November 2014
Intermediate to advanced
912 pages
21h 51m
English
Content preview from iOS 8 Swift Programming CookbookBecome 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,
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.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.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.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.
Chapter 21. Cloud
21.0. Introduction
One of the really great frameworks in the iOS SDK is CloudKit. Using this framework, you can store public and private information on the cloud with ease. One of the key concepts in CloudKit is containers, which are virtual boxes that encapsulate public and private databases.
Before I go into more details about all this jargon, let’s imagine a
simple scenario. Your app is running on an iOS device and the owner of
that device has an iCloud account already set up for herself. Every app
that runs on that device has its own CloudKit container and multiple apps
can share containers if they are set up in a specific way. Your default
container is your app’s own container, but you can find a container for
another app if you know its unique identifier in the cloud. Containers are
represented by the CKContainer class in
CloudKit.
Every container (and therefore every app that uses a container) has two databases: one public and the other private. When you use the private database and store information there, the information is saved in the user’s iCloud account and is private to her on that device for your app. If you use the public database, the user doesn’t need an iCloud account to be able to read that information. So all users of your app can use information from the public database.
Note
Information that is stored in the public database for your app counts against your iCloud storage quota, so be very careful about tracking its size. The information stored ...
Become 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,
and much more.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.