iOS 8- New Features App Extensions - for sharing, photo editing, storage, custom keyboards (yay!) and much more Touch ID - forget registration and login, Touch ID authentication is here Games - many improvements to SpriteKit, SceneKit, OpenGL and a new framework Metal - for high performance in games Health Kit - a new framework for managing health-related info. Make way for revolutionary health apps
iOS 8- New Features Home Kit - communicate with connected devices (you don’t need to go to the switch now) Handoff - seamless continuity of activities across devices Photos - there is so much more you can do with Photos now And much more Sharing documents between apps More inclusive notifications Better search
What Apple says Fast - performance wise, Swift is much faster than Objective-C Modern - borrows from Haskell, Ruby, Javascript - skill barrier greatly lowered Interactive - a Playground allows programmers to experiment with Swift code and see results immediately - no building and running
Some key points Declaration and implementation are in the same file (no .h and .m files) Project size is largely reduced with Swift Swift auto-detects data types The code does not use semi-colons Braces are compulsory for if-else conditions
Variables (and type inference) //variables var name: String = "Jane Doe" var year: Int = 2014 var isFast: Bool = true //Data type detection name = "John Doe" year = 2016 isFast = false //Data type detection var name = "Jane Doe" var year = 2014 var isFast = true
Constants //constants letname: String = "Jane Doe" let year: Int = 2014 let isFast: Bool = true //These will give an error name = "John Doe" year = 2016 isFast = false
String Operations lethello = "Hello" let world = "World" let firstString = hello + " " + world //Will print Hello World let a = 4, b = 5 println ("(a) * (b) = (a * b)") //Will print 4 * 5 = 20 isFast = false
Arrays and Dictionaries //Typed arrays var typedList: String[] = ["Yes", "No", "Cancel"] typedList += ["OK"] //typedList - Yes, No, Cancel, OK //Mixed objects in an array var mixedList: String[] = ["India", 40.5, 3, false] //Dictionaries var comments = ["article1":4, "article2":6, "article3":0] comments["article4"] = 5; comments += ["article5":2, "article6":8]
Accessing Collections //Arrays typedList.insert("Later", atIndex:0) //typedList - Later, Yes... typedList.removeAtIndex(0) //typedList - Yes, No... typedList.append("Later") //typedList - Yes, No...Later typedList.removeLast() //Dictionaries let numberOfComments = comments["article4"] //will be 5
Tuples //Functions returnmore than 1 values as tuples let result = (404, "Not found") let code = result.0 //will be 404 let status = result.1 //will be “Not found” //Defining functions func getStatus (var1:String, var2:String)->(Int, String) //Calling function var result:(code:Int, status:String) = self.getStatus(var1: "googleegoo.com", var2: "http") print("Result is (result.code) - (result.status)")
//if statements ifval == 0 { //Some code here } else if val == 1 { //Some code here } else { //Some code here } //switch cases switch val { case 1, 3, 5: println ("odd"); case: 2, 4, 6: println ("even"); case: 7...9: println ("7, 8, 9"); default: println ("other"); } Conditions
Conditions //switch withwhere clause and tuples switch rgb { ... case let (r,g,b) where r==g && g==b: println("GREY"); default: println ("colored"); } //while loop while !finished {//Some code here} //for loop and for in for var i=0; i<10; i++ {//Some code here} for num in 1...10 {//iterate from 1 to 10} for num in 1..10 {//iterate from 1 to 9, not 10 - just 2 dots here}
Playground Run aproject without compiling Run as you type (has its disadvantages) Error symbols show as you type your code Quick look button shows graphical display for a piece of code
There’s a lotmore to Swift Classes and structures, Protocols Optional and non-optional parameters Properties and methods Getters and Setters Property Observers Closures
There’s a lotmore to Swift Designated and convenience initializers Labeled statements Lazy stored properties Downcasting Class methods Extensions
Mapping Obj-C toSwift - changes to func + changes to class func # define changes to let #pragma changes to //MARK : No init and initWith Change complex macros to functions let myCustomColor = UIColor(red:0.5,green:0.5,blue:0.0,alpha:1.0)
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