import UIKit
//structure 有default init和memberwise init
/*
struct Faherenheit{
var temperature:Double
init(){
temperature = 32.0
}
}
*/
struct Faherenheit{
var temperature = 32.0;
}
var f = Faherenheit();
f.temperature;
struct Celsius{
var temperatureInCelsius:Double;
init(fromFahrenheit fahrenheit:Double){
temperatureInCelsius = (fahrenheit - 32.0) / 1.8
}
init(fromKelvin kelvin:Double){
temperatureInCelsius = kelvin - 273.15;
}
//使用取消引數名稱的定義
init(_ celsius:Double){
temperatureInCelsius = celsius;
}
}
let boilingPointOfWater = Celsius(fromFahrenheit: 212.0)
print(boilingPointOfWater.temperatureInCelsius);
let freezingPointOfWater = Celsius(fromKelvin: 273.15)
print(freezingPointOfWater.temperatureInCelsius);
struct Color{
let red, green, blue:Double;
init(red:Double, green:Double, blue:Double){
self.red = red
self.green = green
self.blue = blue
}
init(white:Double){
red = white
green = white
blue = white
}
}
let magenta = Color(red: 1.0, green: 0.0, blue: 1.0)
let halfGraf = Color(white: 0.5)
//let veryGreen = Color(0.0, 1.0, 0.0)
let bodyTemperature = Celsius(37.0)
class SurveyQuestion{
let text:String
var response:String?
init(text:String){
self.text = text;
}
func ask(){
print(text)
}
}
let cheeseQuestion = SurveyQuestion(text: "Do you like cheese?")
cheeseQuestion.response = "Yes, I do like cheese."
//default Initializers
class ShoppingListItem{
var name:String?
var quantity = 1
var purchased = false
}
var item = ShoppingListItem();
//struct
struct Size{
var width = 0.0, height = 0.0
}
//memberwise init
let twoByTwo = Size(width: 2.0, height: 2.0)
struct Point{
var x = 0.0, y = 0.0
}
struct Rect{
var origin = Point();
var size = Size();
//呼叫default的init
init(){
}
//自訂的init
init(origin:Point, size:Size){
self.origin = origin
self.size = size
}
init(center:Point, size:Size){
let originX = center.x - (size.width/2)
let originY = center.y - (size.height/2)
self.init(origin: Point.init(x: originX, y: originY), size: size)
}
}
//let basicRect = Rect(origin: Point.init(x: 2.0, y: 2.0), size: Size.init(width: 5.0, height: 5.0))
let originRect = Rect(center: Point.init(x: 2.0, y: 2.0), size: Size.init(width: 5.0, height: 5.0))
originRect.origin.x
originRect.origin.y
originRect.size.width
originRect.size.height
