swift playground tutorial

Original blog, reproduced please indicate the sourceBlog.csdn.net/hello_hwcDefinition of a generic typeSimilar to C + +, generics define a kind of reusable code for any type that implements code in an abstract way. Both the array and the dictionary of Swift are implemented with generics, because arrays can hold variables of type string, or they can be of type int.As an example,Func swaptwoints (inout a:int, inout b:int) {let Temporarya = a a=b

In XCODE, use Main. Storyboard to pull the control and implement events (Swift language). xcodestoryboard tutorial In XCODE, how does one pull the control in Main. Storyboard and implement a simple effect? I have just been familiar with the Swift language, and I am still unfamiliar with IDE operations. If I don't understand it, I will refer to my previous article

Some basic attributes that need to be instantiated can be defined in the protocol. here, let's take a look at the protocol (protocol) tutorial in Swift. For more information, see I. INTRODUCTION The protocol defines some attributes and methods. Their functions are similar to abstract classes in Java. the types in Swift comply with the protocol to implement some

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

This 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 (full name: JavaScript Object Notation) is a common method of transmitting data in Web services, and JSON is very popular because it is easy to use and readable.Here is a snipp

Swift development Tutorial: Using Generics to facilitate the loading process of xib, swiftxib Swift development tutorials facilitate the xib loading process with generics. /// UIView + Extension. swift // BasicSwift /// Created by CoderZYWang on. // Copyright©2017 hc. All rights reserved. // import UIKit // load the x

VM10 Install Mac OS X 10.9.3 and update to Mac OS X 10.10 so that your windows can also play swift. Recently WWDC released the ultimate big trick--the new programming language Swift (SWIFT), which led to a big wave of program ape onlookers and eager.Of course, 工欲善其事, its prerequisite, so for those who do not have a Mac and want to taste the small partners must be

Import FOUNDATION//4, compound assignment operator var a = 1a + = 2//unary decrement operator (a numeric value before a symbol-called unary minus operator) let three = 3let Minusthree =-three//minusthree = -3let Plusthree =-minusthree//plusthree = 3//unary plus operator (unary plus operator (+) return value, no change) let Minussix = 6let Alsominussix = +minussix Alsominussix = 6//6, ternary conditional operator//Special NOTE: three-mesh operator (?) There must be at least one space in front of

General-Purpose StoryboardThe universal Stroyboard file is the first step toward a bright avenue for adaptive layout. Adapting the ipad and iphone layouts in a storyboard file is no longer a dream in iOS8. Instead of creating different storyboard files for different sizes of Apple mobile devices, we don't have to synchronize the contents of several storyboard files. This is really a wonderful thing.We open Xcode and create a new project:Select Ios\application\single View application to create a

Set Fillet buttonButton . Layer . bordercolor = Uicolor . Whitecolor (). Cgcolor ;Button. Layer . BorderWidth = 2;Button. Layer . Cornerradius = +;Set rounded border TextViewInputtextview . Layer . bordercolor = Uicolor (red:60/255, green:40/255, blue:129/255, alpha:1). Cgcolor ;Inputtextview . Layer . BorderWidth = 1;Inputtextview . Layer . Cornerradius = +; Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Say less nonsense, directly on the code:var Barsanim = Uiimageview (frame:self.view.frame);Barsanim . animationimages = Nsarray () as [anyobject]; barsanim. animationimages ?. Append (UIImage(named:"wave_000")!); barsanim. animationimages ?. Append (UIImage(named:"wave_001")!); barsanim. animationimages ?. Append (UIImage(named:"wave_002")!); barsanim. animationimages ?. Append (UIImage(named:"wave_003")!); barsanim. animationimages ?. Append (UIImage(named:"wave_004")!); barsanim. anim

Swift development tutorial -- Implementation of UITableView error does not conform to protocol 'uitableviewdatasource ', swiftprotocol Through practice, if we implement all the three protocol methods below, no error will be reported. Also note that! .Func tableView (tableView: UITableView, numberOfRowsInSection section: Int)-> Int { } Func tableView (tableView: UITableView, cellForRowAtIndexPath indexPat

Optional chainOriginal blog, reproduced please indicate the sourceMy blog AddressHttp://blog.csdn.net/hello_hwcAn optional chain provides an optional way to access an object's properties, methods, subscript scripts, and the return value of an optional chain must be an optional type.Merit: Substitution forced parsing (symbol!) , such as instance.location!. y), resulting in an execution-time error due to forced resolution of nil valuesMy experience: For a chain call, for example instance. Frame.or

Through practice, if the following three protocol methods are implemented, it will not be an error. Also need attention! The problem.func TableView (Tableview:uitableview, Numberofrowsinsection section:int), int{ }func TableView (Tableview:uitableview, Cellforrowatindexpath indexpath:nsindexpath), uitableviewcell{ }func TableView (Tableview:uitableview, Didselectrowatindexpath indexpath:nsindexpath) {Tableview.deselectrowatindexpath (Indexpath, Animated:true)}

"; str.drawatpoint (CGPointMake (100, , withattributes:nil); //Picture cgcontextsetshadow (Context,cgsizemake (3,3), ten) varimg:uiimage=uiimage ( named: "8")!; nBsp;img.drawatpoint ( Cgpointmake (50,250)); //cgcontextdrawimage (context, CGRectMake (100,NBSP;250,NBSP;100,NBSP;100), IMG. Cgimage) Cgcontextsetshadow (Context,cgsizemake (0,0), 0) //Using path Paint letp1:cgmutablepathref=cgpathcreatemutable (); cgpathmovetopoint (p1,nil,50,250) cgpathadDlinetopoint (p1,nil,50,350) cgcontextad

I recorded the swift rookie introduction, welcome everyone to shoot bricks, there is any problem to leave a message here.Main content:Constants and variablesGazeSemicolonIntegerFloating point numberType safety and type determinationNumeric type literalNumeric type conversionsType aliasesBoolean valueMeta-groupOptions availableAssertionVideo address:Baidu Network disk: Http://pan.baidu.com/s/1mgkJ6TqPotato: http://www.tudou.com/programs/view/nZPgYV9Hqz

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

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