APNs

Push Notifications in iOS: A Complete Guide Push notifications are one of those iOS features that look straightforward from the outside — a banner appears, the user taps it, something happens. But once you start building a production system around them, you realise there are a surprising number of moving parts: APNs environments, device token lifecycle, background execution budgets, notification categories, the delegate method that handles three different app states. Get any one of these wrong and notifications silently stop working with no error thrown anywhere. ...