gistfile.rb

class InsetTextField < UITextField
  attr :edgeInsets

  def init
    initWithFrame(CGRectZero)
  end

  def initWithFrame(frame)
    super.tap do
      @edgeInsets = [0, 0, 0, 0]
    end
  end

  def awakeFromNib
    @edgeInsets = [0, 0, 0, 0]
  end

  def edgeInsets=(val)
    @edgeInsets = val
    setNeedsDisplay
  end

  # placeholder position
  def placeholderRectForBounds(bounds)
    UIEdgeInsetsInsetRect(bounds, @edgeInsets)
  end

  # text position
  def textRectForBounds(bounds)
    UIEdgeInsetsInsetRect(bounds, @edgeInsets)
  end

  # editing position
  def editingRectForBounds(bounds)
    # super
    UIEdgeInsetsInsetRect(bounds, @edgeInsets)
  end

end