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Ruby, Meet iPhone
The document discusses RubyMotion, a Ruby implementation for iOS development that offers a flexible syntax and object model similar to Objective-C. It highlights features like garbage collection, method invocation syntax, and the integration of Ruby's capabilities in creating internal DSLs. The document also touches on the REPL (Read-Eval-Print Loop) context changes while interacting with UI elements in the simulator.
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Ruby, Meet iPhone
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- 2. @atomicobject http://spin.atomicobject.com A Tourof RubyMotion • Implementation of Ruby • Similar object model to Objective C, natural language for the platform • UNIX Ethos • Very Flexible
- 6. From our app directory,we can run our app in the simulator with a simple command.
- 7. From-scratch implementation ofRuby. Started by apple in 2007.
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- 10. @atomicobject http://spin.atomicobject.com Garbage Collection (Sortof. Auto-release and retain, similar to ARC.)
- 14. (App idea shamelesslyripped off from HipByte.)
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- 23. Classes and methods;no header files; rest arguments. What you don’t see in the usual case is the flexibility of Ruby.
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- 25. Keyword args: addedto RubyMotion for Obj-C compatibility, now standard in Ruby 2.0.
- 26. do is syntaxfor blocks. Very similar to Objective C blocks parent= is just a method assumed to exist on el. Aliases to setParent if el is an Objective C object.
- 27. These features ofruby make it great for creating internal DSLs. Why create separate parsers for incomplete languages when your primary language is so flexible?
- 28. Unlike most languages,there are no contexts where you can’t put code. For example, within a class definition, you can do whatever you want.
- 29. For example, wecould put a print statement in our class def.
- 32. This is howyou’d normally write it.
- 33. Checking of validobjects in ActiveRecord validates is a method on class objects inheriting from ActiveRecord::Base
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- 63. Now, if wehold command and click on an element, the context of our REPL changes to the clicked element. Right now our REPL says (main), meaning we haven’t clicked an element.
- 64. If we command-clickour text-box, we see UILabel:0xf975. Now “self” refers to that element.
- 65. So we canset self.backgroundColor to see it change to red. Or we can tweak frame size to get the positioning just right.
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