Swift

0000_0000_0000_0101 Pnchart-swift appeared crash solution Optional Swift Blog officially opened, team members: Pmst, Starry Night Twilight, Jim, ICE. Address: optionalswift.cn. The foreign visit is slow, you understand. These days have

Constants, variablesDeclaring constants: LetDeclaring variables: vareg. Let connum = 1; var num = 2; Basic data typesInt, Float, Double, Bool, tuples, optionalwhichTuples Ganso, can contain a collection of different types of values;Optional an

A float is a number with a fractional part, which can represent a larger range than an integer type, and the stored value can be much larger or smaller than the value stored in an int type. Swift provides two signed floating-point number types:A

The code in the global scope in 1,swift is automatically used as the entry point for the program, so the main function is not required. Also do not need to be in eachWrite a semicolon at the end of the statement.2, simple valueUse let to declare

First, the basic operatorlet a = 5 var b = ten b = Aif a = b{ The assignment operator in Swift does not return itself as a value, so compiling is illegal, helping developers avoid mistakes, very human language}Second, mathematical operatorslet dog:

Swiftyjson makes it easier to process JSON data in the swift language.With Swiftyjson all the To do is:? 1234 let json = JSONValue(dataFromNetworking)iflet userName = json[0]["user"]["name"].string{  //Now you got your value}

13 functionsOC function Definition:Returns a value type function name (parameter type parameter name, parameter type argument name) {}The Swift function defines:Func function name (parameter name: argument type, Parameter name: argument type),

12. The difference between conditional statements, where only the difference is written here, does not point out the difference in other respects OC is basically consistent with Swift12.1For if switch statement body in OC If there is only one line

First, the concept of computational propertiesThe computed property itself does not store the data, but instead computes the data from other storage properties, and the class, struct, and enumeration can define computed properties, unlike stored

We have been using swift as the new programming language for Apple for some time. One of the great advantages is what Apple calls "optional types". Almost all objective-c programmers know that using nil to represent an object of a reference type has

Dictionary CollectionA dictionary represents a very complex collection that allows you to access an element by a keyDeclaration and initialization of a dictionary collection:var strudentdictionary1:dictionary = [102: "Jack", "Mark", 107: "Jay"];

Functions can be used as a type, as a type without distinction from other data types:There are 3 definitions of the following functions:(1) Func Rectanglearea (width:double, height:double), Double {Let area = width * heightReturn area}(2) Func

1. The new features of Swfit should be fully utilizedFor example, if you follow the OC habit, call a delegate in the optional function should write thisif Delegate delegate!. Respondstoselector ("downloadprogress:progress:") { delegate!.

Initializing an empty stringCreate an empty string, you can assign an empty string literal to a variable, or you can initialize a new string instance: var emptystring = ""var anotheremptystring = String ()Two strings are empty, and equality can be

today or repeat yesterday do things--knock code, but the only difference is that the knowledge is different, we further to the deep level of learning, feeling more and more interesting, although near the end of watching everyone's enthusiasm is

Closures are functional self-contained modules that can be passed and used in code. Closures in Swift are similar to those in the blocks in C and Objective-c and Lambdas in other programming languages.There are three main types of closures:1. A

Demand:Swift develops and wants to display such time titles as "24 Seconds Ago", "15 minutes Ago", "Today 14:15". "Directly on the codeFunc friendlytime (datetime:string), String {Let dateformatter = NSDateFormatter () Dateformatter.locale =

Suppose a zlanimal class. I need to create TA when keeping a singletonThe practice in OC Static dispatch_once_t Oncetoken; Dispatch_once (&oncetoken, ^{ _instance = [[Zlanimal alloc] init]; });The approach in Swift is similar in that

In Apple's development documentation, the array also provides additional operational algorithms:1. Sort function:Sort the array, according to the specified collation, and look at the following code:var array = [2, 3, 4, 5]array.sort{$0 Print Now: [2,

Alamofire is the Swift language's HTTP Web Development Toolkit, which is powerful and supports a variety of HTTP method, JSON, file uploads, file downloads, and multiple authentication methods.Afnetworking's author of the new masterpiece, native