How to send Push Notifications from iPhone?

Can an iOS app only ask for the permission to send Push Notifications on start up?

• I noticed that most (all?) of my iOS apps ask me to allow push notifications when I start them for the first time. This does not make a lot of sense when I am using an app for the first time (because I have no experience with the app and will usually not allow push notifications). In my opinion it would make more sense to ask the user when he's using a feature of the app that makes use of push notifications.

• Answer:

  No, an iOS app can request permission to send push notifications any time. And it is true that sometimes it is better to ask for permission later when it is more appropriate and deemed necessary. As to why apps ask for permission to send push notifications immediately after launch, I suppose it is (1) either due to a lack of design or (2) because many code samples illustrating how to request push notification permission show it by running it immediately after an app launches (since that makes it the smallest app possible for tutorial purposes) or (3) it makes sense for those apps.