Swift Object-oriented enumeration

Main.swift//Swift Object-oriented enumeration////Created by Goddog on 15/7/17. COPYRIGHT©2015 year Goddog.
All rights reserved. Import Foundation print ("Swift is not only process-oriented, but also object-orientated, Swift can define enumerations, structs, Class 3 object-oriented types, variables defined with enumerations and structs are value types, variables defined by classes are reference types, 3 Object-oriented supports defining storage properties, computed properties, methods, subscripts, constructors, and nested types ") print (" Swift5 Object-oriented program units: classes, structs, enumerations, extensions, Protocols ") print (" Steps for Defining a type: 1. declaring variables; 2. Creating an instance; 3. Access attributes; 4. Calling method; 5. Derived subclasses (enumerations and structs do not support inheritance)//mark:-Define enum enum Season {case Spring case Summer case Fall case Win ter}//or enum Weekday {case Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday}//use enum to declare variable var day:wee KDAY//Using an existing enumeration assignment day = Weekday.saturday print ("Result: \ (day)")//mark:-enumeration value and switch statement var chooseday = weekday.monday Switch C Hooseday {case. Monday:print ("Monday") case. Tuesday:print ("Tuesday") case. Wednesday:print ("Wednesday") case. Thursday:print ("Thursday") case. Friday:print ("Friday") case. Saturday:print ("Saturday") default:print ("Sunday")}//mark: -Original value//define enumeration, specify original value Int enum Weekdays:int {case Monday, Tuesday = 1, Wednessday = 5, Thursday, Friday, Saturday, Sun Nday} var days = Weekdays.monday Print ("Monday are: \ (days.rawvalue)")//0 is automatically determined by tuesday=1 days =. Friday print ("Friday is: \ (days.rawvalue)")//7 is an enum based on wednessday=5 auto-judgment Seasons:character {//Specify the original value for each enumeration CAs E Spring = "s" Case Summer = "U" Case Fall = "F" Case Winter = "W"}//Get enumeration based on original value var Getseason = Seasons (RAWV
    Alue: "s") if Getseason! = nil {switch (getseason!) {case. Spring:print ("Spring") case. Summer:print ("Xia") case. 
    Fall:print ("Autumn") Default:print ("Winter")}}//mark:-associative value enum Planet {//different enumerations can carry an unequal number of associated values of unequal type Case Mercury (weight:double, density:double, name:string) Case Venus (double, double) case Earth (double, Str ing) case Mars (density:double, name:string) Case Jupiter Case Saturn case Uranus case Nepturn} var P1 = Planet.mercurY (weight:0.05, density:5.43, Name: "Mercury") var P2 = Planet.venus (0.815, 5.25) var p3 = Planet.earth (1.0, "Earth") var P4 = Pl Anet. Mars (density:3.95, Name: "Mars") switch (p3) {case Planet.earth (var weight,var name): Print ("\ (name), \ (weigh T) ") default:break} switch (p1) {case-let. Venus (weight, density): Print ("\ (weight), \ (density)") case-let.









 Mercury (Weight:w, Density:d, name:n): Print ("\ (w), \ (d), \ (n)") Default:break}

Swift is not only process oriented or object oriented, Swift can define enumerations, structs, Class 3 object-oriented types, variables defined with enumerations and structs are value types, variables defined by classes are reference types, and 3 object-oriented objects support the definition of storage properties, computed properties, methods, subscripts, Constructors and nested types
SWIFT5 Object-oriented program units: classes, structs, enumerations, extensions, Protocol
definition types steps: 1. Declaring variables, 2. Creating instances, 3. accessing properties; 4. Calling methods; 5. Derived subclasses (enumerations and structs do not support inheritance)
The result: One of Swift's object-oriented objects. Weekday.saturday
Monday
Monday is:0
Friday is:7
spring
earth,  1.0
0.05,  5.43,  Mercury program
ended with exit code:0