Although the signs were out there in the open, the introduction of Swift was one of the big surprises of WWDC 2014. In this talk, I've outlined the reasonings why a 30yo language is being phased out and the main improvements introduced in Swift as well as Xcode 6.

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

2. CuriosMinds, Brasov, Sept 18th 2014 Slide 2

3. CuriosMinds, Brasov, Sept 18th 2014 Slide 3

4. An Android, an iOS, a Blackberry and a
Windows Mobile developer walk into a bar…
CuriosMinds, Brasov, Sept 18th 2014 Slide 3

5. An Android, an iOS, a Blackberry and a
Windows Mobile developer walk into a bar…
The barman looks at them & says…
CuriosMinds, Brasov, Sept 18th 2014 Slide 3

6. An Android, an iOS, a Blackberry and a
Windows Mobile developer walk into a bar…
The barman looks at them & says…
Gee, it must be in town
CuriosMinds, Brasov, Sept 18th 2014 Slide 3

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

8. To swiftly go where no
other language has
gone before

9. Good artists copy,
Real artists steal

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

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

12. Yet !

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

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

15. CuriosMinds, Brasov, Sept 18th 2014 Slide 1 2

16. CuriosMinds, Brasov, Sept 18th 2014 Slide 1 2

17. CuriosMinds, Brasov, Sept 18th 2014 Slide 1 3

18. CuriosMinds, Brasov, Sept 18th 2014 Slide 1 3
#freeJonyIve

19. CuriosMinds, Brasov, Sept 18th 2014 Slide 1 4

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

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

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

30. Why?

31. Why?
What?

32. Why?
What?
When?

33. Why?
What?
When?
How?

34. Why?

35. CuriosMinds, Brasov, Sept 18th 2014 Slide 2 4

36. CuriosMinds, Brasov, Sept 18th 2014 Slide 2 5
AAPL

37. CuriosMinds, Brasov, Sept 18th 2014 Slide 2 6
Products

38. CuriosMinds, Brasov, Sept 18th 2014 Slide 2 7
Software

39. CuriosMinds, Brasov, Sept 18th 2014 Slide 2 8
App Stores

40. CuriosMinds, Brasov, Sept 18th 2014 Slide 2 9

41. Apple needs developers

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

43. ‣ 30 year old language
‣ drastically different from other languages
‣ not entirely future-proof
CuriosMinds, Brasov, Sept 18th 2014 Slide
32
Objective-C

44. What?

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

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

47. Swift

48. CuriosMinds, Brasov, Sept 18th 2014 Slide
Objective-C without the C
36
Swift

49. CuriosMinds, Brasov, Sept 18th 2014 Slide
Objective-C without the C
36
Swift
Objective-C is to Swift <=> cat is to cattle

50. Swift

51. Safety

52. Safety - constants vs variables
CuriosMinds, Brasov, Sept 18th 2014 Slide 3 9

53. Safety - constants vs variables
CuriosMinds, Brasov, Sept 18th 2014 Slide 3 9
let theAnswer = 42

54. Safety - constants vs variables
CuriosMinds, Brasov, Sept 18th 2014 Slide 3 9
let theAnswer = 42
var numberBooks = 1

55. Safety - constants vs variables
CuriosMinds, Brasov, Sept 18th 2014 Slide 3 9
let theAnswer = 42
var numberBooks = 1
var numberBooks: Int = 1

56. Safety - no implicit conversion
CuriosMinds, Brasov, Sept 18th 2014 Slide 4 0

57. Safety - no implicit conversion
CuriosMinds, Brasov, Sept 18th 2014 Slide 4 0
var numberBooks = 1

58. Safety - no implicit conversion
CuriosMinds, Brasov, Sept 18th 2014 Slide 4 0
var numberBooks = 1
numberBooks = 2.5

59. Safety - no implicit conversion
CuriosMinds, Brasov, Sept 18th 2014 Slide 4 0
var numberBooks = 1
numberBooks = 2.5 ❗️

60. Safety - no implicit conversion
CuriosMinds, Brasov, Sept 18th 2014 Slide 4 0
var numberBooks = 1
numberBooks = 2.5 ❗️
numberBooks = Int(2.5)

61. Safety - no implicit conversion
CuriosMinds, Brasov, Sept 18th 2014 Slide 4 0
var numberBooks = 1
numberBooks = 2.5 ❗️
numberBooks = Int(2.5) ✔

62. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 1
Safety - switch
switch index {
case 1:
println("first")
case 2, 3:
println("second or third")
case 4...10:
println("top 10")
default:
println("others...")
}

63. New idioms

64. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 3
Tuples

65. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 3
Tuples
let http404Error = (404, "Not Found")

66. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 3
Tuples
let http404Error = (404, "Not Found")
let x = 1
let y = 2
let point = (x, y)

67. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 3
Tuples
let http404Error = (404, "Not Found")
let x = 1
let y = 2
let point = (x, y)
point.0

68. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 3
Tuples
let http404Error = (404, "Not Found")
let x = 1
let y = 2
let point = (x, y)
point.0
let origin = (x: 200, y: 100)
origin.y

69. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 4
Tuples

70. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 4
Tuples
// Original
var fibonacci = 1
var prev = 0
while fibonacci < 100 {
var prev_tmp = fibonacci
fibonacci += prev
prev = prev_tmp
println(fibonacci)
}

71. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 4
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)
}

72. Functions as
1st class citizens

73. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 6
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

74. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 6
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

75. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 6
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

76. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 6
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

77. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 6
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
greetingAt(11)("Paul")
greetingAt(14)("Paul")

78. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 6
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
greetingAt(11)("Paul")
greetingAt(14)("Paul")
"Good morning Paul”
"Good afternoon Paul"

79. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 7
Closures

80. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 7
Closures
func greetWithMessage(name: String, message: (String) -> String) -> String
{
return message(name);
}

81. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 7
Closures
func greetWithMessage(name: String, message: (String) -> String) -> String
{
return message(name);
}
greetWithMessage("Paul",
{ (name: String) -> String in
return "Good morning (name)"
}
)

82. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 7
Closures
func 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)"
})

83. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 7
Closures
func 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)"
}

84. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 7
Closures
func 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") { return "Good morning ($0)" }

85. CuriosMinds, Brasov, Sept 18th 2014 Slide 4 8

86. Tools

88. Playgrounds

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

90. Module 01 Slide 5 3 Hello24 Ltd. (c) 2014
Empty Playground

91. Module 01 Slide 5 4 Hello24 Ltd. (c) 2014
Playground

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

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

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

95. Module 01 Slide 5 6 Hello24 Ltd. (c) 2014
Fibonacci

96. Module 01 Slide 5 7 Hello24 Ltd. (c) 2014
Fibonacci

97. Module 01 Slide 5 8 Hello24 Ltd. (c) 2014
Fibonacci

98. Module 01 Slide 5 9 Hello24 Ltd. (c) 2014
Playground - Timeline

99. Module 01 Slide 6 0 Hello24 Ltd. (c) 2014
Playgrounds

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

101. Module 01 Slide Hello24 Ltd. (c) 2014
‣ Interactive experience
‣ Immediate feedback
‣ Watch code progression through loops
‣ Easy way to
‣ prototype
‣ test snippets of code
60
Playgrounds

102. Module 01 Slide Hello24 Ltd. (c) 2014
‣ Interactive experience
‣ Immediate feedback
‣ Watch code progression through loops
‣ Easy way to
‣ prototype
‣ test snippets of code
‣ CAREFUL! Executed automatically.
60
Playgrounds

103. Swift REPL

104. Module 01 Slide 6 2 Hello24 Ltd. (c) 2014
REPL
Read–eval–print loop

105. Module 01 Slide 6 2 Hello24 Ltd. (c) 2014
REPL
Read–eval–print loop
$ which swift
/usr/bin/swift

106. Module 01 Slide 6 2 Hello24 Ltd. (c) 2014
REPL
Read–eval–print loop
$ 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

107. Module 01 Slide 6 3 Hello24 Ltd. (c) 2014
man swift

108. Module 01 Slide 6 4 Hello24 Ltd. (c) 2014
REPL

109. REPL
$ swift -v
…
<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift
Module 01 Slide 6 4 Hello24 Ltd. (c) 2014

110. REPL
$ swift -v
…
<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift
Module 01 Slide 6 4 Hello24 Ltd. (c) 2014

111. REPL
$ swift -v
…
<unknown>:0: error: the SDK 'MacOSX10.9.sdk' does not support Swift
Module 01 Slide 6 4 Hello24 Ltd. (c) 2014

112. Module 01 Slide 6 5 Hello24 Ltd. (c) 2014
REPL

113. Module 01 Slide 6 5 Hello24 Ltd. (c) 2014
REPL
$ swift -v

114. Module 01 Slide 6 5 Hello24 Ltd. (c) 2014
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"

115. Module 01 Slide 6 5 Hello24 Ltd. (c) 2014
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.

116. Module 01 Slide 6 6 Hello24 Ltd. (c) 2014
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

117. When?

118. ‣ 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
CuriosMinds, Brasov, Sept 18th 2014 Slide
68
Now!

119. CuriosMinds, Brasov, Sept 18th 2014 Slide 6 9
Resources

120. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 0
Resources

121. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 1
My Book
pa@h24.io

122. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 2

123. How?

124. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 4
Swift project

125. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 5
Bridging

126. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 6
Bridging

127. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 7
//
// 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
}
…
}

128. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 8

129. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 8

130. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 9

131. CuriosMinds, Brasov, Sept 18th 2014 Slide 7 9

132. Objective-C ➾ Swift

133. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 1
Fizz Buzz classic

134. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 1
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)

135. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 1
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”

136. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 2
Swift Fizz Buzz

137. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 2
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)

138. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 2
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)
“1”
“2”
“fizz”
“buzz”
“fizz”
“buzz”
“fizzbuzz”

139. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 3
Fizz Buzz - side by side
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)" }
})
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)"
}
})

140. Objective-C ➾ Swift

141. CuriosMinds, Brasov, Sept 18th 2014 Slide 8 5

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