Pro iOS Persistence: Using Core Data

Data Storage options for iOS - Stack Overflow

NSUserDefaults offers a trivial learning curve and thread safe implementation. CoreData abstracts away a lot of the messy things you'd otherwise have to deal with yourself, such as lists of objects, one-to-many or many-to-many relationships, or constraints on object attributes, into a single nice clean object-oriented interface CoreData manages save and undo functionality for you. It has a persistent store, which tracks changes, and can be flushed to the disk automatically at any number of times However, if you're new to Cocoa I would avoid CoreData , to give yourself a chance to learn the basics first.

Thanks i think CoreData is the way to go, head first i think: CoreData is a very broad topic and it's gonna be hard to find one tutorial that covers everything.

I like tutorials from Ray Wenderlich. You can check this one out raywenderlich.

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One lecture series and two books Apart from that highly recommend reading 1. Oritm 1, 2 20 Actually, NSUserDefaults only support property list objects: Sign up or log in Sign up using Google. Sign up using Facebook. If a small amount of information - such as user and application preferences - is all that needs to persist between launches, the NSUserDefaults class is a good choice. Key-value pairs, dictionaries and arrays can all be stored as user application preferences using the NSUserDefaults class.

Pro Core Data for IOS: Data Access and Persistence Engine for Iphone, Ipad, and iPod Touch

Using a property list. If the app requires more extensive data to be stored and retrieved on a regular basis - like a contacts, recipes, shopping lists, etc. One of the most powerful features of the iOS platform is the ease of integrating database features into an app. Using Core Data virtually eliminates the need to work directly with the database, therefore insulating the developer from writing transact SQL statements to manipulate the data. An iOS app will typically need to interact with only a few classes.

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The NSManagedObject class represents elements that get stored. Think of a managed object as a single record in a table. The managed object context class handles creating, working with and saving managed objects. Give the entity a name that best represents the collection of data that will be captured and stored. For example, if you were developing an iOS app for storing information about various wines in your collection, you might name the entity 'Wines. Depending on the complexity of information stored, it may be necessary to create several entities with defined relationships.

From a database programmer's perspective, this approach is known as normalization.

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Normalization helps with performance when searching, filtering and sorting large datasets. Managed objects can be considered dictionaries with a known set of keys. Attributes for managed objects can be accessed using the valueForKey accessor method.

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