animate_xib.rb

#!/usr/bin/env macruby
framework 'AppKit'

require 'tempfile'
require 'shellwords'


class WindowController < NSWindowController
  def awakeFromNib
    @timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target:self, selector:'onTimer', userInfo:nil, repeats:true)
  end

  def applicationShouldTerminateAfterLastWindowClosed(app)
    true
  end

  def onTimer
    window = NSApp.windows[0]

    return unless window

    window.setLevel(NSStatusWindowLevel)

    views = window.contentView.subviews
    views.each do |view|
      if view.respond_to?(:startAnimation)
        view.startAnimation(self)
      end

      if view.class.to_s =~ /slider/i
        view.setDoubleValue(rand(100))
      end

      if view.respond_to?(:setState)
        view.setState(rand > 0.5 ? NSOnState : NSOffState)
      end

      if view.respond_to?(:highlight)
        view.highlight(rand > 0.9)
      end

      if view.respond_to?(:setBezelStyle)
        view.setBezelStyle(rand(15) + 1)
      end
    end
  end
end

# path for .xib
xib_path = ARGV.shift

# create .nib
tmpfile = Tempfile.new('tmp.nib')
system("ibtool #{Shellwords.escape(xib_path)} --compile #{Shellwords.escape(tmpfile.path)}")

nib = NSNib.alloc.initWithContentsOfURL(NSURL.fileURLWithPath(tmpfile.path))
owner = WindowController.new
app = NSApplication.sharedApplication
app.setDelegate(owner)
nib.instantiateNibWithOwner(owner, topLevelObjects:nil)

NSApp.run