is Bridging-header.h, This can be understood as bridging the file between OC and Swift.。(4) Then in Bridging-header.h, introduced the OC class header file, the code is: #import "Hello.h"(5) Then in the OC class to implement a simple method, output a statement, the first declaration in Hello.h:。The method is then implemented using the OC syntax in HELLO.M:。(6) Then the method of calling OC in the Viewdidload () of Swift's class Viewcontroller.swift:。(
Swift Programming Language-how to use Inheritance in Swift, swiftlanguage
One class can inherit the methods, properties, and other features of the other class. When a class inherits other classes, the inherited class is called subclass, And the inherited class is called superclass (or parent class, superclass ). In Swift
Hybrid programming in Apple system development (2): mutual calls between Swift and C, system development swiftWhen performing mutual calls between Swift and C, it is necessary to first understand the type conversion relationship between the two languages:
C type
Swift type
Bool
CBool
Ch
What is the swift language? The following describes the swift programming language. Many of my friends are not familiar with swift because it is the latest programming language released by Apple on WWDC2014, let's take a look at the features of the language.
Some people cal
Go's original intention, is to make a tool out, improve the production efficiency of yards, rather than engage in language research and innovation. Tall apes, especially FP enthusiasts, can still despise the language.In other words, the author invented a language that looked at another language that he often used:Go's author--Look at C uncomfortable;Dart's author--looking at JavaScript is uncomfortable;Hack's author--To see PHP uncomfortable;Swift's author--See objective-c unhappy.Where should
then the loop repeats until the condition is false. Conditional statementsIf statementSame as C, no introduction here.Switch statementThe switch statement attempts to match a value to a number of patterns (pattern). The switch statement executes the corresponding code according to the first successful pattern. The If statement is usually replaced with a switch statement when it is possible to have more cases.Switch statements consist of multiple case. To match some of the more specific values,
; "src="/HTTP/ S1.51cto.com/wyfs02/m02/7d/13/wkiom1bfvvoy7isfaailyyxwcke072.jpg "border=" 0 "vspace=" 0 "hspace=" 0 "alt=" Wkiom1bfvvoy7isfaailyyxwcke072.jpg "/>Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn about the latest technical articles, books, tutorials and information on the public platform of the smart Jie classroom650) this.width=650; "Width=" "height=" "title=" Qrcode_for_gh_ca9759a5ef7f_258.jpg "style=" width:150px;height : 150px; "src=" http://s2.51cto.com/wyfs02/M00/
Closures are functional self-contained modules that can be passed and used in code. Closures in swift are similar to blocks in C and objective-C, and Lambdas in other programming languages. Closure is acceptable.
CaptureAnd store references to any constants and variables in the context. This is the so-called closure and enclose these constants and variables, commonly known as closures.
following results:////// The value returned isIf you create another incrementor, it will have a reference to your own independent runningtotal variable. In the following example, Incrementbysevne captures a new runningtotal variable that has no relation to the variable captured in the Incrementbyten: 7// // The value returned isIf you have a closure assigned to a property of a class instance, and the closure captures the instance by pointing to the instance or its members, you will create a st
default: 7println"Not a safe place for humans") 8 } 9}Else { Tenprintln"there isn ' t a planet at position \ (positiontofind)") One } A //prints "There isn ' t a planet at position 9This example uses an optional binding (optional binding), which attempts to access a planet through the original value 9. If Let someplanet = Planet.fromraw (9) statement obtains an optional Planet, if optional Planet can be obtained, the someplanet is set to the content of the optional Planet. In this exa
optionalstring and Optionalname All there is a specific value, but if optionalname=nil words, then Greeting output is hello! var " John Appleseed " var " hello! " if let name = optionalname { "Hello, \ (name)"} Else "Hello, anonymous "}Output resultsFalseHello, AnonymousSwitch supports any type of data and various comparison operations, which are not limited to integers and equal testsLet vegetable ="Red Pepper"SwitchVegetable { Case "Celery": Print ("Add Some raisins and make ants on a lo
Swift is a new development language for Apple in this WWDC conference, and the developer's website has released the introduction, tutorials and manuals for the new language, and if you have an iOS device in hand, search for Swift from its official bookstore via Apple's ibooks app, An ebook version of its Official handbook can be downloaded.Why is Apple launching a new language? Personal humble opinion, now
the current speed. The Automaticcar also provides a custom description method to output the current stop. class Automaticcar:car { var gear = 1 override var speed:double {didset {gear = Int (Speed/10.0 ) + 1 override func description ()-> String { return super.description () + } } When you set the Speed property of the Automaticcar, the Didset Viewer of the property automatically sets the Gear property to select a suitable stop for the new velocity. Specifically, the proper
Unlike other programming languages, Swift does not require you to create separate interfaces and implementation files for your custom classes and structs. All you have to do is define a class or struct in a single file, and the system will automatically generate external interfaces for other code. Note: Typically an instance of a class is called an object. However, in
We often use the for-in loop in the Swift programming language (also known as For-each in programming language terminology). Also, from the Swift 2.2 release, the For loop will only support the For-in form, not for the For i = 0; I In Swift, the standard library has defined
Today to the bookstore to see a book called "C # Internet of Things Programming fundamentals " books, interested in the internet of things I grabbed to see, the book is the project is the host computer development projects, simpler, if the Internet of things development is just this, it seems that I do IoT development is more than enough. I looked at this
, declare the struct body and the type method of the enumeration, and precede the Func keyword of the method with the keyword static. Note: In Objective-c, you can only define type methods (Type-level methods) for objective-c classes. In Swift, you can define type methods for all classes, structs, and enumerations: Each type method is called explicitly by its supported type, with the same type method as the instance method, in point syntax.class SomeC
"// println ("TheBank has \ (bank.coinsinbank) Coins"//Player has now left the game. This indicates that you want to set the optional Playerone variable to nil, which means "there is no player instance." When this happens, the Playerone variable's reference to the player instance is broken. There is no other property or variable that references the player instance, so it is freed in order to empty the memory it occupies. Before this occurs, its destructor is automatically called and its coins a
Classes, structs, and enumerations can define subscripts, and he can quickly and easily access the elements of a collection (set,array,dict), and you can make use of subscripts to get and set the collection elements. You can define multiple subscripts for a type, which can be overloaded by the different index value types, and the number of indexed values may be multiple.GrammarLook at an example firstSubscript (index:int), Int { get { // return an appropriate Subscript valuehere }
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