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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

Application source code similar to "on demand" compiled by Swift, swift source code An App written in SwiftOverview This project was prepared to consolidate Swift's knowledge. The materials are from the official App Use Storyboard + Xib + Autolayout to implement the UI part Because the project is not complex, the directory structure is relatively simple. A module corresponds to a folder. There is

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

classes, which means that all other inherited properties are properly initialized at the time of construction.struct Rect { var width:double = 10.0 var height:double = 10.0 init () { } init (h:double) { s Elf.height = h println ("H is \ (h)") } init (printh:double) { self.init (h:printh) }}var Graph:rec t = rect (printh:3.2) var graph2 = rect (h:4.3)The struct provides 3 constructors, one is an empty init, no action is taken, one is passed in

Shareview = Shareviewcontroller () Self.presentviewcontroller ( Shareview, Animated:true, Completion:nil) } @IBAction func message (Sender:uibutton) { if Self.cansendtext () {let Messagevc = Self.configuredmessagecomposeviewcontroller () Presentviewcontroller ( MESSAGEVC, Animated:true, Completion:nil) } else {let Erroralert = Uialertview (title: "Cannot send", message: "Your device is not short Function ", Delegate:self, Cancelbuttontitl

first initialize the existing value to a new number of the desired type. In the following example, the type of the constant Twothousand is UInt16, and the type of constant one is UInt8. They cannot be added directly because the types are different. Therefore, this example invokes UInt16 (one) to create a new UInt16 number, initializes a numeric value, and replaces the original (the original value is UInt8) with the new initialized value (the new value is UInt16): 1 Let twothousand:uint16 = 2_0

SwitchA switch statement contains a value that is compared with several other possible matching patterns, and then executes the corresponding block of code based on the pattern on the successful match. The switch statement provides more options than the IF statement to respond to a variety of potential situations.One of the simplest examples:Switch some value to consider {Case value 1:respond to value 1Case value 2,Value 3:Respond to value 2 or 3DefaultOtherwise, do something else}Each switch st

inferring type from context type judgmentBecause the ordered closure is passed as a parameter to the function, Swift can determine the type of the parameter and the type of the return value based on the second parameter of the sort function. The type of this parameter is (string, string), Bool, which means string, Both string and bool types do not need to be declared when the closure is defined. Because all types can be determined by the system. There

Gcd encapsulation (swift) and gcd encapsulation swiftGcd encapsulation (swift) by Wu xueyingOverridefunc viewDidLoad (){Delay (2 ){Println ("2 s later ")}Let task = delay (5 ){Println ("call ")}Cancel (task)}Typealias Task = (cancel: Bool)-> ()Func delay (time: NSTimeInterval, task :()-> ()-> Task? {Func dispatch_later (block :()-> ()){Dispatch_after (Dispatch_time (DISPATCH_TIME_NOW,Int64 (time * Double (N

Swift-Add a custom return button in the navigation bar and swift-navigation bar // 1. Add the return button Func addBackBtn (){ Let leftBtn: UIBarButtonItem = UIBarButtonItem (title: "back", style: UIBarButtonItemStyle. Plain, target: self, action: "actionBack ") LeftBtn. title = "back "; LeftBtn. tintColor = UIColor. whiteColor (); Self. navigationItem. leftBarButtonItem = leftBtn; } // Return butt

Swift: Regarding closures and functions, swift Functions When you call a function with the closure parameter: Function implementation: When the closure is a parameter, there is a type of return value for the parameter; When the closure is called, input parameters When calling a function: the closure is a parameter, which is the implementation of the closure. When the closure is the last parameter, it ca

Swift 2.0 Study Notes (Day 12) -- talk about several special operators, swift Study Notes For Original Articles, please reprint them. Reprinted Please note: Guan Dongsheng's blog In addition to some common operators, there are also some other: • Reference Number (.): operator such as instance call attributes and methods. • Question mark (?) : Declares the optional type. • Exclamation point (!) :