Developing iOS apps with Swift

Swift
Programming in
DevelopinigO AppSs using Swift

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

What developers say
The announcement of Swift got mixed
reactions

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
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

String Operations
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

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 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)")

//if statements
if val == 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 with where 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 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

There’s a lot more to
Swift
Designated and convenience initializers
Labeled statements
Lazy stored properties
Downcasting
Class methods
Extensions

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/http://www.raywenderlich.com/74438/swift-tutorial-
a-quick-start
https://www.bloc.io/swiftris-build-your-first
-ios-game-with-swift

What to get your iOS
app developed with
Swift?
Contact us for a FREE 15-minute consultation
http://newgenapps.com/contact/
Skype: lata.nga / newgenapps
Phone: +1 415 800 4445

Developing iOS apps with Swift

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