codecademy swift

Swift journey: 1. Overview-using Swift to implement a simple calculatorResources used for study: Stanford Open Course: iOS 8 Development Netease blank course class link: Stanford Open Course: IOS8 DevelopmentSubtitle link on github: subtitle Baidu online storage resource download link: Baidu online storage1. Detailed explanation of four layers of IOS programming ① cocoa touch layer this is our longest used

Swift closure expression, swift closure expression 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. There are three types of closures: 1. A global function is a closure with a name but no value is captured. 2. A nested funct

How to pass the Selector parameter in Swift and the selector parameter in swift @ Selector of Objective-C is replaced by the Selector struct in Swift. In Swift, we can use string constants to construct Selector. For example: let mySelector: Selector = "tappedButton:" Because the string will be automatically converte

Swift brings many really great features, making it difficult to return to Objective-C. The main feature is security, but this is also seen as an additional side effect.Strongly typed APIs Swift has a strong type, which means that, unless required, Swift will not convert between types for you. Therefore, for example, you cannot assign the Int type to the Double ty

String is the string type of Swift. A string is a valid sequence of characters, so you can also make a character set fit.A string can be concatenated with the + symbol. The string type is a fast, modern string implementation. Each string consists of independently encoded Unicode characters and provides support for accessing these characters in different Unicode representations. Use "" to mark the string.　　First, initialize the empty string　　var emptys

Swift getting started tutorial 19-generic, swift getting started tutorial 19- Original Blog, reprinted, please indicate the source Blog.csdn.net/hello_hwc Generic definition Similar to C ++, generics define a reusable code that is applicable to any type and implements code in an abstract way. Both Array and Dictionary of Swift are implemented using generics, Bec

Swift syntax Summary (1) and swift syntax summary supplement 1. The optional type is a type, String? Is Optional 2. ?? B ?? C If a has a value, return a, a is nil, return B, and B is also nil. The previous overall result is nil, and return c. Condition ?? All the preceding operations must be optional ,?? The following types must be the same ?? The preceding results are consistent. The result is equivalent t

In any language, functions are very important, and today we are going to take a preliminary study of the functions in swift.1. Swift function Default parameters:①, can be placed in any position of the function;②, external name and internal name are consistent;③, call time can not write;④, defined in the parameters passed in when the function is defined.Func joinstring (s1:string, toString s2:string, joiner

Open-source Swift running on Linux platform Swift is open-source. After Xi Da Pu Ben, we found that it has now become cross-platform. The open-source Swift not only can run on MAC and iOS platforms, but also on Linux platforms. Now let's take a look at Swift on Linux.Install the Linux environment The swift.org website

Swift's compatibility with objective-c allows you to use both languages simultaneously in the same project. You can use this feature called mix and match to develop a hybrid-language application that can use the latest features of Swfit to implement a subset of the functionality of the application and seamlessly incorporate existing OBJECTIVE-C code. Mix and Match Overview Objective-c and Swift files can coexist in a project, whether the project was

This article focuses on the simultaneous use of swift and OBJECTIVE-C code in a project, and the simultaneous use of swift and objective-c mixed language programming in one project.Swift's compatibility with objective-c allows you to use both languages in the same project. You can use this feature called mix and match to develop a mixed-language application that can implement part of the app's functionality

Programmers are often thought of as stiff, nerdy, and confused. But sometimes, we can use our own skills to express our romantic. Because the swift language is Unicode-encoded, Unicode has the latest support for emoji (emoji) emoticons. So, I think, can we use swift+unicode for romance?Nonsense not to say, directly on the code:Let love = "xxx, I \u{1f491}\u{1f492}\u{1f493}\u{1f495}\u{1f496}\u{1f497}\u{1f498

=Someclass.bar - - //then using F1 () is equivalent to calling Sc.test () + F1 () - //then using F2 () is the equivalent of calling Someclass.bar (msg:). +F2 ("Hello") A at - //the external parameter name of the ************ method *************// - classperson{ - var name:string - Init (name:string) { -Self.name =name in } - func Eat (food:string, _ drink:string, cigarette:string) { toprintln"\ (self.name) eating \ (food) drinking \ (drink) smoking \ (cigarette)") + } - } thevar p =

stickedFirst of all, we'll use iOS's own navigation controller to build a simple foundation for an app,Create a new empty application and 3 Swift files, named: Firstviewcontroller,secondviewcontroller,thirdviewcontroller;Also rewrite the Viewdidload () method of the inheriting class in three Swift controllers:Override func viewdidload () { super.viewdidload ();}The Appdelegate.swift file in the whole

Functions (function)A function is a piece of code that performs a specific task. Identify and invoke them by name.In swift, each function has a type, including the parameter type of the function and the type of the return value. These types are used in the same way as other types in Swift, which allows functions to be passed as arguments to another function, and functions can be returned from one function,

In Swift, a function is actually a special composition (closure), you can also define an anonymous composition (closure), write the code in ({}), and use in to separate parameters and return values.Numbers.map ({(Number:int), Int inLet result = 3 * numberreturn result})　　Experiment//Exercises　　Rewrite the closure to return zero for all odd numbers. Rewrite writes a composition that returns a value of 0;For more precise use of the composition (closures

Swift 2.0 Project Development Summary II (common development)A: Photo album in the selection of photos to the app location with the increase in camera pixels, the actual user selected pictures are very large, and some up to 5.6M, if directly using the user selected pictures, very consumption of memory, and also can not use such a high-pixel picture, when the user selected a good picture, In the Uiimagepickercontroller corresponding proxy method, the p

Some small Swift knowledge points and Swift knowledge points Some basic things of Swift were first understood and simply sorted out. Import UIKitvar names = [] class ViewController: UIViewController, UIAlertViewDelegate {override func viewDidLoad () {super. viewDidLoad () var stringValue: String! // StringValue = "chw" // let str11 = stringValue. hashValue // va

Swift global variables, local variables and type attributes, swift global variables Global and local variables The pattern described by the calculation property and property monitor can also be used for global variables and local variables. global variables are variables defined outside functions, methods, closures, or any type, local variables are defined within functions, methods, or closures. The global

Swift receives fruit game ios source code and swift fruit ios source code Swift is a beginner. The game is very simple. as its name implies, it can only pick up fruit. Pineapple cannot pick up. One point is received for a fruit, five points for a pineapple, and one point is deducted for a missing fruit, the initial score is 0. When the score is less