Download pdf - To swiftly go where no OS has gone before

Copyleft 2014 me

Swift & iOS

Paul Ardeleanu

[email protected] @pardel

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

Copyleft 2014 me

Swift & iOS

Paul Ardeleanu


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…

Yet !

Copyleft 2014 me

Swift & iOS

Paul Ardeleanu


Everything is a remix

https://www.flickr.com/photos/mugley/800999028/





#freeJonyIve


It’s all about the users

https://www.flickr.com/photos/wyogirl13/6455191187

It’s all about the users.


It’s all about the users.


Why?

Why?What?

Why?What?When?

Why?What?When?How?

Why?



AAPL


Products


Software


App Stores


Apple needs developers

CuriosMinds, Brasov, Sept 18th 2014 Slide

‣ maximise the number of developers

‣ keeping existing developers happy

31

2 more things…


‣ 30 year old language

‣ drastically different from other languages

‣ not entirely future-proof

32

Objective-C

What?

Apps For Good, London, June 29th 2012 Slide Hello24 Ltd. (c) 201234

LLVM & Clang

Apps For Good, London, June 29th 2012 Slide Hello24 Ltd. (c) 201234

LLVM & Clang

gcc => llvm-gcc => llvm

Swift


Objective-C without the C

36

Swift


Objective-C without the C

36

Objective-C is to Swift <=> cat is to cattle

Swift

Swift

Safety


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...") }

New idioms


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


}



Functions


}



Functions


}



Functions


}


greetingAt(11)("Paul")



Functions


}




"Good morning Paul”

"Good afternoon Paul"


Closures


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



greetWithMessage("Paul", { (name: String) -> String in return "Good morning \(name)" } )




greetWithMessage("Paul", { name in return "Good morning \(name)" })





greetWithMessage("Paul") { name in return "Good morning \(name)" }





greetWithMessage("Paul") { name in return "Good morning \(name)" }

greetWithMessage("Paul") { return "Good morning \($0)" }


Tools

Playgrounds

Module 01 Slide Hello24 Ltd. (c) 201452

New Playground


Empty Playground


Playground


Playground


Playground


Playground


Fibonacci


Fibonacci


Fibonacci


Playground - Timeline


Playgrounds


‣ 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

Swift REPL


REPLRead–eval–print loop


REPL

$ which swift

/usr/bin/swift

Read–eval–print loop


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

Read–eval–print loop


man swift


REPL


REPL$ swift -v

…

<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift


REPL$ swift -v

…



REPL$ swift -v

…



REPL


REPL$ swift -v


REPL$ swift -v

Swift version 1.1 (swift-600.0.54.4) Target: x86_64-apple-darwin14.0.0 /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

Swift version 1.1 (swift-600.0.54.4) Target: x86_64-apple-darwin14.0.0 /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

When?


‣ 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


Resources


My Book

[email protected]


How?


Swift project


Bridging


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 }

…

}





Objective-C ➾ Swift


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

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)

“1”“2”“fizz”“buzz”“fizz”“buzz”“fizzbuzz”


Swift Fizz Buzz


Swift Fizz Buzzlet 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 Buzzlet 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)

“1”“2”“fizz”“buzz”“fizz”“buzz”“fizzbuzz”


Fizz Buzz - side by sidelet 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)" } })

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)" } })

Objective-C ➾ Swift


Copyleft 2014 me

Thank you!

Paul Ardeleanu
