RubyMotion example of keyboard handlers

create_screen.rb

Teacup::Stylesheet.new :create_screen do

  # Input Fields
  style :input_text_wrapper,
    left: 24,
    image: UIImage.imageNamed('ui-textfield-normal.png'),
    userInteractionEnabled: true,
    width: 249

  style :input_text_type,
    extends: :input_text_wrapper,
    top: 50

  style :input_text_name,
    extends: :input_text_wrapper,
    constraints: [
      constrain(:top).equals(:input_text_type, :bottom).plus(15)
    ]

  style :input_text_location,
    extends: :input_text_wrapper,
    constraints: [
      constrain(:top).equals(:input_text_name, :bottom).plus(15)
    ]

  style :input_text,
    color: BubbleWrap.rgb_color(118, 90, 59),
    height: 21,
    left: 8,
    placeholder: 'Nothing Set',
    top: 5,
    width: 237

  style :challenge_type,
    extends: :input_text,
    placeholder: 'Challenge Type'

  style :challenge_name,
    extends: :input_text,
    placeholder: 'Name of the Challenge'

  style :challenge_location,
    extends: :input_text,
    placeholder: 'Start Location'

end

create_view_controller.rb

class CreateViewController < UIViewController

  include GM::KeyboardHandler
  stylesheet :create_screen

  # Create our parent declarations, instantiate, and set properties
  def loadView
    self.view = UIView.new

    @create_challenge = UIScrollView.new

    # A nice handy function from @colinta which will intercept our keyboard delegation
    # and do work for us, like making the scroll area larger to accommodate overlap and such
    prepare_keyboard_handler(@create_challenge)
  end

  # I still need to figure out if it's going to be best to leave this logic here,
  # where I create multiple child views and attach them to @pagination ... OR if
  # these should be moved out into their own controllers.. but then how will
  # keyboard delegation and other master -> child properties get passed?
  layout :root do
    # assign our input fields to an array so we can loop through
    # and manage keyboard actions
    @input_fields = [];

  subview(UIImageView, :input_text_type) do
	  @input_fields << subview(UITextField, :challenge_type)
	end
	
	subview(UIImageView, :input_text_name) do
	  @input_fields << subview(UITextField, :challenge_name)
	end
	
	subview(UIImageView, :input_text_location) do
	  @input_fields << subview(UITextField, :challenge_location)
	end
  end

  # As the view is actually being called, lets attach our listeners
  def viewWillAppear(animated)
    super
    keyboard_handler_start

    @input_fields.each { |field|
      field.delegate = self
    }

    self.view.when_tapped do
      @input_fields.each { |field|
        field.resignFirstResponder
      }
    end
  end

  # Remove the keyboard listener
  def viewWillDisappear(animated)
    super
    keyboard_handler_stop
  end

  def textFieldShouldReturn(textfield)
    index = @input_fields.index(textfield)

    if index == @input_fields.length - 1
      textfield.resignFirstResponder
    else
      @input_fields[index + 1].becomeFirstResponder
    end
  end

end