iCarMode can remind you when your parking-meter timer ends.
Just select the parking meter interval & tap on 'Start' button, That's it!
You can close the app if you want to, iCarMode will remind you when the parking meter time is up.
iCarMode will send you a notification* and will show a badge count on the app icon.
Enjoy!
Download iCarMode from the AppStore - here.
* (make sure, you allowed this when you installed the app. you can also check this under your device settings->iCarMode).