[IOS] Swift3 Inheritance 개념

import UIKit

//** Inheritance

//** extends개념과 동일

class Car {

    var numWheels = 4

    

    //** 初期化

    init(numWheels: Int) {

        self.numWheels = numWheels

    }

}

//** Like extends

//** Car classのnumWheelsがextends

class FamilyCar: Car {

    var numDoors = 5

}

//** FamilCar classのnumDoorsがextends

//** Car classのnumWheelsがextends

class BigFamilyCar: FamilyCar {

    var size = "Large"

}

//** Object生成

var myFamCar = FamilyCar(numWheels: 6)

myFamCar.numWheels

myFamCar.numDoors

//** extendsしたClassの内に初期化関数(init)のパラメーターがあると入力が必要。

var bigFamCar = BigFamilyCar(numWheels: 2)

bigFamCar.size

[IOS] Swift3 Class - Object 개념

import UIKit

//** Class and Object

class FastCar {

    

    var topSpeed: Int

    

    //** 初期化関数

    init (topSpeed: Int) {

        self.topSpeed = topSpeed

    }

    

    func GetTopSpeed () -> Int {

        //** selfはクラス内の変数を選択する時使用

        return self.topSpeed

    }

    

}

//** Class 宣言

var myCar = FastCar(topSpeed: 210)

myCar.GetTopSpeed()

var ferrari = FastCar(topSpeed: 220)

ferrari.GetTopSpeed()

[IOS] Swift3 Null체크 관련

import UIKit

//** Optionals

//** Null crash at runtime

//** Null check code

var myStr: String?

print(myStr)

//** This is Error

// var newStr = myStr + "suffix"

myStr = "grant"

//** Null Check方法

if let myStrVal = myStr {

    //** myStrがNullの場合、以下のコードは実行しない

    var newStr = myStrVal + "suffix"

}

[IOS] Swift3 Function정의

import UIKit

//** Functions

//** Funtion 定義

func CheckCount () {

    var count: Int = 0

    

    while count < 10 {

        print(count)

        count += 1

    }

}

CheckCount()

//** Function Parameter 定義

func CheckCount (message: String) {

    var count: Int = 0

    

    while count < 10 {

        print(message)

        count += 1

    }

}

CheckCount(message: "not yet")

//** Parameter値を指定

func CheckCount (message: String, pCount: Int) {

    var count: Int = pCount

    

    while count < 10 {

        print(message)

        count += 1

    }

}

CheckCount(message: "not yet2", pCount: 5)

//** Func Return

func CheckCount2 (message: String, pCount: Int) -> String {

    var count: Int = pCount

    

    while count < 10 {

        print(message)

        count += 1

    }

    

    return "Done!"

}

print(CheckCount2(message: "Do yet", pCount: 3))

[IOS] Swift3 for while문

import UIKit

//** Loop

for var i in 0..<10 {

    print(i)

}

/* This is Error(Do not work)

for var i = 0; i < 10; i++ {

    

}

*/

var numbers:[Int] = [4, 75, 2, 5, 3]

for var n in numbers {

    print(n)

}

//** While

var count: Int = 0

//** 基本的なwhile

/*

while count < 10 {

    print(count)

    count += 1

}

*/

//** repeatの場合はDo-whileと同様(repeatを先に実行し、while条件に従って判断する)

repeat {

    print("not yet")

    print(count)

    count += 1

}

while count < 10

[IOS] Swift3 If Else Switch case 조건문

import UIKit

//** If else - Switch Case

//** If Else 条件使用

var myNum = 31

if (myNum == 33) {

    print(myNum)

} else if (myNum > 33) {

    print("old man!")

} else {

    print("Young man!")

}

//** Switch 条件使用

switch myNum {

case 33:

    print(myNum)

case 0..<33:

    print("Switch young!")

default:

    print("old")

}

Switch문에서 각 케이스에 break를 넣어도 에러는 나오지 않음.

[IOS] Swift3 Collection Dictionary

import UIKit

//** Collection

//** Keys - Value

//** Dictionary<Key, Value>

//** Dictionary定義

var namesOfIntegers = [Int: [String]]()

var namesOfIntegers2 = [Int: String]()

//** nameOfInteger[Key] = [Value] Array

namesOfIntegers[1] = ["one", "love"]

namesOfIntegers[2] = ["two", "dvah"]

//** nameOfInteger[Key] = Value

namesOfIntegers2[0] = "Hello"

namesOfIntegers2[1] = "World"

//** Value 出力

print(namesOfIntegers2[0])

print(namesOfIntegers2[1])

//** Array Value 出力

print(namesOfIntegers[2]?[1])

print(namesOfIntegers[1]?[0])

[IOS] Swift3 Set정의

import UIKit

//** Set

var letters = Set<Character>()

letters.insert("a")

//** Arrayと似てる

//** 同一な内容は入らない

var favs: Set<String> = ["pizza", "Wine", "Wine 2", "Wine"]

[IOS]Swift3 Array 정의

import UIKit

//** Array

//** Array 定義

var someInts = [Int] ()

var someStrs = [String] ()

//** Arrayにデータ入力

someInts.append(4)      //** Integerのみ

someStrs.append("gk")   //** Stringのみ

//** Arrayにデータ入力

someInts += [6, 3]

//** Arrayの定義と同時にデータ入力

var someInts2: [Int] = [5, 8, 88, 2334]

someInts2.append(4)

someInts2 += [99, 9]

//** 出力

print(someInts2.count)

print(someStrs.count)

//** Array Index出力(Index指定) - Indexは0から始まる

print(someInts2[2])

[IOS]Swift3 변수 선언

import UIKit

//** 変数定義 (String)

//** var形式

var str = "Hello, playground"

str = "Grant"

//** 変わらない変数

let str2 = "Hello, World"

//** let宣言のものは変更不可

//str2 = "Hi there"

//** Type宣言

//** String 定義

var str3: String = "Hello, String"

//** Int 定義

var myNum: Int = 8

//** Double 定義

var myNum2: Double = 8.383834

//** Float 定義

var myNum3: Float = 8.38392

//** Boolean 定義

var myBooltrue: Bool = true

var myBoolflase: Bool = false