Swift Dictionary and array

1, dictionary-Dictionary (that is, key-value pairs)

var empty = [String:int] ()//  Create an empty dictionary var mydic = ["Name": "Hangge",    "url": "hangge.com"]  //Declare a dictionary mydic[" Address "] =" China "//Add or modify key value Mydic.removevalueforkey (" name ")  //delete" name "This key value mydic[" name "] = Nil  //can also be deleted "Name" This key value Mydic.keys  //Access Dictionary key collection Mydic.values//Access Dictionary values collection//Traverse dictionary for (key,value) in Mydic {    print ("\ ( Key): \ (value) ");} Only the key of the dictionary is traversed (key) for key in Mydic.keys {    print ("\ (key)");}//Only the value of the dictionary is traversed (value) for value in Mydic.values {    print ("\ ( Value) ");

2, arrays- array

var types = ["None", "Warning", "error"]  //Omit type array declaration         var menbers = [String] ()//Declare an empty array         menbers.append ("Six ")  //add element Menbers + = [" seven "]//Add element Menbers.insert (" one ", atindex:0)  //Specify location add Element         Menbers[0] =" message " /  /Modify the data in the array by subscript menbers[0...2] = ["Message", "Hangge", "com"]  //Replace the data by a small standard interval (first 3 data)         Menbers.count  / /Gets the number of array elements menbers.isempty  //Determine if the array is empty         menbers.removeatindex (2)  //Delete the array labeled 2 menbers.removelast ()  //Delete last element Menbers.removeall (keepcapacity:true)  //Delete all elements in array let         Addstringarr = types + menbers//array combination         //Use the for in to implement an array traversal for the value in menbers{    print ("\ (value)");}         All indexes of the array are traversed at the same time through the enumerate function with data for (Index,value) in Menbers.enumerate () {    print ("Index: \ (index) data: \ (value)");}

3, struct-struct

Create a struct struct bookinfo{    var id:int = 0    var name:string = "Defaut"    var author:string = "Defaut"} var Book1:bo Okinfo//default constructor Create struct instance var book2 = BookInfo (id:0021,name: "Aerial Song", Author: "Hangge")  //Call the constructor to create an instance book2.id = 1234  // modifying internal values

4, enum-enum

Enum CompassPoint {case    west}var directiontohead = compasspoint.west Enum Planet:int {case    Mercury = 1 case    Venus = 2 case    Earth = 3}let Earthsorder = Planet.Earth.rawValue//ra Wvalue to get his original value: 3let possibleplanet = Planet (rawvalue:2)  //through the original value to find the corresponding enumeration member: Venus enum Direction {case up    Case         -down func description (), string{        switch (self), {case        . Up:            return ' up ' case        . Down:            return "downward"        }    }}print (Direction.Up.description ())

Transferred from: http://www.hangge.com/blog/cache/detail_515.html

Swift Dictionary and array