objc_util_ext.py

objc_util_ext.py

# coding: utf-8

from objc_util import *

NotificationCenter = ObjCClass('NSNotificationCenter').defaultCenter()
_registered_notifications = []	# keep a reference, so you can later delete them.

def import_framework(name):
	fmw = ObjCClass('NSBundle').bundleWithPath_('/System/Library/Frameworks/{}.framework'.format(name))
	fmw.load()
	return fmw

def observer_add(notification_name,function,sender=None):
	def internalFunction_(_self,_cmd,n):
		function(n)
	NotificationObserver = create_objc_class('NotificationObserver', methods=[internalFunction_],debug=False)
	observer_instance = NotificationObserver.alloc().init()	
	NotificationCenter.addObserver_selector_name_object_(observer_instance, 'internalFunction:', notification_name, sender)
	_registered_notifications.append(observer_instance)
	return observer_instance

def observer_trigger(notification):
	NotificationCenter.postNotificationName_object_(notification,None)

def observer_remove(observer):
	NotificationCenter.removeObserver_(observer)
	_registered_notifications.remove(observer)
	
def observer_remove_all():
	while len(_registered_notifications) > 0:
		observer_remove(_registered_notifications[-1])
		
def dir_print(objc_object):
	print '\n'.join(dir(objc_object))


if __name__ == '__main__':
	
	def keyboard_changed(n):
		print 'Keyboard state was changed'
	try:
		keyboard_up_observer = observer_add('UIKeyboardDidShowNotification',keyboard_changed)
		keyboard_down_observer = observer_add('UIKeyboardDidHideNotification',keyboard_changed)
		while True:
			pass
	finally:
		observer_remove(keyboard_up_observer)
		observer_remove_all()