Swift Class & Hackday

Some introductory concepts lead to a group building exercise to fix Apple's Swift templates and build a To-Do list app in the process.

Source for the final app can be found here: https://github.com/jpsim/SwiftClassTodo

Source for this talk can be found here: https://github.com/jpsim/talks

Transcript

1. SWIFT CLASS + HACKDAY
2. The set up
3. THE SETUP Xcode6-Beta3
4. WHO AM I?
5. JP SIMARD @SIMJP REALM.IO
6. TODAY !
7. CLASS 1. LEARN ABOUT SWIFT 2. BUILD AN APP 3. QUESTIONS
8. WHY SWIFT > OBJC? ▸ Type safety & inference ▸ Closures ▸ Tuples ▸ Super-Enums ▸ Functional programming ▸ Generics
9. Q: WHAT DOES IT LOOK LIKE?
10. TYPE SAFETY & INFERENCE let anInt = 3 let aFloat = 0.1416 var pi = anInt + aFloat // Compile warning pi = 3 + 0.1416 // Compiles: number literals are untyped LIKE RUST & SCALA
11. CLOSURES func backwards(s1: String, s2: String) -> Bool { return s1 > s2 } sort(["b", "a"], backwards) // => ["a", "b"] SWIFT CLOSURES ! OBJC BLOCKS
12. TUPLES let http404Error = (404, "Not Found") LIKE HASKELL & SCALA
13. SUPER-ENUMS* *OK, NOT EXACTLY THE CORRECT TECHNICAL TERM
14. enum Suit { case Spades, Hearts, Diamonds, Clubs func simpleDescription() -> String { switch self { case .Spades: return "Spades" case .Hearts: return "Hearts" case .Diamonds: return "Diamonds" case .Clubs: return "Clubs" } } }
15. FUNCTIONAL PROGRAMMING let numbers = [1, 5, 3, 12, 2] numbers.map { (number: Int) -> Int in return 3 * number } // => [3, 15, 9, 36, 6] numbers.filter {$0 % 2 == 0} // => [12, 2] LIKE HASKELL, SCALA & MANY OTHERS
16. GENERICS LIKE... UH... EVERY MODERN LANGUAGE!
17. // Reimplement the Swift standard // library's optional type enum OptionalValue<T> { case None case Some(T) } var maybeInt: OptionalValue<Int> = .None maybeInt = .Some(100) // Specialized Array var letters: [Array] letters = ["a"]
18. Q: WHAT HAPPENED TO MY BELOVED *
19. Q: WHAT HAPPENED TO MY BELOVED *? ▸ concepts are still there: reference types and value types ▸ pointers still exist to interact with C APIs: UnsafePointer<T>, etc.
20. Q: WHAT HAPPENED TO MY BELOVED *? C APIS ARE STILL USABLE import Foundation import Security let secret = "Top Secret".dataUsingEncoding(NSUTF8StringEncoding) let dict = [kSecClass as String: kSecClassGenericPassword, kSecAttrService as String: "MyService", kSecAttrAccount as String: "Some Account", kSecValueData as String: secret] as NSDictionary let status = SecItemAdd(dict as CFDictionaryRef, nil)
21. JAZZY
     GITHUB.COM/REALM/JAZZY A SOULFUL WAY TO GENERATE DOCS FOR SWIFT & OBJECTIVE-C
22. LINKS () ▸ Official Swift website ▸ The Swift Programming Language Book ▸ WWDC Videos ▸ WWDC Sample Code ▸ Xcode 6 (and other resources) Free Apple Developer Account Required
23. LINKS (!) ▸ This talk: github.com/jpsim/talks ▸ Jay Freeman's AltConf talk: debugging your (Swift) apps with cycript ▸ ObjC/Swift doc generator: github.com/realm/jazzy ▸ Evan Swick: Inside Swift ▸ Swift on StackOverflow
24. LET'S BUILD A TO-DO APP!
25. THANK YOU!
26. Hackday().questions?.askThem!
27. Hackday().questions?.askThem! JP SIMARD, @SIMJP, REALM.IO