MobiRubyiOS + Ruby = Super Awesome!!

Hi! I’m masuidrive.

• Yuichiro MASUI (masuidrive, Ichi)

• Open source developer, Ruby fun

• FrogApps, Inc. ex-Appcelerati

• Pukiwiki, Ruby on Rails tutorial movie in Japanese, IKEA hacker

• Furo-grammer (Coding in hot tub)

What’s MobiRuby?

• iOS app development environment on mruby

• Can access native functions

• Have plan for Android version

Demo Apps

• MobiRuby Game

Vision

• MobiRuby provides Ruby power to Mobile devices

• DSL is most important Ruby power

How you can get it

• http://mobiruby.org/

• It’s initial and truly ALPHA version, so it’s for only mruby and iOS hackers.

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

mruby

• New implementation of Ruby for embedding

• Built by dad Matz

• Less memory and storage

• Not required POSIX, only C99

• Simple spec, Not included File, Socket, Thread and ext libraries

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

mruby-cfunc

• C function bridge for mruby

• Call C based function directly

• Based on libFFI

• Like DL library on CRuby

mruby-cfunc

str  =  "STRING"

CFunc::call(CFunc::Void,  "puts",  str)

STRING

mruby-cfunc

str  =  "STRING"

ptr  =  CFunc::Pointer.malloc(7)

result_ptr  =  CFunc::call(CFunc::Pointer,  "strcpy",  ptr,  str)

ptr.to_s

-­‐>  “STRING”

mruby-cfunc

\

class  TestStruct  <  CFunc::Struct        define  CFunc::SInt8,    :x,                      CFunc::SInt16,  :yend

test  =  TestStruct.newtest[:x]  =  10

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

mruby-cocoa• Cocoa bridge for mruby

• Use Cocoa functions transparently

• Based on mruby-cfunc and Cocoa runtime

• Manipulate Cocoa objects

• Create class/instance, inherit existing classes

• Garbage collection

Bridge Cocoa runtime

• Objective-C has powerful runtime features

• Create and modify class dynamically

• ObjC class <- Ruby class <- ObjC class

• ObjC value interconverted with Ruby value

• Supported delegate and blocks

Memory management

• Objective-C - Reference count

• mruby - Mark & Sweep

• Swizzled Objective-C release method

Multi-threading

• MobiRuby does not support threads

• Because mruby does not support threads

• I have not touched them yet

• Need to implement multi VM instead of thread

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

mobiruby-ios

• iOS specific utilities

• Bootstrap

• Xcode integration

• Wrapped classes

Wrapped Audio Playerclass  AudioPlayer        def  initialize(filename)                name,  ext  =  filename.split(".")                path  =  Cocoa::NSBundle._mainBundle.                      _pathForResource  name,  :ofType,  ext                url  =  Cocoa::NSURL._fileURLWithPath  path                @avap  =  Cocoa::AVAudioPlayer._alloc.                  _initWithContentsOfURL  url,  :error,  nil        end

       def  play;  @avap._play;  endend

AudioPlayer.new("bgm00.wav").play

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

mobiruby-common

• Will be common utilities with Android ver.

• require method

• Some POSIX based functions

MobiRuby stack

iOS

mruby

mruby-cfunc

Your code

mruby-cocoa

mobiruby-common

mobiruby-ios

Your code

class  Cocoa::MyAlertView  <  Cocoa::UIAlertView        define  C::Void,  :alertView,  Cocoa::Object,            :clickedButtonAtIndex,  C::Int  do  |me,  index|                if  index.to_i  ==  1                        app  =  Cocoa::UIApplication._sharedApplication                        str  =  "http://mobiruby.org"                        url  =  Cocoa::NSURL._URLWithString(str)                        app._openURL  url                end        endend

Your code

alert  =  Cocoa::MyAlertView._alloc._initWithTitle    "Hello",    :message,  "I  am  MobiRuby",    :delegate,  nil,    :cancelButtonTitle,  "I  know!",    :otherButtonTitles,  "What's?",  nil

alert._setDelegate  alertalert._show

Road map

• Finished building Cocoa bridge

• Fix bugs, Improvement

• Packaging

• Documentation

• Build wrapped APIs

Road map

• Finished building Cocoa bridge

• Fix bugs, Improvement

• Packaging

• Documentation

• Build wrapped APIs

Road map

• Finished building Cocoa bridge

• Fix bugs, Improvement

• Packaging

• Documentation

• Build wrapped APIs

Version 1Q1 2013

Progress in Sept 2012

• Already MobiRuby based app is in AppStore

• Finally released alpha 1

• It's only for iOS and mruby hackers

• Need deeply understanding Cocoa runtime, mruby, Garbage collection

Current tasks

• Fixed crashing bugs and memory leaks

• Test Test Test!!!

• Support `long` and `long long`, define Cocoa property and more...

• Circular reference

• mruby stability

What’s difference?

• RubyMotion

• Rhodes

• Ruboto

• RubyCocoa

• Titanium Mobile

What’s difference?

• RubyMotion

• Rhodes

• Ruboto

• RubyCocoa

• Titanium Mobile

Diversity is Good

Pros.

• Ruby power

• Based on Matz implemented Ruby

• MIT license

• Compact (~3000 lines)

• An unexplored field

Cons.

• Buggy

• Less classes / functions

• Don't have debugging feature

• Need to understand iOS and Cocoa

FAQ

• Can I use RubyGems?

• Can I use meta programming?e.g., define_method, eval

• Can I use exists Cocoa libraries?

• Can I define new method to exist Cocoa class?

• What version iOS does it support?

Can I use RubyGems?

• No, mruby doesn’t have compatibility with CRuby ext. APIs.

• You need to write new extension for mruby

Can I use meta programming?e.g., define_method, eval

• Yes, mruby supports almost all dynamic programming features.

• But MobiRuby doesn’t support eval. mruby can remove compiler. (it’s for Apple)

Can I use existing Cocoa libraries?

• Yes, you can use almost all existing libraries.

• I think CocoaPods will be a good partner

Can I define new method to exist Cocoa class?

• Yes, You can define new methods from Ruby

• You can inherit exists Cocoa and create new class from Ruby

What version iOS does it support?

• MobiRuby supports iOS4 and higher version.

• I tested on iOS4 and iOS5. Probably run on iOS6.

Wanted contributions

• Here’s your big chance!

• Need understanding C/Objective-C and iOS development

• Owned OSX and iOS developer license

Thank you

• Logo design: Maylis Agniel

• http://mobiruby.org

• http://fb.me/mobiruby

• http://twitter.com/mobiruby

• http://github.com/mobiruby