Swift

Seven, use Alamofire for file download 1, custom download File save directoryThe following code downloads the logo picture to the user's document directory (Documnets directory), and the filename is unchanged. Alamofire.download (. Get,

1 Import Foundation2 //variable declarations use3 4 //use let to declare a constant, use Var to declare a variable constant to assign it only once5Let Name="Cuiyw";6 varAge:int= -;7 //The compiler automatically infers the type when declaring the

Text: How to use the JSON data tutorial in the Swift languageThis is a translation of the article, the original source: http://www.raywenderlich.com/82706/working-with-json-in-swift-tutorialHow to use the JSON data tutorial in the Swift languageJSON

1. Introduction:Swift is a new programming language for iOS and OS X to be programmed, based on C and objective-c, without some compatibility constraints for C. Swift uses a secure programming model and adds modern features to make programming

After we released the Swift language learning course, we received a lot of emails and private messages to ask if we still need to learn C or objective-c. In addition, people seem to be wondering what parts of the iOS development ecosystem Swift is

Extensionuiimage{/** Gets the pixel color value in the picture-parameter pos: position in picture-returns: Color value */func Getpixelcolor (POS:Cgpoint) (Alpha:CGFloat, Red:CGFloat, Green:Cgfloat,blue:CGFloat) {Let pixeldata=Cgdataprovidercopydata (

In Swift we have a powerful high-level logic abstraction, while low-level operations are deliberately limited. But in some cases we still want to do some hack work in C, and the cat will take a look at how to do it.Hacking is happy!!! ;]As the title

Method (methods) and the following table script (subscripts) Instance method (Instance Methods) Type method (Type Methods) The following table script (subscripts) A method is a function that is associated with some particular

The error handling mode of the Swift 1.x has many drawbacks, for example: in order to save time in programming, passing a nil to the error parameter, or not judging whether the error is nil after the method call is complete, and not handling error.

Preface: Today to share a very beautiful powerful chart library, I hope that the students who need help, like to please a praise, support. Thank you!How to join the Swift library in a project see my previous

Today's blog is a comparative basis, or that sentence, the basis of this thing is the most important. When it comes to functions, as long as you've written a program, you know exactly what the function is, and today we'll talk about the features of

son‘ has no initializers-‘Person‘ 类没有实例化器sCause: If a required attribute is defined in a class, you must allocate space for these required properties through the constructor and set the initial value 重写The constructor of the parent class

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

Swift Programming Idea Part 4:map all the things!2015-10-22 837 Article Directory 1. array vs. optional type 2. map () acting on an optional type 3. back to our example 4. Let's use map . 5. where is the problem? 6. FlatMap () to

1. Use class to create a class in Swift. The declaration of a class is declared in a class as a constant or variable, except in the context of the class. This is also the case in methods and functions.2. Use init (...) in Swift As a constructor of

Define an empty stringvar str1 = ""var str2 = String ()Str1.isempty//Judging if the string is emptyAll characters in the output stringvar str3 = "As God name"For C in str3{println (c)}Maximum value of type int.max//intMinimum value of type

Mathematical principle derivation: f (x) = x2-n---formula (1) n is a value that requires a square root, such as the square root n = 100, which requires 100, so the problem is converted to the 0 point of F (x), the derivative of f (Xn) is the slope

At WWDC we found that the swift team did not waste time in pointless places, but was committed to improving Swift 2.We will write and record many tutorials for you on Swift 2, but in the meantime I would like to highlight the most exciting changes

Actually, closures are functions.function as a conditionClosed-Packet expressionFirst declare an arrayvar names = ["Charis""Alex""Ewa""Barry""Daniella"]Sort this array alphabeticallyDeclaring a closed-packet functionfunc backwards(s1: String,

Transfer from http://www.cnblogs.com/gcb999/p/3775053.htmlBo Master language has been bad (if there are any typos, please comment) hope you understand, have not learned anythingToday encountered a very annoying thing is that 10 o'clock in the