My presentation will be on the topic of MacRuby. MacRuby is relevent to Ruby developers because it allows us to dive into the world of Mac OS X development using Ruby 1.9. Unlike RubyCocoa, where we would need to use both Ruby and Objective-C, MacRuby's API allows us to just use Ruby. I will go into a brief history of MacRuby and explain just why it is important to us as Ruby developers. I will then do some live coding of a quick desktop application using MacRuby. Attendees will be able to take away from the presentation a good understanding of MacRuby and the passion to develop something of their own using it.

1. MAC
RUBY
Brendan G. Lim
@brendanlim
brendan@intridea.com

2. WHO HERE HAS A
MAC?

3. WHO HERE HAS
WORKED WITH
OBJECTIVE-C?

4. DEVELOPED
OSX OR IPHONE APPS?

5. OBJECTIVE-C
• Object-oriented extensions to C
• Strongly typed
• Like Ruby, influenced by Smalltalk
• Primary language for Cocoa
• Garbage collection (2.0)
• 32 and 64-bit support

6. COCOA
• Set of object-oriented frameworks
• Used for writing Max OSX and iPhone OS apps
• Includes FoundationKit, and AppKit
• Typically built using tools like XCode and Interface Builder

7. CORE FOUNDATION
• Low level libraries that ship with Mac OSX
• Used for passing primitive types to OSX C routines
• Most routines follow ‘CF’ naming convention
• Open-Sourced by Apple as CF-Lite

8. WHY RUBY INSTEAD
OF OBJECTIVE-C?

9. RUBY VS OBJECTIVE-C
object.method(param)
=
[object method:param];

10. RUBY VS OBJECTIVE-C
person.set_name(“john”, “doe”)
=
[person setNameWithFirst:@”john”
withLast:@”doe”];

11. RUBY VS OBJECTIVE-C
array = []
=
NSMutableArray *array =
[[NSMutableArray alloc] init];

12. RUBY VS OBJECTIVE-C
“ string”.strip
=
[@“ string” stringByTrimmingCharactersInSet:
[NSCharacterSet whitespaceAndNewlineCharacterSet]]

13. RUBY VS OBJECTIVE-C
dictionary = {“key1” => “value1”, “key2” => “value2”}
=
NSArray *keys = [NSArray arrayWithObjects:@”key1”,@”key2”];
NSArray *data = [NSArray arrayWithObjects:@”value1”,@”value2”];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:objects forKeys:keys];

14. RUBYCOCOA
• Mac OSX framework
• Bridge between Objective-C and Ruby
• Can manipulate Objective-C objects using Ruby
• Write Cocoa apps in Ruby
• Runs on Ruby 1.8
• Ships with OSX Leopard

15. RUBYCOCOA VS OBJECTIVE-C
setObject_forKey_(iphone, phone)
=
[setObject:iphone forKey:phone];

16. SO WHY NOT
RUBYCOCOA?

17. WHY NOT RUBYCOCOA
• Performance
• Two runtimes
• Two garbage collectors
• Object conversions
• Syntax doesn’t feel like Ruby

18. MAC
RUBY
+

19. MAC
RUBY
• Impl. of Ruby 1.9 that runs on the Objective-C runtime
• Open sourced by Apple
• Originally created by Laurent Sansonetti
• Replacing RubyCocoa
• Objects are peers with no translation layer
• Multi-core (Grand Central Dispatch)
• HotCocoa Support

20. MAC
RUBY
Object NSObject
String NSMutableString
Number NSNumber
Array NSMutableArray
Hash NSMutableDictionary

21. MAC
RUBY
Objects Objective-C
Classes Objective-C
Methods Objective-C

22. MAC
RUBY
>> s = “rubyconf”
=> “rubyconf”
>> s.class
=> NSMutableString
>> s.class.ancestors
=> [NSMutableString,NSString,Comparable,NSObject,Kernel]
>> s.upcase
=> “RUBYCONF”
>> s.uppercaseString
=> “RUBYCONF”

23. MAC
RUBY
>> NSString.new(“rubyconf”)
=> “rubyconf”
>> NSString.stringWithString(“rubyconf”)
=> “rubyconf”
>> NSString.alloc.initWithString(“rubyconf”)
=> “rubyconf”

24. MAC
RUBY
>> a = []
=> []
>> a.class
=> NSMutableArray
>> a.class.ancestors
=> [NSMutableArray,NSArray,Enumerable,NSObject,Kernel]
>> a << “RubyConf”
=> [“RubyConf”]

25. MACRUBY VS OBJECTIVE-C
-(void) locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
}

26. MACRUBY VS OBJECTIVE-C
def locationManager(manager
didUpdateToLocation:newLocation
fromLocation:oldLocation)
end
-(void) locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
}

27. MACRUBY VS OBJECTIVE-C
def locationManager(manager
didUpdateToLocation:newLocation
fromLocation:oldLocation)
end
>> locationManager(manager
didUpdateToLocation:newLocation,
fromLocation:oldLocation)

28. MACRUBY VS OBJECTIVE-C
def locationManager(manager
didUpdateToLocation:newLocation
fromLocation:oldLocation)
end
>> locationManager(manager
:didUpdateToLocation => newLocation,
:fromLocation => oldLocation)

29. MACRUBY VS OBJECTIVE-C
Interface Builder Outlets
attr_accessor :my_string
=
# Interface (header file)
NSString *myString;
@property(nonatomic,retain) IBOutlet NSString *myString;

30. MACRUBY VS OBJECTIVE-C
Interface Builder Actions
def my_action(sender)
...
end
=
# Interface
-(IBAction) myAction:(id)sender;
# Implementation
-(IBAction) myAction:(id)sender { ... }

31. WAIT, WHAT ABOUT
MACRUBY FOR IPHONE/IPAD?

32. MAC
RUBY
Xcode

33. MAC
RUBY
Interface Builder

34. MAC
RUBY
Instruments

35. MAC
RUBY
Let’s build something ...

36. TDD IN MACRUBY
• Good supports for tests
• AnyRuby testing framework instantly becomes an
Objective-C testing framework
• Test::Unit
• RSpec
• Cucumber
• etc...

37. HOTCOCOA
• Use Ruby to build a UI without Interface Builder
• Developed by Rich Kilmer
• MacRuby 0.5 now supports HotCocoa
• Packaged as a gem in MacRuby 0.5

38. MACRUBY VS HOTCOCOA
win = NSWindow.alloc.initWithContentRect([10,20,300,300],
:styleMask => (NSTitleWindowMask |
NSCloseableWindowMask |
NSMiniatureizableWindowMask |
NSResizeableWindowMask)
=
win = window :frame => [10,20,300,300]

39. HELLO WORLD IN
HOTCOCOA
require ‘rubygems’
require ‘hotcocoa’
include HotCocoa
application do |app|
win = window :size => [100,50]
b = button :title => ‘Hello’
b.on_action { puts ‘World!’ }
win << b
end

40. MAC
RUBY
Very exciting future

41. MAC
RUBY
It’s Ruby for Cocoa Apps!

42. MAC
RUBY
Questions?
http://macruby.org
http://macruby.org/hotcocoa.html
http://bit.ly/macruby-getting-started
http://bit.ly/macruby-examples
http://bit.ly/tdd-macruby
http://github.com/masterkain/macruby