codecademy swift

Since I'm talking about the hybrid programming of Swift and OC, my last blog, Swift and objective-c mixed programming--swift call OC, is about calling OC code in a swift project, and now we're going to implement calling Swift code in the OC project, is also very convenient.

Convert ojective-c code to SWIFT code2015-03-09 15:07 release: Yuhang Browse: 201 More concise than the Objective-c,swift language.Sometimes we need to convert some of the original objective-c code into Swift, which summarizes a variety of common scenarios. 1, the migration objective-c of the constructor is: 1 hanggemenuitem *starmenuitem1 = [[Hanggemenuitem all

Swift identifier and keyword, swift identifier and Any computer language is inseparable from identifiers and keywords. The following describes the Swift identifiers and keywords in detail. Identifier An identifier is the name specified for a variable, constant, method, function, enumeration, struct, class, protocol, etc. There are certain specifications for the l

IOS: learning notes, Swift through Boolean (translated from: https://developer.apple.com/swift/blog/ Aug 5, 2014 Boolean)View Swift through Boolean A simple Bool type contains many major Swift functions. It is an interesting demonstration of how to build a simple type. this article will create a new MyBool type that is

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 with the latest features of Swfit and seamlessly incorporate into existing objective-c code.Mix and Match OverviewObjective-c and Swift files can coexist in a project, whether the project was originally based on objective-c o

First, IntroductionAs Swift matures, the use of swift development or hybrid development has become a trend, and Apple is recommending the use of Swift as a new language. Swift has now been updated to 3.0, and it is estimated that no more than 4.0 will come out. Then there are some unavoidable problems when developing w

By using a single line of code to do the same 10 exercises, let's take a look at the battle between Swift and other languages.　　Multiplies the value of each element in the array by 2Use map to implement var arr = [1,2,3,4]; var newArr = arr.map{$0*2} for item in NEWARR { print (item) }The code completes the array element by 2 simply and clearlyTo find a set of numbers andThis problem can be solved by using

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, inheritance is a basic feature that disti

Swift object-oriented explanation, swift object-oriented 1. First, let's take a look at how to define attributes, constructors, methods, and class methods in a Class and Class in Swift. Import Foundationclass Hello {// member attribute var _ name: NSString? = "Jikexueyuan" // constructor init () {}// overload constructor init (name: NSString) {_ name = name} // m

Implement the MD5 algorithm using Swift introduce a third-party class library (MBProgressHUD), and implement the MD5 algorithm using Swift Previously, the project used the MD5 encryption algorithm written by objc, and recently used swift to rewrite previous projects. Fortunately, it was finally solved. This solution also introduces third-party class libraries, s

Common keywords in swift * * Keywords used as a declaration: * * class deinit ,, init ,,,,, enum extension func import let ,, ,,,, typealias protocol static struct subscript var Keywords to use as statements break case ,, fallthrough ,,,, , if continue default do else in ,, where ,,,, for return switch while Keywords to use as expressions and types: a

Swift is a type-safe language, and the type-safe language requires a very clear type of value in the code. If you have a partial value in your code that requires a string type, you cannot pass int incorrectly. Given Swift's type safety, when compiling code, Swift performs type checking and marks any type mismatch as an error, allowing you to catch and fix errors as early as possible in development. Type c

In Swift, you can directly use the APIS provided by Objective-C language (including the system framework and custom code), and use the classes and APIs provided by Swift in Objective-C, it can also use both Swift and Objective-C languages in a single project. The two languages can interwork and interact with each other. Any Objective-C framework or C library (inc

Swift provides a C-like process control structure that includes a for and while loops that can perform tasks multiple times, select if and switch statements that execute different branches of code based on specific criteria, as well as break and continue statements that control the flow to other code.In addition to the traditional for conditional increment loop in C, Swift also adds a for-in loop to make it

original articles, welcome reprint. Reprint Please specify: Dongsheng's blog in the Swift before the advent of language, development IOS or OS X Application Main Use objective-c language, you can also use C and the C + + language, but UI parts can only be used objective-c language. Select languageSwift after the advent of the language, Apple gives programmers more options to coexist in both languages. Since they coexist, there are 4 ways we can choose

Dictionaries (dictionary)A dictionary is like a container that can hold a number of values of the same type. Each value has a unique key associated with it, and the key in the dictionary acts as if it were an identity card for each value. Unlike elements in an array, each element in the dictionary does not have a fixed sequence. When you use a dictionary and you want to query a value, You need to use the value's identity (key). It's like you use a dictionary in your life to find the definition o

A class can inherit (inherit) and has a class method, property, and other features. 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, inheritance is a basic feature that distinguishes a class from other types. In swift, classes can call methods, attributes, and subscripts of superclasses, and c

Swift 2.0 Study Notes (Day 11)-What about data types ?, Swift Study Notes For Original Articles, please reprint them. Reprinted Please note: Guan Dongsheng's blog When we learn a language, we will learn the Data Type of this language. What types of data are available in Swift? Integer, floating point, Boolean, character, and string types are certain. The set, en

syntax and more readable. Examples of the use of 4,linq The following is an example of using a collection of data in the LINQ operation memory.For example, we have a collection of contacts with the names, age, and telephone numbers of the three attributes. We just want to find people under the age of 40, and only the contact name and age can be returned in the result set (note that we don't need a phone here).Then the combination of the WHERE statement and the SELECT statement is available, a

Swift is a new language for designing IOS and Mac OS X applications.Swift Features? Swift retains the strengths of C and Objective-c and rejects the restrictions it has imposed in order to be compatible with the C language.? Swift incorporates a secure programming model and adds some modern features to make it easier to use, more flexible, and more fun.? Swift's