Developing iOS apps with Swift

Swift Programming in

iOSDeveloping Apps using Swift

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

iOS 8- New Features

Why Swift?

What Apple saysFast - 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

The announcement of Swift got mixed reactions

What developers say

Show me the code!

Some key pointsDeclaration 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)

//variablesvar name: String = "Jane Doe"var year: Int = 2014var isFast: Bool = true

//Data type detectionname = "John Doe"year = 2016isFast = false

//Data type detectionvar name = "Jane Doe"var year = 2014var isFast = true

//constants

let name: String = "Jane Doe"

let year: Int = 2014

let isFast: Bool = true

//These will give an error

name = "John Doe"

year = 2016

isFast = false

Constants

let hello = "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

String Operations

//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]

Arrays and Dictionaries

//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

Accessing Collections

//Functions return more 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)")

Tuples

//if statementsif val == 0 { //Some code here} else if val == 1 { //Some code here} else { //Some code here}

//switch casesswitch 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 with where clause and tuplesswitch rgb { ... case let (r,g,b) where r==g && g==b: println("GREY"); default: println ("colored");}

//while loopwhile !finished {//Some code here}

//for loop and for infor 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 a project 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 lot more to Swift

Classes and structures, Protocols

Optional and non-optional parameters

Properties and methods

Getters and Setters

Property Observers

Closures

Designated and convenience initializers

Labeled statements

Lazy stored properties

Downcasting

Class methods

Extensions

There’s a lot more to Swift

Mapping Obj-C to Swift- 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)

References

https://developer.apple.com/library/prerelease/ios/documentation/Swift/Conceptual/Swift_Programming_Language/

http://www.raywenderlich.com/74438/swift-tutorial-a-quick-start

https://www.bloc.io/swiftris-build-your-first-ios-game-with-swift

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