深入解析Swift语言中的协议

protocol classa {

var marks: Int { get set }
var result: Bool { get }

func attendance() -> String
func markssecured() -> String

}

protocol classb: classa {

var present: Bool { get set }
var subject: String { get set }
var stname: String { get set }

}

class classc: classb {
var marks = 96
let result = true
var present = false
var subject = “Swift Protocols”
var stname = “Protocols”

func attendance() -> String {
return “The (stname) has secured 99% attendance”
}

func markssecured() -> String {
return “(stname) has scored (marks)”
}
}

let studdet = classc()
studdet.stname = “Swift”
studdet.marks = 98
studdet.markssecured()

println(studdet.marks)
println(studdet.result)
println(studdet.present)
println(studdet.subject)
println(studdet.stname)

protocol daysofaweek {
mutating func print()
}

enum days: daysofaweek {
case sun, mon, tue, wed, thurs, fri, sat
mutating func print() {
switch self {
case sun:
self = sun
println(“Sunday”)
case mon:
self = mon
println(“Monday”)
case tue:
self = tue
println(“Tuesday”)
case wed:
self = wed
println(“Wednesday”)
case mon:
self = thurs
println(“Thursday”)
case tue:
self = fri
println(“Friday”)
case sat:
self = sat
println(“Saturday”)
default:
println(“NO Such Day”)
}
}
}

var res = days.wed
res.print()

class SomeClass: SomeProtocol {
required init(someParameter: Int) {
// initializer implementation statements
}
}

protocol tcpprotocol {
init(aprot: Int)
}

class tcpClass: tcpprotocol {
required init(aprot: Int) {
}
}

protocol tcpprotocol {
init(no1: Int)
}

class mainClass {
var no1: Int // local storage
init(no1: Int) {
self.no1 = no1 // initialization
}
}

class subClass: mainClass, tcpprotocol {
var no2: Int
init(no1: Int, no2 : Int) {
self.no2 = no2
super.init(no1:no1)
}
// Requires only one parameter for convenient method
required override convenience init(no1: Int)  {
self.init(no1:no1, no2:0)
}
}
let res = mainClass(no1: 20)
let print = subClass(no1: 30, no2: 50)

println(“res is: (res.no1)”)
println(“res is: (print.no1)”)
println(“res is: (print.no2)”)

protocol Generator {
typealias members
func next() -> members?
}

var items = [10,20,30].generate()
while let x = items.next() {
println(x)
}

for lists in map([1,2,3], {i in i*5}) {
println(lists)
}

println([100,200,300])
println(map([1,2,3], {i in i*10}))

protocol AgeClasificationProtocol {
var age: Int { get }
func agetype() -> String
}

class Person {
let firstname: String
let lastname: String
var age: Int
init(firstname: String, lastname: String) {
self.firstname = firstname
self.lastname = lastname
self.age = 10
}
}

extension Person : AgeClasificationProtocol {
func fullname() -> String {
var c: String
c = firstname + ” ” + lastname
return c
}

func agetype() -> String {
switch age {
case 0…2:
return “Baby”
case 2…12:
return “Child”
case 13…19:
return “Teenager”
case let x where x > 65:
return “Elderly”
default:
return “Normal”
}
}
}

protocol classa {
var no1: Int { get set }
func calc(sum: Int)
}

protocol result {
func print(target: classa)
}

class student2: result {
func print(target: classa) {
target.calc(1)
}
}

class classb: result {
func print(target: classa) {
target.calc(5)
}
}

class student: classa {
var no1: Int = 10

func calc(sum: Int) {
no1 -= sum
println(“Student attempted (sum) times to pass”)

if no1 <= 0 {
println(“Student is absent for exam”)
}
}
}

class Player {
var stmark: result!

init(stmark: result) {
self.stmark = stmark
}

func print(target: classa) {
stmark.print(target)
}
}

var marks = Player(stmark: student2())
var marksec = student()

marks.print(marksec)
marks.print(marksec)
marks.print(marksec)
marks.stmark = classb()
marks.print(marksec)
marks.print(marksec)
marks.print(marksec)

protocol tcpprotocol {
init(no1: Int)
}

class mainClass {
var no1: Int // local storage
init(no1: Int) {
self.no1 = no1 // initialization
}
}

class subClass: mainClass, tcpprotocol {
var no2: Int
init(no1: Int, no2 : Int) {
self.no2 = no2
super.init(no1:no1)
}
// Requires only one parameter for convenient method
required override convenience init(no1: Int)  {
self.init(no1:no1, no2:0)
}
}

let res = mainClass(no1: 20)
let print = subClass(no1: 30, no2: 50)

println(“res is: (res.no1)”)
println(“res is: (print.no1)”)
println(“res is: (print.no2)”)

protocol stname {
var name: String { get }
}

protocol stage {
var age: Int { get }
}

struct Person: stname, stage {
var name: String
var age: Int
}

func print(celebrator: protocol<stname, stage>) {
println(“(celebrator.name) is (celebrator.age) years old”)
}

let studname = Person(name: “Priya”, age: 21)
print(studname)

let stud = Person(name: “Rehan”, age: 29)
print(stud)

let student = Person(name: “Roshan”, age: 19)
print(student)

 import Foundation

@objc protocol rectangle {
var area: Double { get }
}

@objc class Circle: rectangle {
let pi = 3.1415927
var radius: Double
var area: Double { return pi * radius * radius }
init(radius: Double) { self.radius = radius }
}

@objc class result: rectangle {
var area: Double
init(area: Double) { self.area = area }
}

class sides {
var rectsides: Int
init(rectsides: Int) { self.rectsides = rectsides }
}

let objects: [AnyObject] = [Circle(radius: 2.0),result(area: 198),sides(rectsides: 4)]

for object in objects {
if let objectWithArea = object as? rectangle {
println(“Area is (objectWithArea.area)”)
} else {
println(“Rectangle area is not defined”)
}
}