iphone tab bar controller and core data

iphone xcode core-data uinavigationcontroller tabbarcontroller
Sway picture Sway · Sep 2, 2009 · Viewed 10.9k times · Source

Ok bit of a newbie type question.

I want to use Core Data, together with Tab and Navigation controllers.

In XCode if I create a Navigation Based Application I get the option to choose Core Data. Whereas If I create a Tab Bar Application I don't get the choice.

I understand that Tab Bars display view controllers so it kinda makes sense. However given that by default it sticks the basic Core Data code in the Application delegate I don't see why this isn't offered.

At the moment I'm creating the two projects and cutting and pasting between them.

Does this omission in XCode seem weird to you? Is it some sort of oversight?

Thanks, Matt

Answer

Peter Whitfield picture Peter Whitfield · Dec 14, 2009

I've faced the same problem and ended up creating a tabBar app and adding the core data stuff later.

To do so, I've:

  1. added the coredata framework to my project
  2. added #import < CoreData/CoreData.h > to myproject_Prefix.pch
  3. added declarations to delegate header and getter implementations just as created by the templates that support core data
  4. create model file - add file to resources group (or wherever you want to put your model stuff) and create a data model file.

This should get you to the same point you would be at with the core data supporting templates.

For your specific case (core data with tabbar), Apple have a good sample app:

http://developer.apple.com/iphone/library/samplecode/iPhoneCoreDataRecipes/index.html

This shows how they pass the context through to the relevant view controller defined in the xib file which was the thing that held me up for a while.

Hope this helps.

Cheers, Peter

Related questions

core data - the primary key id of a row in the database

Suppose I have a list of books stored in Core Data. I want to search for a book by it's primary key ID. I know the sqlite file created by Core Data has an ID column in each table, but …

Read More
Removing a specific entry/row from Core-Data

I'm using core data in my app, and i'm confused when it comes to removing certain rows or entries from the core data storage. I insert some products in to the storage like so: NSManagedObject *Product = [NSEntityDescription insertNewObjectForEntityForName:@"Product" inManagedObjectContext:…

Read More
I keep on getting "save operation failure" after any change on my Xcode Data Model

I started using Core Data for iPhone development. I started out by creating a very simple entity (called Evaluation) with just one string property (called evaluationTopic). I had following code for inserting a fresh string: - (void)insertNewObject { // Create a …

Read More