RubyMotion allows developers to build OS X and iOS applications using the Ruby programming language. It was created by Laurent Sansonetti after initially working on MacRuby inside Apple. RubyMotion uses a static compiler to generate optimized machine code from Ruby code and allows Ruby developers to access Apple's Cocoa APIs. It provides a similar programming model to Objective-C development but uses Ruby syntax. RubyMotion applications can be distributed to the App Store.

1. RubyMotion
Programming OS X and iOS apps with Ruby

2. Hi
I’m @MarkVillacampa

3. MacRuby
Started by Laurent Sansonetti inside Apple
Initial 0.1 release in March 2008
Goal: Write OS X applications in Ruby
without any performance loss

4. MacRuby
An implementation of the Ruby language that
runs on top of the Objective-C runtime and
garbage collection
Based on Ruby 1.9
Uses LLVM
Eventually "sunsetted" by Apple :(

5. RubyMotion
Commercial product.
Write OS X and iOS applications using Ruby
Laurent Sansonetti left Apple to work on it.
Released May 3rd, 2012
Awesome community!

6. RubyMotion
Built on top of MacRuby
Uses a new LLVM-based static compiler that
generates optimized machine code
Memory model similar to Objective-C ARC
Based on Rake
http://www.rubymotion.com/

7. Cocoa
Apple's native object-oriented API for OS X
and iOS
Includes a lot of different libraries
Very mature (originally developed at
NeXTSTEP in the 80s)

9. Key concepts:
RubyMotion objects are Objective-C objects
>> "Hello Betabeers!".class.ancestors
=> [String, NSMutableString, NSString, Comparable, NSObject,
Kernel]

10. Key concepts:
Can use Ruby & Cocoa methods
>> "Hello Madridrb!".upcase ← Ruby
=> "HELLO MADRIDRB!"
>> "Hello Madridrb!".uppercaseString ← Cocoa
=> "HELLO MADRIDRB!"

11. Key concepts:
New method syntax: named parameters
>> NSDictionary.alloc.initWithObjects(["foo"], forKeys:
["bar"])
=> {"foo"=>"bar"}

12. 1. The syntax

13. Objective-C:
Ruby:
a = {"foo" => ["bar", "baz"], "oof" => 2}
NSMutableDictionary *dict = [NSMutableDictionary dictionary];
[dict setObject:[NSArray arrayWithObjects:@"bar", @"baz"]
forKey:@"foo"];
[dict setObject:[NSNumber numberWithInt:2] forKey:@"oof"];

14. 2. No Xcode

16. HelloMadridrb
app
app_delegate.rb
resources
spec
main_spec.rb
.gitignore
Rakefile
$ motion create MotionBetabeers
.rb files
Main delegate
Images, Sounds, .xib files
Tests
Configuration file

17. 3. Gems

18. http://rubymotion-wrappers.com
Can't use CRuby gems ('require' is not allowed)
Many wrappers and libraries specifically created
for Rubymotion and Cocoa:
https://github.com/rubymotion/motion-kit
E.g.: Motion-Kit

19. 4. TDD

20. Bacon
http://www.rubymotion.com/developer-center/articles/testing/
Rspec syntax
Helpers to test touch UI in iOS
describe "Application" do
before do
@app = UIApplication.sharedApplication
end
!
it "has one window" do
@app.windows.size.should == 1
end
end

21. 6. Interactive Console
(REPL)

22. Holding and clicking in a
UI element assigns that
element to the self variable in
the console

23. 7. CocoaPods

24. CocoaPods is like RubyGems but for Ojective-C
projects.
$ sudo gem install cocoapods
$ pod setup
$ sudo gem install motion-cocoapods
Choose a pod:
https://github.com/CocoaPods/Specs
Edit Rakefile:
require 'motion-cocoapods'
!
Motion::Project::App.setup do |app|
# ...
app.pods do
dependency 'Facebook-iOS-SDK'
end
end

25. 8. Production Ready

26. http://www.rubymotion.com/apps/
Hundreds of apps in the AppStore
Used at Cabify since 2012

27. http://www.rubymotion.com/developer-center/

28. Thanks
www.markvillacampa.com
Twitter: @MarkVillacampa