To swiftly go where no OS has gone before

Swift & iOS
Paul Ardeleanu
pa@h24.io
@pardel
Copyleft 2014 me

CuriosMinds, Brasov, Sept 18th 2014 Slide 2

An Android, an iOS, a Blackberry and a
Windows Mobile developer walk into a bar…

The barman looks at them & says…

The barman looks at them & says…
Gee, it must be in town

To swiftly go where no
other language has
gone before

Good artists copy,
Real artists steal

Everything is a remix
https://www.flickr.com/photos/mugley/800999028/

The talk about that new
programming language
everyone talks about
but nobody really uses…

CuriosMinds, Brasov, Sept 18th 2014 Slide 1 2

#freeJonyIve

It’s all about the users
https://www.flickr.com/photos/wyogirl13/6455191187

It’s all about the users.
https://www.flickr.com/photos/wyogirl13/6455191187

AAPL

Products

Software

App Stores

‣ maximise the number of developers
CuriosMinds, Brasov, Sept 18th 2014 Slide
‣ keeping existing developers happy
31
2 more things…

‣ 30 year old language
‣ drastically different from other languages
‣ not entirely future-proof
32
Objective-C

LLVM & Clang
Apps For Good, London, June 29th 2012 Slide 3 4 Hello24 Ltd. (c) 2012

LLVM & Clang
gcc => llvm-gcc => llvm
Apps For Good, London, June 29th 2012 Slide 3 4 Hello24 Ltd. (c) 2012

Objective-C without the C
36
Swift

Objective-C without the C
36
Swift
Objective-C is to Swift <=> cat is to cattle

Safety - constants vs variables

let theAnswer = 42

let theAnswer = 42
var numberBooks = 1

let theAnswer = 42
var numberBooks = 1
var numberBooks: Int = 1

Safety - no implicit conversion

var numberBooks = 1

var numberBooks = 1
numberBooks = 2.5

var numberBooks = 1
numberBooks = 2.5 ❗️

var numberBooks = 1
numberBooks = Int(2.5)

var numberBooks = 1
numberBooks = Int(2.5) ✔

Safety - switch
switch index {
case 1:
println("first")
case 2, 3:
println("second or third")
case 4...10:
println("top 10")
default:
println("others...")
}

Tuples

Tuples
let http404Error = (404, "Not Found")

Tuples
let x = 1
let y = 2
let point = (x, y)

Tuples
let x = 1
let y = 2
let point = (x, y)
point.0

Tuples
let x = 1
let y = 2
let point = (x, y)
point.0
let origin = (x: 200, y: 100)
origin.y

Tuples

Tuples
// Original
var fibonacci = 1
var prev = 0
while fibonacci < 100 {
var prev_tmp = fibonacci
fibonacci += prev
prev = prev_tmp
println(fibonacci)
}

Tuples
// Original
var fibonacci = 1
var prev = 0
while fibonacci < 100 {
var prev_tmp = fibonacci
fibonacci += prev
prev = prev_tmp
println(fibonacci)
}
// tuples
var fibonacci_t = 1
var prev_t = 0
while fibonacci_t < 100 {
(prev_t, fibonacci_t) = (fibonacci_t, fibonacci_t + prev_t)
println(fibonacci_t)
}

Functions as
1st class citizens

Functions
func greetingAt(hour: Int) -> (String) -> String {
}
func morningGreeting(name: String) -> String {
return "Good morning (name)"
}
func afternoonGreeting(name: String) -> String {
return "Good afternoon (name)"
}
return hour < 12 ? morningGreeting : afternoonGreeting

Functions
}
}
}
greetingAt(11)("Paul")

Functions
}
}
}
"Good morning Paul”
"Good afternoon Paul"

Closures

Closures
func greetWithMessage(name: String, message: (String) -> String) -> String
{
return message(name);
}

Closures
{
}
greetWithMessage("Paul",
{ (name: String) -> String in
}
)

Closures
{
}
}
)
greetWithMessage("Paul", { name in
})

Closures
{
}
}
)
})
greetWithMessage("Paul") { name in
}

Closures
{
}
}
)
})
greetWithMessage("Paul") { name in
}
greetWithMessage("Paul") { return "Good morning ($0)" }

Module 01 Slide 5 2 Hello24 Ltd. (c) 2014
New Playground

Empty Playground

Playground

Fibonacci

Playground - Timeline

Playgrounds

Module 01 Slide Hello24 Ltd. (c) 2014
‣ Interactive experience
‣ Immediate feedback
‣ Watch code progression through loops
60
Playgrounds

‣ Easy way to
‣ prototype
‣ test snippets of code
60
Playgrounds

‣ Easy way to
‣ prototype
‣ test snippets of code
‣ CAREFUL! Executed automatically.
60
Playgrounds

REPL
Read–eval–print loop

REPL
$ which swift
/usr/bin/swift

REPL
$ which swift
/usr/bin/swift
$ swift -v
Swift version 1.0 (swift-600.0.51.3)
Target: x86_64-apple-darwin14.0.0
<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not
support Swift

man swift

REPL

REPL
$ swift -v
…
<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift

REPL

REPL
$ swift -v

REPL
$ swift -v
/Applications/Xcode-Beta.app/Contents/Developer/usr/bin/lldb "--repl=-target
x86_64-apple-darwin14.0.0 -target-cpu core2 -sdk /Applications/Xcode-
Beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
MacOSX10.10.sdk -color-diagnostics"

REPL
$ swift -v
/Applications/Xcode-Beta.app/Contents/Developer/usr/bin/lldb "--repl=-target
x86_64-apple-darwin14.0.0 -target-cpu core2 -sdk /Applications/Xcode-
Beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/
MacOSX10.10.sdk -color-diagnostics"
$ swift
Welcome to Swift! Type :help for assistance.

REPL
$ swift
Welcome to Swift! Type :help for assistance.
1> 1 + 2
$R0: Int = 3
2> "once upon a time"
$R1: String = "once upon a time"
3> $R1 + " there were ($R0) bears"
$R2: String = "once upon a time there were 3 bears"
4> println($R2)
once upon a time there were 3 bears

‣ iOS 8 released yesterday
‣ Swift is v.1.0 as of Sept 9th
‣ Xcode 6.0.1 released yesterday
‣ Apps written in Swift started being accepted on Sept 9th
68
Now!

Resources

My Book
pa@h24.io

Swift project

Bridging

//
// STDataObject.swift
//
import Foundation
import CoreData
class STDataObject: NSManagedObject {
@NSManaged var uuid: String?
@NSManaged var sync_uuid: String?
@NSManaged var is_active: NSNumber
class func managedObjectContext() -> NSManagedObjectContext? {
var appDelegate = UIApplication.sharedApplication().delegate
as AppDelegate
return appDelegate.managedObjectContext
}
…
}

Fizz Buzz classic

Fizz Buzz classic
let fizzBuzz = ({ (n: Int) -> String in
if( 0 == (n % 3 + n % 5)) { return "FizzBuzz" }
if( 0 == n % 3) { return "Fizz" }
if( 0 == n % 5) { return "Buzz" } else { return "(n)" }
})
fizzBuzz(1)
fizzBuzz(2)
fizzBuzz(3)
fizzBuzz(5)
fizzBuzz(9)
fizzBuzz(10)
fizzBuzz(15)

Fizz Buzz classic
if( 0 == n % 3) { return "Fizz" }
})
fizzBuzz(1)
fizzBuzz(2)
fizzBuzz(3)
fizzBuzz(5)
fizzBuzz(9)
fizzBuzz(10)
fizzBuzz(15)
“1”
“2”
“fizz”
“buzz”
“fizz”
“buzz”
“fizzbuzz”

Swift Fizz Buzz

Swift Fizz Buzz
let swiftFizzBuzz = ({ (aNumber: Int) -> String in
switch (aNumber % 3, aNumber % 5 ) {
case (0, 0):
return "FizzBuzz"
case (0, _):
return "Fizz"
case (_, 0):
return "Buzz"
default:
return "(aNumber)"
}
})
swiftFizzBuzz(1)
swiftFizzBuzz(2)
swiftFizzBuzz(3)
swiftFizzBuzz(5)
swiftFizzBuzz(9)
swiftFizzBuzz(10)
swiftFizzBuzz(15)

Swift Fizz Buzz
case (0, 0):
return "FizzBuzz"
case (0, _):
return "Fizz"
case (_, 0):
return "Buzz"
default:
return "(aNumber)"
}
})
swiftFizzBuzz(1)
swiftFizzBuzz(2)
swiftFizzBuzz(3)
swiftFizzBuzz(5)
swiftFizzBuzz(9)
swiftFizzBuzz(10)
swiftFizzBuzz(15)
“1”
“2”
“fizz”
“buzz”
“fizz”
“buzz”
“fizzbuzz”

Fizz Buzz - side by side
if( 0 == n % 3) { return "Fizz" }
})
case (0, 0):
return "FizzBuzz"
case (0, _):
return "Fizz"
case (_, 0):
return "Buzz"
default:
return "(aNumber)"
}
})

Thank you!
Paul Ardeleanu
pa@h24.io
@pardel
Copyleft 2014 me

To swiftly go where no OS has gone before

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