Swift

Let me first design a class: There is an account (bank accounts) class, assuming it has 3 attributes:Amount (account amount),interestrate (interest rate), and owner (account name). of These 3 attributes, amount and owner will vary from one account

The syntax for classes and struct-body definitions in Swift is very similar. Classes use class keywords to define classes, and struct keywords are used to define structs, and their syntax is formatted as follows: Class name {Defining members of a

You see a question mark (?) and an exclamation point (!) in the SWIFT program expression, what do they mean? These symbols are related to the optional type and the optional chain, and look at the optional chain below. Optional chain:Class

Let's start by looking at the following code:  var N1: Int = Ten N1 = Nil//Compile error Let str: String = Nil//Compile error int and string types cannot accept nil, but sometimes it is unavoidable that

Basic OperatorsSwift supports most of the standard C-language operators, and has made some improvements to help developers make fewer low-level mistakes, such as: when you should use = =, write down a =, if x = = y {...} is written as if x = y {...}

Panda Pig • Patty original or translated works. Welcome reprint, Reprint please indicate the source.If you feel that the writing is not good please more advice, if you feel good please support a lot of praise. Thank you! Hopy;) You have

1. Use let to declare constants and use VAR to declare variables.Note: You can declare multiple constants or multiple variables in a row. separated by commas.2. Type callout Assuming that the initial value does not provide enough information (or no

Document Number:Application Development Swift Coding specification(Version v1.0.0 ) Written information Subject headings: Code specification for Swift development Author Week less Stop

The Swift array is used to store a sequential list of values of the same type. Swift is strictly checked to not allow different types of values to be in the same arrayDeclares an arrayvar Somearray ==30)// Declare an array of three capacities with

Introduction: This article mainly discusses: function definition, the use of external parameters, no return type of three function definition modeThe definition of closures, the concept and usage of closures, the notation of trailing closures, the

One: Create a string//There are two types of string creation//Immutable StringLet str ="I ' m a string"//variable StringVarstring="I ' m a mutableString1"//variable string initialization and re-assignment of valuesvar

First we create a circular referencevar Nameb: ((), ())?Overridefunc viewdidload () {super.viewdidload () let Bu=UIButton (type:. Contactadd) Bu.addtarget (Self, Action:"Tap", forControlEvents:. touchupinside) View.addsubview (BU) run {print ("name")

First straight to the chase: @ibinspectable & @ibdesignable for @IBInspectable and @IBDesignable See official documentation: Creating a Custom View that renders in Interface BuilderOf course, you can also read the following Chinese version:

varUnnumber =[23,76,42,9,7,0,1,37,4,2,89,23,45,56,87,65,20,15,23,15,17]varNumber = [ +, -, -, -, the, -, -, A, One,Ten,9,8,7,6,5,4,3,2,1,0]varNumber2 = [ +, -]varNumber1 = [ +]// To swap number func swapvalue (inout left:int, InOut _ Right:int) {

Original articles, welcome reprint. Reprint Please specify: Dongsheng's BlogSwift There are two sources of the subclass constructors in: write themselves and inherit from the parent class. Not all constructors of the parent class can inherit, and

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog Use var or is Let ? in the course of our development, when did you define the keyword as var , or is defined as Let it? Actually AH all can satisfy our demand, then how

LanguageUse American English spelling to match Apple's APIPreferred: var color = "Red" is not recommended: var colour = "Red"Interval Use 2 spaces to indent and not tab so you can save space and prevent line breaks. Make sure the settings

Create Class (overload effect)Create class MyClass { //Properties member variable init () { ///Constructor constructor } //Method member methods func doIt () { println ("DoIt") } func doIt (), Int {

Original articles, welcome reprint. Reprint Please specify: Dongsheng's Bloga lot of computer language has identifiers and keywords, has not been a good summary, is such a use, now a small tidy up Swift the identifiers and keywords in the. What is

The system-provided avcapturesession is only suitable for systems above iOS7.0. Please use Zbar to replace the previous: http://download.csdn.net/detail/huobanbengkui/8881097To configure project:Introduced:Import FoundationImport AvfoundationAccept