Introduction to RubyMotion (v2.0)

The Cool Way to Build iOS Apps

By Gant Laborde

@GantLaborde

Avid Rubyist and generally immature guy

Co-Founder of IconoclastLabs.com

Core-contributor to RubyMotion/InfiniteRed/Clearsight Studio

Author of Numerous RubyMotion projects and Pull Requests

Author of the book RubyMotion App Development
by Packt Publishing.

Motion Meetup Organizer

RubyMotion's Monthly Meetup

 meetup.RubyMotion.com

RubyMotion

RubyMotion - Wat?

OR

Apps the Ruby Way

Quick Example

Objective-C button tap

  [button addTarget:self action:@selector(buttonTapped:) 
    forControlEvents: UIControlEventTouchUpInside];
  //  Elsewhere
  - (void)buttonTapped:(id)sender {
      self.view.backgroundColor = [UIColor redColor];
  }           

RubyMotion button tap

  button.addTarget(self, action:'button_tapped', forControlEvents:UIControlEventTouchUpInside)

  # Elsewhere
  def button_tapped
    self.view.backgroundColor = UIColor.redColor
  end         

Better Example

Objective-C button tap

  [button addTarget:self action:@selector(buttonTapped:) 
      forControlEvents: UIControlEventTouchUpInside];

  //  Elsewhere
  - (void)buttonTapped:(id)sender {
      self.view.backgroundColor = [UIColor redColor];
  }
            

RubyMotion button tap (with RedPotion gem)

  find(button).on(:tap) do
    self.view.backgroundColor = color.red
  end

lessLike:objectiveC:

and more like_ruby

- Clay Allsopp

http://www.textfromxcode.com/

What about Swift!?

Swift is great ... but.

What's So Great About RubyMotion?

In my opinion

• Gems and Community
• Editor Independence
• Testing!
• Readability
• Natively Compiled
• The REPL

RubyMotion Analogy

RubyMotion is to Objective-C

As Coffeescript is to Javascript

... plus RMQ is kind of like jQuery

... plus MacBacon has spec tests like Jasmine would

... plus the REPL lets you live-modify like developer tools

... plus CDQ gives you a DB like CouchDB would

... plus it compiles and obfuscates your final codebase

... OK, this analogy got out of control

Let's Look At Code!

• Classic - Hello World
• Full App - Ruby Trivia
• Games!

Hello WorlD App Delegate

  class AppDelegate < PM::Delegate
    def on_load(app, options)
      open HelloWorldController.new(nav_bar: true)
    end
  end

Hello WorlD

 class HelloWorldController < PM::Screen
    def on_load
      p "Hai"
    end
  end  

SImply prints "Hai"

We can add a label to the screen just as easily.

Code Example #2

Ruby Trivia

• RedPotion
• BubbleWrap
• motion-concierge
• and more ...

Now using Redpotion

iconoclastlabs.github.io/rubytrivia/ 

Available on itunes 

Tests!

Let's look at the code!

Totally Tacos!

A game made in one day!