// 这是一个注释

//
//  ObjcFunc.h
//

# import <Foundation/Foundation.h>

@interface ObjcFunc : NSObject

-(NSString*)sayHello:(NSString*)greeting withName: (NSString*)name;

@end

//
//  ObjcFunc.m
//

# import "ObjcFunc.h"

# import "CombinedProgram-Swift.h"

@implementation ObjcFunc

- (NSString*)sayHello:(NSString*)greeting withName: (NSString*)name{

    NSString *string = [NSString stringWithFormat:@"Hi,%@ %@.",name,greeting];

    return string;

  }

@end

SwiftFunc* obj = [[SwiftFunc alloc] init];
[obj sayHello];

if 1+1 == 2 {
         println("The math checks out")
}

var conditionalString : String? = "a string"
     if let theString = conditionalString? {
         println("The string is '\(theString)'")
     } else {
         println("The string is nil")
}
// 输出 "The string is 'a string'"

let loopingArray = [1,2,3,4,5]
var loopSum = 0
for number in loopingArray {
     loopSum += number
}
loopSum // = 15


var firstCounter = 0
     for index in 1 ..< 10 {
         firstCounter++
     }
// 循环9次

var secondCounter = 0
for index in 1 ... 10 { // 注意是三个句点,不是两个
         secondCounter++
     }
// 循环10次

var sum = 0
for var i = 0; i < 3; i++ {
    sum += 1
}
sum // = 3

var countDown = 5
while countDown > 0 {
     countDown--
}
countDown // = 0

var countUP = 0
do {
         countUp++
} while countUp < 5
countUp // = 5

func sayHello(personName: String) -> String {
  let greeting = "Hello, " + personName + "!"
  return greeting
}

println(sayHello("Anna"))
// prints "Hello, Anna!"
println(sayHello("Brian"))
// prints "Hello, Brian!"

func sayGoodbye(personName: String) {
	println("Goodbye, \(personName)!")
}
sayGoodbye("Dave") // prints "Goodbye, Dave!"

func thirdFunction(firstValue: Int, secondValue: Int) -> Int {
         return firstValue + secondValue
     }
thirdFunction(1, 2)

func count(string: String) -> (vowels: Int, consonants: Int, others: Int) {
        var vowels = 0, consonants = 0, others = 0
        for character in string {
            switch String(character).lowercaseString {
            case "a", "e", "i", "o", "u":
                ++vowels
            case "b", "c", "d", "f", "g", "h", "j", "k", "l", "m",
            "n", "p", "q", "r", "s", "t", "v", "w", "x", "y", "z":
            ++consonants
            default:
            ++others
            }
        }
        return (vowels, consonants, others)
    }

func fourthFunction(firstValue: Int, secondValue: Int)
         -> (doubled: Int, quadrupled: Int) {
         return (firstValue * 2, secondValue * 4)
     }
fourthFunction(2, 4)

// 用数字访问:
fourthFunction(2, 4).1 // = 16

// 其他相同,只是使用了名字:
fourthFunction(2, 4).quadrupled // = 16

    func someFunction(parameterName: Int) {
        // function body goes here, and can use parameterName
        // to refer to the argument value for that parameter
    }

func someFunction(externalParameterName localParameterName: Int) {
        // function body goes here, and can use localParameterName
        // to refer to the argument value for that parameter
    }

    func join(string s1: String, toString s2: String, withJoiner joiner: String)
        -> String {
        return s1 + joiner + s2
    }
    join(string: "hello", toString: "world", withJoiner: ", ")
    // returns "hello, world"

func containsCharacter(#string: String, #characterToFind: Character) -> Bool {
    for character in string {
        if character == characterToFind {
            return true
        }
    }
    return false
}

let containsAVee = containsCharacter(string: "aardvark", characterToFind: "v")
// containsAVee equals true, because "aardvark" contains a "v"

func join(string s1: String, toString s2: String,
    withJoiner joiner: String = " ") -> String {
        return s1 + joiner + s2
}

    join(string: "hello", toString: "world", withJoiner: "-")
    // returns "hello-world"

    join(string: "hello", toString: "world")
    // returns "hello world"

    func arithmeticMean(numbers: Double...) -> Double {
        var total: Double = 0
        for number in numbers {
            total += number
        }
        return total / Double(numbers.count)
    }
    arithmeticMean(1, 2, 3, 4, 5)
    // returns 3.0, which is the arithmetic mean of these five numbers
    arithmeticMean(3, 8, 19)
    // returns 10.0, which is the arithmetic mean of these three numbers

    func alignRight(var string: String, count: Int, pad: Character) -> String {
        let amountToPad = count - countElements(string)
        for _ in 1...amountToPad {
            string = pad + string
        }
        return string
    }
    let originalString = "hello"
    let paddedString = alignRight(originalString, 10, "-")
    // paddedString is equal to "-----hello"
    // originalString is still equal to "hello"

    func swapTwoInts(inout a: Int, inout b: Int) {
        let temporaryA = a
        a = b
        b = temporaryA
    }

    var someInt = 3
    var anotherInt = 107
    swapTwoInts(&someInt, &anotherInt)
    println("someInt is now \(someInt), and anotherInt is now \(anotherInt)")
    // prints "someInt is now 107, and anotherInt is now 3"

    reversed = sort(names, { (s1: String, s2: String) -> Bool in
        return s1 > s2
    })

	reversed = sort(names, { s1, s2 in return s1 > s2 } )

    reversed = sort(names, { s1, s2 in s1 > s2 } )

	reversed = sort(names, { $0 > $1 } )

    func someFunctionThatTakesAClosure(closure: () -> ()) {
        // 函数体部分
    }

    // 以下是不使用 trailing 闭包进行函数调用

    someFunctionThatTakesAClosure({
        // 闭包主体部分
    })

    // 以下是使用 trailing 闭包进行函数调用

    someFunctionThatTakesAClosure() {
        // 闭包主体部分
    }

    func makeIncrementor(forIncrement amount: Int) -> () -> Int {
        var runningTotal = 0
        func incrementor() -> Int {
            runningTotal += amount
            return runningTotal
        }
        return incrementor
    }

incrementByTen() // 返回的值为10
incrementByTen() // 返回的值为20
incrementByTen() // 返回的值为30

let incrementBySeven = makeIncrementor(forIncrement: 7)
incrementBySeven() // 返回的值为7
incrementByTen() // 返回的值为40

class Vehicle {
    var color: String?
    var maxSpeed = 80
    func description() -> String {
        return "A \(self.color) vehicle"
    }
    func travel() {
        print("Traveling at \(maxSpeed) kph")
    }
}

var redVehicle = Vehicle()
redVehicle.color = "Red"
redVehicle.maxSpeed = 90
redVehicle.travel() // 输出"Traveling at 90 kph" redVehicle.description() // = "A Red vehicle"

class InitAndDeinitExample {
    // 指定的初始化器(也就是主初始化器)
    init() {
        print("I've been created!")
    }
    // 便捷初始化器,是调用上述指定初始化器所必需的
    convenience init (text: String) {
        self.init() // 这是必需的
        print("I was called with the convenience initializer!")
    }
    // 反初始化器
    deinit {
        print("I'm going away!")
    }
}

var example : InitAndDeinitExample?
// 使用指定的初始化器
example = InitAndDeinitExample() // 输出"I've been created!"
example = nil // 输出"I'm going away"
// 使用便捷初始化器
example = InitAndDeinitExample(text: "Hello")
// 输出"I've been created!"
// 然后输出"I was called with the convenience initializer"

import UIKit

class DataCenter: NSObject {
    let dataCenterObj:DataCenter = DataCenter()
    func getDataCenter() ->DataCenter {
        return dataCenterObj
    }
}

class Vector2D {
    var x : Float = 0.0
    var y : Float = 0.0
    init (x : Float, y: Float) {
        self.x = x
        self.y = y
    }

}
func +(left : Vector2D, right: Vector2D) -> Vector2D {
    let result = Vector2D(x: left.x + right.x, y: left.y + right.y)
    return result
}

let first = Vector2D(x: 2, y: 2)
let second = Vector2D(x: 4, y: 1)
let result = first + second

class Car: Vehicle {
	// 继承类可以重写函数
  override func description() -> String {
  	var description = super.description()
  	return description + ", which is a car"
} }

override func description() -> String {
         var description = super.description()
         return description + ", which is a car"
}

//基本使用
let maximumNumberOfLoginAttempts = 10
var currentLoginAttempt = 0

//定义变量
var myVariable = 123

//定义常量
let myConstantVariable = 123

// 隐式指定整数类型
var anInteger = 2

// 明确指定整数类型
let anExplicitInteger :Int = 2

var x = 0.0, y = 0.0, z = 0.0

var stringValue : String
//error: variable 'stringValue' used before being initialized
//let hashValue = stringValue.hashValue
let hashValue = stringValue.hashValue

enum Optional<T> : LogicValue, Reflectable {
    case None
    case Some(T)
    init()
    init(_ some: T)

    /// Allow use in a Boolean context.
    func getLogicValue() -> Bool

    /// Haskell's fmap, which was mis-named
    func map<U>(f: (T) -> U) -> U?
    func getMirror() -> Mirror
}

let hashValue = strValue!.hashValue

myLabel!.text = "text"
myLabel!.frame = CGRectMake(0, 0, 10, 10)
...

let minValue = UInt8.min  // minValue 为 0，是 UInt8 类型的最小值 let maxValue = UInt8.max  // maxValue 为 255，是 UInt8 类型的最大值

    if turnipsAreDelicious {
        println("Mmm, tasty turnips!")
    } else {
        println("Eww, turnips are horrible.")
    }
    // 输出 "Eww, turnips are horrible."

import UIKit

let date = NSDate();
// "Apr 1, 2015, 8:53 AM" <-- local without seconds

var formatter = NSDateFormatter();
formatter.dateFormat = "yyyy-MM-dd HH:mm:ss ZZZ";
let defaultTimeZoneStr = formatter.stringFromDate(date);
// "2015-04-01 08:52:00 -0400" <-- same date, local, but with seconds
formatter.timeZone = NSTimeZone(abbreviation: "UTC");
let utcTimeZoneStr = formatter.stringFromDate(date);
// "2015-04-01 12:52:00 +0000" <-- same date, now in UTC

// Date comparision to compare current date and end date.
var dateComparisionResult:NSComparisonResult = NSDate().compare(endDate)

if dateComparisionResult == NSComparisonResult.OrderedAscending
{
    // Current date is smaller than end date.
}
else if dateComparisionResult == NSComparisonResult.OrderedDescending
{
    // Current date is greater than end date.
}
else if dateComparisionResult == NSComparisonResult.OrderedSame
{
    // Current date and end date are same.
}

extension NSDate {
    convenience init?(jsonDate: String) {
        let prefix = "/Date("
        let suffix = ")/"
        let scanner = NSScanner(string: jsonDate)

        // Check prefix:
        if scanner.scanString(prefix, intoString: nil) {

            // Read milliseconds part:
            var milliseconds : Int64 = 0
            if scanner.scanLongLong(&milliseconds) {
                // Milliseconds to seconds:
                var timeStamp = NSTimeInterval(milliseconds)/1000.0

                // Read optional timezone part:
                var timeZoneOffset : Int = 0
                if scanner.scanInteger(&timeZoneOffset) {
                    let hours = timeZoneOffset / 100
                    let minutes = timeZoneOffset % 100
                    // Adjust timestamp according to timezone:
                    timeStamp += NSTimeInterval(3600 * hours + 60 * minutes)
                }

                // Check suffix:
                if scanner.scanString(suffix, intoString: nil) {
                    // Success! Create NSDate and return.
                    self.init(timeIntervalSince1970: timeStamp)
                    return
                }
            }
        }

        // Wrong format, return nil. (The compiler requires us to
        // do an initialization first.)
        self.init(timeIntervalSince1970: 0)
        return nil
    }
}

if let theDate = NSDate(jsonDate: "/Date(1427909016000-0800)/")
{
    println(theDate)
}
else
{
    println("wrong format")
}

var dataString = "April 1, 2015" as String
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "MM-dd-yyyy"
dateFormatter.timeZone = NSTimeZone.localTimeZone()

// convert string into date
let dateValue = dateFormatter.dateFromString(dataString) as NSDate!

println(dateValue)

// Playground - noun: a place where people can play

import UIKit

// Setup the calendar object
let calendar = NSCalendar.currentCalendar()

// Set up date object
let date = NSDate()

// Create an NSDate for the first and last day of the month
//let components = calendar.components(NSCalendarUnit.CalendarUnitYear |
//                                     NSCalendarUnit.CalendarUnitMonth |
//                                     NSCalendarUnit.WeekdayCalendarUnit |
//                                     NSCalendarUnit.WeekCalendarUnit |
//                                     NSCalendarUnit.CalendarUnitDay,
//                                     fromDate: date)

// Create an NSDate for the first and last day of the month
let components = NSCalendar.currentCalendar().components(NSCalendarUnit.CalendarUnitMonth, fromDate: date)


components.month

// Getting the First and Last date of the month
components.day = 1
let firstDateOfMonth: NSDate = calendar.dateFromComponents(components)!

components.month  += 1
components.day     = 0
let lastDateOfMonth: NSDate = calendar.dateFromComponents(components)!

var unitFlags = NSCalendarUnit.WeekOfMonthCalendarUnit |
                NSCalendarUnit.WeekdayCalendarUnit     |
                NSCalendarUnit.CalendarUnitDay

let firstDateComponents = calendar.components(unitFlags, fromDate: firstDateOfMonth)
let lastDateComponents  = calendar.components(unitFlags, fromDate: lastDateOfMonth)

// Sun = 1, Sat = 7
let firstWeek = firstDateComponents.weekOfMonth
let lastWeek  = lastDateComponents.weekOfMonth

let numOfDatesToPrepend = firstDateComponents.weekday - 1
let numOfDatesToAppend  = 7 - lastDateComponents.weekday + (6 - lastDateComponents.weekOfMonth) * 7

let startDate: NSDate = calendar.dateByAddingUnit(NSCalendarUnit.CalendarUnitDay, value: -numOfDatesToPrepend, toDate: firstDateOfMonth, options: nil)!
let endDate:   NSDate = calendar.dateByAddingUnit(NSCalendarUnit.CalendarUnitDay, value: numOfDatesToAppend, toDate: lastDateOfMonth, options: nil)!

Array(map(0..<42) {
    calendar.dateByAddingUnit(NSCalendarUnit.CalendarUnitDay, value: $0, toDate: startDate, options: nil)!
})

"\(components.year)"


var dateString = "2014-10-3" // change to your date format
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "YYYY-MM-dd"

var someDate = dateFormatter.dateFromString(dateString)
println(someDate)

  let string1 : String = "Hello"
     let string2 : String = "Hel" + "lo"
     if string1 == string2 {
         println("The strings are equal")
  }

println("The current value of friendlyWelcome is \(friendlyWelcome)")
// 输出 "The current value of friendlyWelcome is Bonjour!

let stringToConvert = "Hello, Swift"
let data = stringToConvert.dataUsingEncoding(NSUTF8StringEncoding)

let http404Error = (404, "Not Found")
// http404Error 的类型是 (Int, String)，值是 (404, "Not Found")

let (justTheStatusCode, _) = http404Error
println("The status code is \(justTheStatusCode)")
// 输出 "The status code is 404"

println("The status code is \(http200Status.statusCode)")
// 输出 "The status code is 200"
println("The status message is \(http200Status.description)")
// 输出 "The status message is OK"