {
    result = "Great"
} else if score > 60 {
   result = "good"
} else {
    result = "soso..."
}

result = score > 80 ? "great" : "so so..."

switch

let num = 7

switch num {
case 0:
    println("zero")
case 1, 2, 3:
    println("small")
case 4...6:
    println("4/5/6")
case 7..<9:
    println("7/8")
case let n where n > 10:
    println("huge")
default:
    println("n.a.")
}

while

var n = 0
//while n < 10 { // println(n) // n++ //} do { println(n) n++ } while n < 10 [/code] for

for var i = 0; i < 10; i++ {
 println(i)
}

for i in 0...9 {
    println(i)
}

let a = [5, 3, 10]
for i in a {
    println(i)
}

developer向けサイト:https://developer.apple.com
developerプログラム:https://developer.apple.com/programs/jp/

ctrl で、support editorにひも付けて、変数myLableにchnageLabelしています。

    @IBOutlet weak var myLabel: UILabel!

    @IBAction func changeLabel(sender: AnyObject) {
        myLabel.text = "You changed me"
    }

tips
command + 0 ->navigator area削除
auto size, auto layout on
story board -> assistant editor -> preview
upgrade frames ->制約に自動調整, items new constrainsで作成時につけることも可能
clear constrains ->制約を解除

上下左右幅いっぱいにするには　margin 0

constrain: Editor -> pin -> height or width
view ctrl + dragでも可能
viewを2つ選択して equal height
multiplier: 2つのviewの比率を設定

labelなどのtextはxcode側でサイズを自動計算するので、必ずしも指定しなくてOK
content Hugging priority 大きくなりにくさ

deviceごとに表示を変えるには、画面下のsize classで設定