Working with Mountain Lion's Notification Center using PyObjC

Question

I'm trying to send notifications to Mountain Lion from my python script and react to clicks on the notifications. Sending the notifications works perfectly find by now. But yet I was not able to get Lion to call back my script upon a click.

Here is what I do. I implemented a Notification class. The only purpose of an instance of that class is to provide notifications by invoking notify(). In the same method I set the object the app's delegate.

import Foundation
import objc
import AppKit

class MountainLionNotification(Foundation.NSObject, Notification):

    def notify(self, title, subtitle, text, url):
        NSUserNotification = objc.lookUpClass('NSUserNotification')
        NSUserNotificationCenter = objc.lookUpClass('NSUserNotificationCenter')
        notification = NSUserNotification.alloc().init()
        notification.setTitle_(str(title))
        notification.setSubtitle_(str(subtitle))
        notification.setInformativeText_(str(text))
        notification.setSoundName_("NSUserNotificationDefaultSoundName")
        notification.setUserInfo_({"action":"open_url", "value":url})
        AppKit.NSApplication.sharedApplication().setDelegate_(self)
        NSUserNotificationCenter.defaultUserNotificationCenter().scheduleNotification_(notification)

    def applicationDidFinishLaunching_(self, sender):
        userInfo = sender.userInfo()
        if userInfo["action"] == "open_url":
            import subprocess
            subprocess.Popen(['open', userInfo["value"]])

Now I expected applicationDidFinishLaunching_() to be called upon a click on the notification. Unfortunately that never happens. What am I doing wrong?

I've tried to add a decorator `@objc.signature("v@:^@")` to the delegate method, without success. — koloman, Aug 31 '12 at 07:15
Now I also tried to set my `MountainLionNotification` object the default notification center's delegate and implement the protocols `userNotificationCenter_didActivateNotification_()` method. Stil no success! — koloman, Aug 31 '12 at 07:51
Hey, were you able to get notifications to show from just a python script/interpreter without starting the event loop? I can't seem to even get notifications showing using the code above — GP89, Oct 24 '12 at 12:54
@GP89 - You definitely need to start the event loop; there's no way around it. — Glyph, Dec 16 '12 at 07:10
@koloman Where did you get Notification from in class MountainLionNotification(Foundation.NSObject, Notification) ? — Pylinux, May 20 '16 at 09:18
if you have an answer for Catalina please post on: https://stackoverflow.com/questions/62234033/how-create-local-notification-on-macos-catalina-pyobjc — Chromazmoves, Jun 09 '20 at 23:50

score 8 · Accepted Answer · answered Aug 31 '12 at 08:53

Ok, found it. Didn't run AppHelper.runEventLoop(). Obviously a facepalm mistake. The following code works:

class MountainLionNotification(Foundation.NSObject, Notification):

    def notify(self, title, subtitle, text, url):
        NSUserNotification = objc.lookUpClass('NSUserNotification')
        NSUserNotificationCenter = objc.lookUpClass('NSUserNotificationCenter')
        notification = NSUserNotification.alloc().init()
        notification.setTitle_(str(title))
        notification.setSubtitle_(str(subtitle))
        notification.setInformativeText_(str(text))
        notification.setSoundName_("NSUserNotificationDefaultSoundName")
        notification.setHasActionButton_(True)
        notification.setOtherButtonTitle_("View")
        notification.setUserInfo_({"action":"open_url", "value":url})
        NSUserNotificationCenter.defaultUserNotificationCenter().setDelegate_(self)
        NSUserNotificationCenter.defaultUserNotificationCenter().scheduleNotification_(notification)

    def userNotificationCenter_didActivateNotification_(self, center, notification):
        userInfo = notification.userInfo()
        if userInfo["action"] == "open_url":
            import subprocess
            subprocess.Popen(['open', userInfo["value"]])

I know this is old, but I'm getting the errors: `objc.BadPrototypeError: Objective-C expects 1 arguments, Python argument has 5 arguments for `, and `Notification is not defined`. Do you know if these can be fixed? — themthem, Jun 06 '20 at 04:49

Working with Mountain Lion's Notification Center using PyObjC

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