Bool Attribute Accessors in RubyMotion

This is probably obvious to Ruby developers, but for us Objective C developers who are new to RubyMotion, I've found it common enough to define accessors for bools.

Bool accessors end with a question mark (?), so normally you do this:

class SomeClass attr_accessor :friendly

def friendly? friendly end end

or

class SomeClass attr_accessor :friendly alias_method :friendly?, :friendly end

but with a little DSL:

class Class def bool_attr_accessor(*my_accessors) my_accessors.each do |accessor| define_method(("#{accessor}?").to_sym) do !!instance_variable_get("@#{accessor}") end

  define_method("#{accessor}=") do |accessor_value|
    instance_variable_set("@#{accessor}", accessor_value)
  end
end

end end

You can do this instead:

class SomeClass bool_attr_accessor :friendly end