Databases
StackOverflow2013
Postsdbo
PODesign pattern for Core Data iPhone App
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PODesign pattern for Core Data iPhone App
    primarykey
    data
    text
    <p>Im building an app that will use a Core Data model. I pretty new at Objective C and my usual design patterns does not really apply on Core Data and Objective C, at least I can't seem to find examples that confirms they will.</p> <p>I have been through the Apple Developer examples and different sources on the intertubes.</p> <p>It seems that to leverage Core Data I need to pass the managedObjectContext to each of my viewControllers, have the viewController implement the NSFetchedResultsControllerDelegate and then implement each of the methods for doing a fetch and subsequently implement</p> <pre><code>NSFetchedResultsChangeInsert </code></pre> <p>NSFetchedResultsChangeDelete NSFetchedResultsChangeMove NSFetchedResultsChangeUpdate</p> <p>This adds approximately 100+ lines of code in each viewController and it is 90% the same code I write again and again. Plus I have to pass everything around and keep track of it's memory footprint.</p> <p>In other languages I would build a singleton model of a few classes that held methods for maintaining and delivering data upon request, available from anywhere. It seems I can't take that approach in Objective C. If I where to build a static Class that took a managedObjectContext and returned me what I needed, I would still have to pass the managedObjectContext around to every view and it wouldn't be asynchronously like when I implement delegate methods that just gets called when a result is ready.</p> <p>I hope this makes sense and that someone can either confirm that there is no other reasonable way to do it or help point me in a direction for wrapping this up in a good way.</p> <p>Thanks:)</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USRickiG
    plurals
    1. PL
      singulars
      1. LTLinked
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. PODesign pattern for Core Data iPhone App
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PODesign pattern for Core Data iPhone App
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PODesign pattern for Core Data iPhone App
      1. This table or related slice is empty.
      1. VTUpMod
    1. COA similar question was asked here, which might also be helpful: http://stackoverflow.com/questions/1267520/where-to-place-the-core-data-stack-in-a-cocoa-cocoa-touch-application
      singulars
      1. PODesign pattern for Core Data iPhone App
      1. USBrad Larson
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload