Learning Core Data for iOS: A Hands-On Guide to Building by Tim Roadley

By Tim Roadley

This is often the 1st center information ebook to completely replicate Apple's most modern platform options, together with its dramatic fresh advancements to iCloud help. Hands-on from begin to end, it teaches you step by step as you create a latest data-driven iOS app utilizing Storyboards, ARC, iOS 7, and Xcode five. Tim Roadley introduces new styles and top practices designed to beat the frustrations of center information improvement. One step at a time, you are going to construct and expand your skills--even getting to know complicated strategies reminiscent of complicated version migration, deep replica, historical past processing, and integration with Dropbox, StackMob, and iCloud. Downloadable types of this book's major venture are supplied with each one bankruptcy, so that you can see precisely what your app undertaking may still appear like - and get cookbook-style code to your personal tasks. bankruptcy workouts assist you discover even extra, even if you are a self-learner or a scholar in an iOS improvement direction.

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Extra info for Learning Core Data for iOS: A Hands-On Guide to Building Core Data Applications

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The -shm file can be deleted or ignored. To open an SQLite database file, you can use one of many freely available SQLite database browser utilities found by searching Google. There’s a good one on Sourceforge called SQLite Database Browser you may wish to try, so take a moment now to download and install it. This application isn’t signed, so you will need to “Allow applications downloaded from Anywhere” in System Preferences > Security & Privacy > General. sqlite files. Even though browsing the contents of a database is great for debugging purposes, you should not code your application to rely on the internal, private schema of a Core Data–managed database because Apple could change it without notice.

Name); } Update Grocery Dude as follows to use the Test fetch request template: 1. 8. The new code is shown in bold and the predicate code has been removed. Run the application again to examine the logs, and you’ll see the sorted managed object names all contain the letter e, as configured in the fetch request template. 15 shows the expected results. 15 Fetched managed object names (filtered via template) Did you also notice the SQL statement generated for this fetch? You can see all the elements required to retrieve (SELECT) a filtered (WHERE) and sorted (ORDER BY) set of results.

Context deleteObject:item]; } Update Grocery Dude as follows to delete all the objects: 1. 9. 2. Run the application. 3. Press the home button (Shift+„+H or Hardware > Home) to save the changes to the context. Did you notice all the SQL statements calling DELETE that were logged to the console once you pressed the home button to trigger a save? By now you should have a reasonable level of comfort that Core Data is taking care of the backend SQL for you. Turn off SQLDebug and remove all code from the demo method before heading to Chapter 3.

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