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function, just as you would with other types in swift. For example, you can define a constant or variable as the type of the function and assign a variable in the corresponding function:var mathfunction: (int, int), int = addtwointsThis code can be read as:"Defines a variable called mathfunction, which has a type of function, which takes two int values and returns an int value, and setting this variable requires referencing a function called addtwoin

First, mind mapSecond, the Code//This will make the code very ugly . ifX! = Nil Y! =Nil {print ("x or Y are not equal to null")} print ("x or Y has an empty") //1 use??Let name:string? ="I am the most handsome"Let age:int= - //?? Represents a selectable unpacking package//The following two execution results behave differently due to changes in values,Print (name??""+ String (age))//I'm the most handsome, because he has the lowest priorityPrint (name??"") + String (age))//I am the

following method requires the Somefunctionthattakesaclosure function pointer passed into the previous interface, Func initwithclosure (closure:sendvalueclosure?). {//Assign the function pointer to the Myclosure closure, which covers references to local variables in the somefunctionthattakesaclosure function myclosure = closure} init (Nibname nibn Ameornil:string, bundle Nibbundleornil:nsbundle?) {Super.init (Nibname:nibnameornil, Bundle:nibbundleornil)//Custom initialization} override func View

If you want to make a custom configuration, you can inherit the base class UIView.The map app needs to touch multiple touch more.Opaque non-transparentHidden hidden, such as the download of the progress bar, if downloaded, you can set this property to make the progress bar disappearClears graphics context If a view needs to update the content, you can check this property by clearing the previous contentClip Subview truncate the child view boundary if the child view of a view is a button, but thi

Swift keyword summary and swift keyword Summary There are four common keywords: Declaration-related keywords: class, deinit, enum, extension, func, import, init, let, protocol, static, struct, subscript, typealias, and var. Statement-related keywords: break, case, continue, default, do, else, fallthrough, if, in, for, return, switch, where, and while. Expression and type Keyword: as, dynamicType, is, ne

Build a binary tree (swift) and a binary tree swiftBuild a binary tree (swift) PublicclassALTree Var key: T? Var left: ALTree? Var right: ALTree? Func addNode (key: T ){ If (self. key = nil ){ Self. key = key Return } If (key If (self. left! = Nil ){ Left !. AddNode (key) } Else { Var leftChild: ALTree = ALTree () LeftChild. key = key Self. left = leftChild } } If (key> self. key ){ If (self. right! = N

[Swift learning] Swift programming tour-collection type Dictionaries (8), swiftdictionaries A dictionary is a storage that stores multiple types of data. Each value is associated with a unique key as the identifier of the value data in the dictionary. Unlike the data items in the array, the data items in the dictionary are not in specific order. Dictionary writing Dictionary Create an empty dictionary var

Swift UI special training 43 Swift APP boot page, swiftui When an APP is loaded for the first time, a boot page is usually used to show features or tell users how to use them. Open our Storyboard, import a Page View Controller, make the following settings, and modify the Transition Style: Set the storyboard ID to PageViewController for our Page View Controller. Now you should want to know how we can edit o

Swift social application text input optimization summary, swift social text SummaryI. Input-Related Optimization Problems In most applications, there is a need for input. In the face of a large number of users, their ideas vary, and the input text content is strange. In the face of different input, how should we optimize the input experience? Here we will summarize the Input-related questions, mainly as fol

Zhao yazhi _ Swift (4) _ asserted, Zhao yazhi _ swift asserted Optional. You can determine whether a value exists. You can optimize the processing of missing values in the code. However, in some cases, if the value is missing or does not meet specific conditions, your code may not need to be executed. In this case, you can trigger an assertion in your code to end code running and debug the code to find the

Random Number Generation (swift), random number generation swiftRandom Number Generation (swift) by Wu xueying OverridefuncviewDidLoad (){ Super. viewDidLoad () For _ in0... 100 { Println (randomInRange (1... 6 )) } } Func randomInRange (range: Range Let count = UInt32 (range. endIndex-range. startIndex) Return Int (arc4random_uniform (count) + range. startIndex} Copyright Disclaimer: This ar

Use md5 in swift and md5 in swiftUse md5by Wu xueying in swift Add # import Let cString = self. cStringUsingEncoding (NSUTF8StringEncoding) Let length = CUnsignedInt ( Self. lengthOfBytesUsingEncoding (NSUTF8StringEncoding) ) Let result = UnsafeMutablePointer CC_MD5 (cString !, Length, result) ReturnString (format: "% 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x % 02x %

Functions and closures functions and closures) Use of functions There is a significant difference between Function Definition and OC in swift. Use func to define the function, define the number and type of struct in brackets, and use-> to define the type of return value. func greet(name: String, day: String) -> String { return "Hello \(name), today is \(day)."}greet("Bob", "Tuesday") Use a single tuple () to return multiple return values func

fengsh998 Original address: http://blog.csdn.net/fengsh998/article/details/30354127 reprint please indicate the sourceSwift does not use a new set of threads, using a set of threads from the OC source. The following example illustrates the use of threads in Swift.Its use includes common: NSTHREAD,NSOPERATIONQUEUE,GCGImport UIKit class Swiftthreaddemo:uiviewcontroller {var queue = Nsoperationqueue ()//init ()//{ Alloc//Super.init ()//} deinit {//dealloc} func Test Gcdthread () {Dis

While watching Apple's official swift language, there was an experiment: the Write an extension for the Double type, which is the add an Absolutevalue property. When you add attributes directly using extension, there is an error (of course, the code is not finished, playground is good to use).Extension double {//Add Absolutevalue property to double type by using extension. var absolutevalue:double { }}result Error, said: ' var ' declaration wit

conditions in the code development phase, and assertions are an effective reminder of the importance of highlighting in this case (before you should publish).Basic Operators (base operator)Operators are specific symbols that can be used to check, change, or combine values. For example, the addition operator (+) adds two numbers together (for example, let i = 1+2). Complex also has logical and (and) operator (e.g. if Entereddoorcode Passedretinascan) and the auto-increment operator ++i, which

Mutability of Collections (variable collection)Dictionaries and Arrays store multiple values in a collection. If you create an array or dictionary and assign a value to a variable, the set is mutable (mutable). This means that after you create the collection, you can still change the size of the collection, add elements to the collection, or delete existing elements. instead , if you create an array or dictionary assigned to a constant, then this set is not modifiable, meaning that the dictionar

Swift variables and functions, swift Variable Functions Func getNums ()-> (Int, Int) {// the swift function can return multiple variables return (2, 3)} let (a, B) = getNums () // let is a constant, which cannot be changed once assigned values. var is the println (a) variable. // The output 2var f = getNums // function is an object and can be used as a variable.

Swift cainiao getting started video tutorial-10-attributes, swift-10- I am a beginner to swift cainiao recorded by myself. You are welcome to make a brick. If you have any questions, please leave a message here. Main content: Storage Properties)Computed Properties)Property observer)Global and Local Variables)Type Properties) Video address: Baidu Network Disk

Swift 2: You can use @ NSManage to mark the automatic generation method. swift @ nsmanage View Final Version Original article linkAuthor: Tomasz SzulcOriginal Article Date:Translator: mmoaay; Proofreader: numbbbbb; Final: shanks Swift 2 in Xcode 7 beta 5 has another feature: we can use@NSManagedTo declare the automatic generation method. This technique i