Core Data by Tutorials: iOS 8 and Swift Edition by Aaron Douglas, Saul Mora, Matthew Morey, Visit Amazon's

By Aaron Douglas, Saul Mora, Matthew Morey, Visit Amazon's Pietro Rea Page, search results, Learn about Author Central, Pietro Rea,

Learn middle information with rapid! Take regulate of your facts in iOS apps utilizing center facts, via a chain of top of the range hands-on tutorials.

Start with with the fundamentals like developing your personal center facts Stack the entire approach to complicated themes like syncing with iCloud, migration, functionality, multithreading, and extra! by way of the tip of this booklet, you’ll have hands-on event with center information and may be capable to use it on your personal apps.

Who This ebook Is For:This ebook is for intermediate iOS builders who already comprehend the fundamentals of iOS and speedy improvement yet are looking to tips on how to use middle info to save lots of info of their apps.

Topics lined in middle information by way of Tutorials:

  • Your First middle facts App: You’ll click on File\New undertaking and write a middle information app from scratch!
  • NSManagedObject Subclasses: tips on how to create your individual subclasses of NSManagedObject - the bottom info garage type in middle Data.
  • The middle facts Stack: find out how the most items in center information interact, so that you can flow from the starter Xcode template for your personal system.
  • Intermediate Fetching: This bankruptcy covers how one can fetch info with center info - fetch requests, predicates, sorting and asynchronous fetching.
  • NSFetchedResultsController: the right way to make middle facts play well with desk perspectives utilizing NSFetchedResultsController!
  • Versioning and Migration: during this bankruptcy, you’ll the right way to migrate your user’s facts as they improve via varied types of your facts model.
  • with iCloud: tips on how to make your apps synchronize throughout units, utilizing the facility of iCloud!
  • Unit Tests: during this bankruptcy, you’ll how you can organize a try setting for middle info and notice examples of ways to check your models.
  • Measuring and Boosting Performance: how one can degree your app’s functionality with quite a few Xcode instruments and take care of gradual spots on your code.
  • Multiple controlled item Contexts: find out how a number of controlled item contexts can enhance functionality and make for purifier code.

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The iOS educational crew takes satisfaction in ensuring every one instructional we write holds to the top criteria of caliber. we need our tutorials to be good written, effortless to persist with, and enjoyable. And we don’t are looking to simply skim the outside of an issue – we wish to quite dig into it, so that you can actually know the way it really works and observe the data at once on your personal apps.

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Extra resources for Core Data by Tutorials: iOS 8 and Swift Edition

Sample text

Alternatively, you could serialize the UIColor instance to NSData and save it as binary data. Then again, you’d also have to “add water” afterward to convert the binary data back to the UIColor object you wanted in the first place. com Page 39 Core Data by Tutorials Chapter 2: NSManagedObject Subclasses Once again, Core Data has your back. plist, you probably noticed that each bow tie has an associated color. Select the Bowtie entity in the model editor and add a new attribute named tintColor of data type Transformable: You can save any data type to Core Data (even ones you define) using the transformable type as long as your type conforms to the NSCoding protocol.

Since viewDidLoad can be called every time the app is launched, insertSampleData itself performs a fetch to make sure it isn’t inserting the sample data into Core Data multiple times. 2. You create a fetch request for the purpose of fetching the newly inserted Bowtie entities. The segmented control has tabs to filter by color, so the predicate adds the condition to find the bow ties that match the selected color. Predicates are both very flexible and very powerful—you’ll read more about them in chapter 4.

Finally, you commit your changes as usual by saving the managed context and refresh the UI to see your changes in real time. Try it out. Build and run the app and tap Rate: Enter any decimal number from 0 to 5 and tap Save. As you would expect, the rating label updates to the new value you entered. Now tap Rate one more time. Remember the timeless elegance of a red bow tie? Let’s say you like it so much that you decide to rate it a 6 out of 5. com Page 52 Core Data by Tutorials Chapter 2: NSManagedObject Subclasses While you may absolutely love the color red, this is neither the time nor the place for hyperbole.

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