Swift

Code:enumarithmeticexpression {//Related Values CaseNumber (Int)//Recursive enumerationIndirect Caseaddition (arithmeticexpression, arithmeticexpression) indirect Casemultiplication (arithmeticexpression, arithmeticexpression) indirect

1. Custom type TypealiasSwift makes it easier to define various types, where aliases are handled using Typealias.Example Description:typealias mysize = UIntvar size:mysize = 1002, meta-groupTuple syntax allows you to combine values of several

Recently in learning iOS development, take notes down! Constants and variables Let-constants Constants let maxNum =32 Var-variables variable varindex0 Declare multiple variables at the

Posted on August 14, 2015One of the world's ongoing discussions about Swift is when to use structs when to use classes. I think I'm going to contribute some of my own ideas today.Value VS ReferenceThe answer is simple: when you need the value

Tag:swift    navigation controller     Agent    ios development     viewcontroller.swift//navigationcontroller//import uikitimport foundationclass ViewController: Uiviewcontroller,fontsizechangdelegate {var mylabel:uilabel?;/ /declares an

To make use of. Let to declare constants, so that var to declare the variable.? A constant value is not required at compile time, but you can only assign a value to it? once. So you can? Use constants to table? A value: You just need to decide,

main.swift//Control Statement -03//import foundationprintln ("Hello, world!") Define a fraction var score = 80;/*** Define an array */var Scorearr = [90,99,45,89,67,54];var minscore = 0;var Maxscore = 0;var Avgscore = 0 .0;var Sumscore = 0.0;var

First create a new Click on the new Testinfo.xcdatamodeld will appear this interface After creating Testinfo.xcdatamodeld Appdelegate will automatically help you to add support CoreData code interested in your own research First, use

A dictionary is another collection type of Swift in addition to an array. The basic concepts of dictionaries are explained below.var dictionary = [1: "A", 2: "B", 3: "C"]1) The data stored in the dictionary is the data pair of the key and the value;2

Summary of Swift syntax1. Optional is an enumerationAn enum of Optional is justEnum optional{Case NoneCase Some (T)}Statement of the 2.Arrayvar a=array ()var a=[string] ()Let a=["a", "B", "C") cannot be changedLet B=a[3]Traversing an array can use

As an example: 0 ... 3 and 0. 0...3 is a range that represents 0 to 3 and includes 3, becoming a fully closed interval equivalent to [0,3] in mathematics... For this range we can use for. In traversal, I used the previous blog to write arrays, such

Development environment: Xcode 7 Beta 41.1: Deploy the Preliminary schema1. 2 Setting the root controller (appdelegate.swift) func Application (application:uiapplication, didfinishlaunchingwithoptions launchoptions: [NSObject: Anyobject]?) -Bool {

The main content of this article comes from the book "Functional Programming in Swift", a bit of a so-called post-view summaryIn the introduction chapter of this book:We'll try to focus on some of the qualities so we believe well-designed functional

Before you write Swift's Singleton method, you can review the objective-c of the single example: 1 + (Instancetype) sharedsingleton{ 2 static id instance; 3 4 Static dispatch_once_t Oncetoken; 5 dispatch_once (&oncetoken, ^{ Span style=

Some basic things to know about Swift in the first time, simply sort it out.ImportUIKitvarnames = []class viewcontroller:uiviewcontroller,uialertviewdelegate {overridefuncViewdidload () {super.viewdidload ()varstringvalue:string!//StringValue = "CHW"

String as a very important data type, there are many methods of operation. We hit explain.(1) string interpolation: string interpolationDifferent data types can be output as a string type at print time, and can be output using the "\ (variable)"

I looked for a night on the internet yesterday, but most of them are OC Grammar, swift information is too little, so that I just get the introduction of Swift color brushes, the back has been a variety of data, finally let me findVisiblecells This

One, underlineIn Objective-c, the underscore (_) is not much of a function, generally used to define variable names, such as the definition of member variables int _age; But in Swift, it has a very powerful effect.1. Only as a markervar money = 1_000

First step: Create and configure Bridging-header.hSwift and OC are mixed, first there must be a. h file, where you use Bridging-header.h and then set the project's build Settings--swift compiler--objective-c bridging The Header content is

At the time of the project, if the Uitabbarcontroller of the system is used, the tab custom image at the bottom is blue and gray, which is not the effect we want.If you want to display a custom pressed and bounced picture effect, you need to modify