March 2013
Intermediate to advanced
1000 pages
34h 51m
English
Content preview from Programming iOS 6, 3rd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Local Notifications
A local notification is an alert to the user that can appear even if your app is not running. In one of its manifestations, it appears as a dialog on top of whatever the user is doing at that moment, which is why it is treated in this chapter. (If a local notification from some other app were to appear as a dialog while your app is frontmost, your app would become inactive; see Chapter 11 and the applicationWillResignActive: app delegate message.)
Note
This use of the term notification has nothing to do with NSNotification (Chapter 11). The ambiguity is unfortunate.
Your app does not present a local notification alert: indeed, your app can’t present a local notification alert, because if your app’s local notification alert appears, your app ex hypothesi isn’t frontmost. Rather, your app hands a local notification to the system along with instructions about when the local notification should fire. When the specified time arrives, if your app isn’t frontmost, the system presents the notification on your behalf.
The user has several choices as to how a notification from your app should be presented. These choices appear in the Settings app, under Notifications. There is a Notification Center, which appears when the user swipes downward from the very top of the screen, and the user can enable or disable your app’s notifications appearing there. A notification from your app can also appear as an alert, as a temporary banner at the top of the screen, or not at all. The ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.