Class And Structrue

struct SomeStructure{

    

}

class SomeClass{

    

}

struct Resolution{

    //在struct內用var定義的稱為property

    var width = 0;

    var height = 0;

}

class VideoMode{

    var resolution = Resolution();

    var interlaced = false;

    var frameRate = 0.0;

    var name:String?;

}

//default初始化Resolution，width = 0，height = 0 

let someResolution = Resolution();

print(someResolution.width);

print(someResolution.height);

let someVideoMode = VideoMode();

someVideoMode.resolution.width = 1280

someVideoMode.resolution.height

let vga = Resolution(width: 640, height: 480)

vga.width;

vga.height;

let hd = Resolution(width: 1920, height: 1080);

var cinema = hd

cinema.width = 2048

hd.width

enum CompassPoiont{

    case north, south, east, west

    mutating func turnNorth(){

        self = .north;

    }

}

var currentDirection = CompassPoiont.west

//rememberedDirection = currentDirection = west

let rememberedDirection = currentDirection

currentDirection.turnNorth();

//rememberedDirection.turnNorth()會出錯！因為rememberedDirection設定為let，值不可改！

print(currentDirection);

print(rememberedDirection);

//referenct

let tenEighty = VideoMode();

tenEighty.resolution = hd;

tenEighty.interlaced = true;

tenEighty.name = "1080i";

tenEighty.frameRate = 25.0;

let alsoTenEighty = tenEighty;

alsoTenEighty.frameRate = 30.0;

print(tenEighty.frameRate);

//識別運算子

//===

//!===

//是不是指向同一個實體

if tenEighty === alsoTenEighty {

    print("遙控同一個實體！");

}