android swift tutorial

in the SWIFT project to build a random objective-c class, you will be prompted to generate a Bridging-header, click Yes, and then delete the Objective-c class just created, leaving only [project name]-bridging-header.h file. in the [project name]-bridging-header.h file write:#import Then write a function that generates MD5:class func md5string (str:string),string{ var cStr = (strasnsstring). utf8string var buffer =unsafemutablepointerUInt8 . A

height, or equal to 40% of the screen height, and the last rendered effect chooses the smaller of the two heights.Now you should notice that in the preview panel, the 4-inch horizontal screen shows the immediate response to the constraint changes you just made:Do you have a look at other size previews that are automatically updated? The answer is a must, so the Preview Assistant Editor is really a major improvement, a boon for programmers and designers!Since the example in this article is a wea

Get to know the Swift on the Android platform of Kotlin. The Kotlin syntax is concise and has the characteristics of a series of dynamic languages, Lambda expressions, high-order functions, closures, and even type checks for static languages. The core point is to write the same function, kotlin requires a lot less code. The following is a JAVA data class public class Artist { private long id; private

Directly on the code, as follows:/** * get the width and height of a string** @param text:nsstring* @param font:uifont** @return CGRect*/ classfunc gettextrectsize (text:nsstring, font: Uifont , Size: cgsize ),cgrect { var attributes = [nsfontattributename: Font] var option =nsstringdrawingoptions. Useslinefragmentorigin var rect:cgrect = text. boundingrectwithsize (Size, options:option, attributes:attributes, context: nil)println ("Rect:\ (rect)"); return rect;} Copyright NOTICE:

Swift getting started tutorial 15-extension)1. extensions DefinitionExtension is to add new functions to an existing class, struct, or enumeration. The extension does not need to obtain the source code of the original class.The extension is similar to the categories in objective C.Extended functions include1. Calculation attributes and calculation static attributes (you cannot add storage attributes and att

When doing the project, assume that when using the system's Uitabbarcontroller, the bottom tab itself defines the picture to be blue and gray. This is not the effect we want.Suppose you want to display your own defined, pressed and bouncing picture effects. At this time, the Tabbaritem needs to be changed.Here is a detailed demo sample:var itemnamearray:[String] = ["down_32","add_32", "Plane_32" , "Circle_32" ]var itemnameselectarray:[String] = ["down_click_32","Add_click_32" ,"plane_click_32",

)))//llo wo 5 string concatenation Very simple answer, with a plus + or string interpolation var str1 = "hello" var str2 = "world" var str = str1 + str2 var str2 = "\(str1) hwc and the \(str2)" //hello hwc and the world 6 Case Conversion str.uppercaseString //HELLO WORLD str.lowercaseString //hello world 7 prefix suffix equals Bool Hasprefix (prefix:string) Bool Hassuffix (suffix:string) var str = "hello hwc" str.hasPrefix("hello") //true str.hasSuffix("123")

the task and execute the task. First open Xcode to build a new project, select the Swift language, then just modify the default created Viewcontroller(1) Define an abstract implementation scheme (protocol), which follows the implementation of two eventsProtocol hwcsleepdelegate{func Willstarttosleep ()func Didfinishedsleep ()}(2) Define function classes to simulate long-time tasksclass hwcsleep{ var delegate:hwcsleepdelegate?func starttosleep (time

implementationNote: Optional protocols are only valid in the @objc prefix protocol@objc indicates that the protocol is optional and that it can be exposed to objective C, and that the protocol is valid only for classesFor example@objc protocol Counterdatasource {optional Func incrementforcount (count:int), intoptional var fixedincrement:int { Get}} @objc class Counter {var count = 0var Datasource:counterdatasource?func increment () {if let amount = DataSource?. Incrementforcount? (count) {count

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