Mine

#!/usr/bin/ruby -wrequire 'bodyhack'require 'Qt'#This Widget isclass BodyHackUI < Qt::Widget    slots 'on_spinBox_valueChanged(int)'    def initialize(parent = nil)        super(parent)        @main_window = load("widgets/mainwindow.ui")        #@ui_spinBox = @main_window.findChildren(Qt::SpinBox, "spinBox")[0]        @ui_spinBox = findChild(Qt::SpinBox, "spinBox")        Qt::MetaObject.connectSlotsByName(self)        @main_window.show()    end    def on_spinBox_valueChanged(value)        puts("#{value} foo")    end    def load(filename)        @loader ||= Qt::UiLoader.new        q_file = Qt::File.new(filename)        w = @loader.load(q_file, self)        q_file.close()        return w    endendapplication = Qt::Application.new(ARGV)BodyHackUI.newapplication.exec