In everything before iOS 9 there was a limit of 64 notifications that could be scheduled at any one time. Is this still true with the new notification system or can I schedule as many in advance as I'd like with the new UNUserNotifications?
Yes. I just updated an app of mine that schedules a lot of local notifications and the 64 limit is still in place.
来源：https://stackoverflow.com/questions/40685128/is-there-still-a-64-local-notification-limit-for-the-new-usernotifications-in-i