xcode swift tutorial

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

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

str1 = "Hello" var str2 = "World" var str = str1 + str2var str2 = "\ (str1) HWC and the \ (str2)"//hello HWC and the world6 uppercase and lowercase conversionsStr.uppercasestring//hello World str.lowercasestring//hello World7 prefix suffix equalsBool Hasprefix (prefix:string)Bool Hassuffix (suffix:string)var str = "Hello HWC" str.hasprefix ("Hello")//truestr.hassuffix ("123")//falsevar str1 = "Jack"if str = = str1{println ("Equal")}8 processing substringsvoid Insert (NEWELEMEMT:CHARACTER,ATIND

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)}

http://www.imooc.com/learn/127"Fun to Swift" Web tutorial notes, you have updated according to the syntax of 2.1.I.1. Learn and familiarize yourself with the features of swift language through playground.2. A tuple declaration can have a name for each meta, which can then be used. Accessvar t= (x:1, y:2, Z:"hi") // var t: (int,int,string) var (a,_,_) =t //

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

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")

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