RubyMotion talk by Marc Rendl Ignacio during the October 2012 PHRUG (Philippine Ruby User Group) meetup held at the AELOGICA office.

1. RubyMotion
Making iOS apps in Ruby

2. @pd_i

4. Prerequisites

5. Prerequisites
Ruby MVC
Objective-C*
*optional

6. What is
RubyMotion?

9. Ruby toolchain for iOS

10. Author:
Laurent Sansonetti
(MacRuby)

11. 1.9
compliant

12. Something
Objective-C
Objective-C Runtime
Foundation Framework
iOS SDK

13. RubyMotion Objective-C
Objective-C Runtime
Foundation Framework
iOS SDK

14. Different...

15. ...but the same
Gary
Oldman

16. Observations

17. Objects
RubyMotion
Objective-C

18. RubyMotion Objects
# Ruby
"PHRUG".class.ancestors
=> [String, Comparable, Object, Kernel,
BasicObject]
# RubyMotion
"PHRUG".class.ancestors
=> [String, NSMutableString, NSString,
Comparable, NSObject, Kernel]

19. RubyMotion Objects
# RubyMotion
Object == NSObject
=> true

20. Objective-C
RubyMotion Methods

21. RubyMotion Methods
# Objective-C / Cocoa
NSString *string =
[[NSString alloc] initWithString:@"PhRuG"];
# RubyMotion
string =
NSString.alloc.initWithString "PhRuG"

22. RubyMotion Methods
# Objective-C / Cocoa
NSString *string =
[[NSString alloc] initWithString:@"PhRuG"];
[string uppercaseString] => "PHRUG";
# RubyMotion
string =
NSString.alloc.initWithString "PhRuG"
string.uppercaseString => "PHRUG"

23. RubyMotion Methods
# Objective-C / Cocoa
NSString *string =
[[NSString alloc] initWithString:@"PhRuG"];
[string uppercaseString] => "PHRUG";
# RubyMotion
string =
NSString.alloc.initWithString "PhRuG"
string.uppercaseString => "PHRUG"
# we can still use ruby methods!
string.upcase => "PHRUG"

24. Named
Parameters

25. Named Parameters
# Objective-C, named parameters
[string drawAtPoint: point withFont:font]
# RubyMotion
string.drawAtPoint(point, withFont:font)
# using send
string
.send(:"drawAtPoint:withFont:", point, font)

26. Named Parameters
# Objective-C, named parameters
[string drawAtPoint: point withFont:font]
# RubyMotion
string.drawAtPoint(point, withFont:font)
# using send
string
.send(:"drawAtPoint:withFont:", point, font)

27. If they're the
same...

28. ... why use it?

29. Good
Stuff

30. Power

31. Editor
+
Terminal

32. Rake

33. rake simulator

34. rake device

35. rake spec

36. Testing
(MacBacon)

37. Garbage
Collection

38. REPL
(read-eval-print loop)

39. DSLs
(domain specific languages)

40. Cocoapods

41. Disadvantages

42. Disadvantages
● Cost
○ $199.99 with 1 year updates
○ $99 per year to continue updates
● Most resources are in Objective-C
● Not an excuse to not learn Objective-C
● No RubyMotion Book (yet)

43. Demo Time!

44. Questions?

45. Resources
● rubymotion.com
● rubymotion.com/developer-center
● slideshare.net/markvilla/macruby-rubymotion-
madridrb-may-2012-13154591
● http://www.slideshare.net/clayallsopp/preview-
unicorns-magic-and-better-apps-with-rubymotion [for
the Gary Oldman metaphor :) ]

46. Images
● http://rubyidentity.org/
● http://www.rubymotion.com/press/
● developer.apple.
com/technologies/mac/cocoa.html
● cocoapods.org

47. Thanks!

48. Marc Ignacio
twitter: @pd_i github: @padi