iOS applications with Swift
Make swiftly iOS development
Telerik Academy Plus
Telerik Academy
http://academy.telerik.com
About Me
 Doncho Minkov
 Senior Technical Trainer
@ Telerik Software Academy
 Contestant in the Informatics
competitions
 Experience with Web and Mobile apps
 Proficient with JavaScript and .NET
 Email: doncho.minkov [at] telerik.com
 Blog: http://minkov.it
Table of Contents

Swift overview

Language syntax and specifics
 Variables, structures and optional values
 Control structures: if-else, switch, loops
 Functions as first-class objects, closures, etc…
 OOP: classes, protocols, enums, extensions
 Syntactic sugar: destructuring assignments

iOS applications with Swift
 Handling gestures on the UI
 Using graphics and animations
Swift Overview
What and Why?
Swift Overview
 Swift is an innovative new programming
language for Cocoa and Cocoa Touch
 Writing code is interactive and fun
 The syntax is concise yet expressive
 Apps run lightning-fast
 Swift can be used for creating brand-new iOS
and OS X apps
 Or to add features to applications written with
Objective-C
Swift Overview
 Swift was introduced at WWDC 2014 as the
"new way to create apps for iPhone and iPad"
 Objective-C without the C
 Descendant to Objective-C
 No pointers
 Functions as first-class objects
 Influenced from many modern languages:
 JavaScript, Objective-C, C#, Python, Scala, etc…
Swift Experiment Techniques
 Since Swift is pretty new and still
needs
exploring Apple has provided ways to
experiment the new features:
 REPL (Read Eval Print Loop)
 Run swift code from the Terminal
 Xcode interactive Playground
 Immediate code evaluation, while typing
Using the Swift REPL
 To use the REPL of Swift follow the steps:
1. Start Terminal.app
2. Type
$ swift
3. Type code directly inside the Terminal
4. The output is shown directly on the Terminal
 You can also
execute code from a swift file:
$ swift print-primes.swift
Using the Swift REPL
Live Demo
Using the Swift Playground

Apple has provided a Playground for
experimenting with Swift features inside Xcode
 Write code and receive immediate result
 Great for exploring Swift features and research
 Allows fast testing of features and syntax
Going to the
Playground
Live Demo
Swift Syntax and Specifics
Laying the groundwork
Swift Syntax Overview
 Swift syntax:
 Variables and contants
 Control structures
 If-else, loops, switch
 Data structures
 Arrays, dictionaries, sets
 Classes and structures
 Init functions, methods, properties, fields
 OOP
 Protocols, extensions, inheritance
Data types, Variables and
Constants
var and let, primitive and reference, functions
Data Types in Swift

Swift supports the common data types, coming
from Objective-C
 Int for creating integers numbers
 UInt for creating unsigned integer numbers
 Float, Double for floating-point numbers
 Bool for Boolean values
 [] for array, [Int] for array of integers

Swift supports both structures and classes
 Structures create primitive types
 Classes create reference types
Data Types, Variables
and Constants

Swift provides two keywords for creating
variables:
 let and var

var creates a mutable variable
 Its value can be changed any time
 The type can be provided or inferred

let creates immutable variable
 If the type is struct, its value cannot be changed
 If the type is object, it can be changed only
internally
Using let and var

Creating a variable of type integer:
 Using let
let numberOfCourses: Int = 15
numberOfCourses = 16 // compiler error
 Using var
var count :Int = 15
count++ //this is Ok
 Variable types are inferred
 The compiler will understand that you want Int
 Works with let and var
let numberOfCourses = 15
var count = 15
Using var and let
Live Demo
Defining Functions in Swift

Functions in Swift have the following syntax:
 Function returning void:
func printMessage(message: String) {
println(String(format: "Message: %@", message))
}
 Function returning integer:
func sum(x: Int, y: Int) -> Int {
return x + y
}
 Function with parameters put inside an array:
func sum(numbers: Int…) -> Int {
var sum = 0
for number in numbers { sum += number}
return sum
}
Functions in Swift
Live Demo
Control Flow Structures:
if-else and switch
 Swift supports the standard
control flow
structures:
if-else
switch
if condition {
//run code
}
else if condition2 {
//run other code
}
else {
//run third code
}
switch language {
case "Objective-C", "Swift":
println("iOS")
case "Java":
println("Android")
case "C#":
println("Windows Phone")
default:
println("Another platform")
}
If-else and Switch
Live Demo
Control Flow Structures: Loops
 Swift supports the standard
control flow
structures:
 for loop
for i in 0...11 {
//i gets the values from 0 to 11, inclusive
}
for i in 0..<11 {
//i gets the values from 0 to 10, inclusive
}
 while loop
while condition {
//run code
}
Swift Data Structures
Swift Data Structures

Swift has built-in arrays and dictionaries
 let creates immutable dictionary/array
 var creates mutable dictionary/array

Immutable arrays:
let numbers: [Int] = [1, 2, 3, 4, 5]
numbers[2] = -1 //compile error
numbers.append(6) //compile error

Mutable arrays:
var names: [String] = ["Doncho", "Ivaylo"]
names.append("Nikolay") //Doncho, Ivaylo, Nikolay
names.append("Pesho")
//Doncho, Ivaylo, Nikolay, Pesho
names[3] = "Evlogi"
//Doncho, Ivaylo, Nikolay, Evlogi

Same for dictionaries
Arrays and Dictionaries
Live Demo
Classes and Structures
Introducing the OOP principles in Swift
Swift Classes
 Swift is an OOP language
 Has classes, structures and protocols
class Square{
var x: Float
var y: Float
var side: Float
init(x: Float, y: Float, side: Float){
self.x = x
self.y = y
self.side = side
}
func calcArea() -> Float{
return self.side * self.side
}
}
Creating Simple Classes
Live Demo
Protocols in Swift

Protocols in Swift are pretty much the same as in
Objective-C
 Almost like interfaces in C# and Java
 They provide a public interface for the conforming
classes to implement
protocol Movable{
func moveToX(x: Int, y: Int)
func moveByDx(dx:Int, dy: Int)
}
class Shape: Movable{
func moveToX(x: Int, y: Int){
//implementation
}
func moveByDx(dx: Int, dy: Int){
//implementation
}
}
Protocols in Swift
Live Demo
UIKit Animations
UIKit Animations

A limited number of animatable properties

Custom animatable properties cannot be created

All animations are disabled by default

Animations are enabled only when using special
constructs
let view = UIView(frame: CGRectMake(x, y, w, h))
UIView.animateWithDuration( 1.0
animations: {
let frame = CGRectMake(x + 100,
y + 100,
w,
h)
view.frame = frame
});
UIKit Animations:
Animation Blocks

UIKit Animations with Animation Blocks
UIView.animateWithDuration( 1.0
delay: 1.0
options: UIViewAnimationOptions.CurveEaseIn
animations: {
let frame = CGRectMake(x + 100,
y + 100,
w,
h)
view.frame = frame
},
completion: {
view.alpha = 0.5
});
UIKit Animations
Live Demo
iOS Apps with Swift
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