{"id":264,"date":"2017-01-03T00:27:06","date_gmt":"2017-01-03T00:27:05","guid":{"rendered":"https:\/\/www.couchbase.com\/blog\/syncing-with-core-data\/"},"modified":"2017-01-03T00:27:06","modified_gmt":"2017-01-03T00:27:05","slug":"syncing-with-core-data","status":"publish","type":"post","link":"https:\/\/www.couchbase.com\/blog\/es\/syncing-with-core-data\/","title":{"rendered":"Syncing with Core Data"},"content":{"rendered":"

You’ve been developing your app with a Core Data stack and now you want to add the cloud component. Prompt the user to login and save all its data to the cloud to make it available on all its devices. Or maybe it’s a content sharing app where you need to distribute data to users of the app.<\/p>\n\n\n\n

In any case, writing networking code is time consuming and error prone, so you may turn to\u00a0CloudKit<\/strong>,\u00a0Parse<\/strong>\u00a0or\u00a0Firebase<\/strong>\u00a0to intergrate the cloud component. In the case of\u00a0CloudKit<\/strong>, you can only support iOS devices and if you go with\u00a0Parse<\/strong>\u00a0or\u00a0Firebase<\/strong>\u00a0you’d have to re-write all the Core Data code.
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\nThe Couchbase Mobile team and community have been working really hard on a pluggable component to add sync to your app without re-writing your Core Data models and keeping the cross-platform support. On\u00a0iOS<\/strong>, the NSIncrementalStore class provides hooks to add pluggable back-ends to your Core Data stack.<\/p>\n\n\n\n

It’s called CBLIncrementalStore and you can find it in the Extra folder of the\u00a0.zip<\/strong>\u00a0file downloadable\u00a0here<\/a>.<\/p>\n\n\n\n

Make sure to include the CouchbaseLite.framework as well as this class to use it in your project:<\/p>\n\n\n\n

\u00a0<\/p>\n\n\n\n

<\/p>\n\n\n\n

\u00a0<\/p>\n\n\n\n

How to use CBLIncrementalSore<\/h1>\n\n\n\n

The setup process is very similar to how you would set up a Core Data stack backed by an\u00a0NSSQLiteStore<\/strong>\u00a0store. So let’s dive in.<\/p>\n\n\n\n

The goal is to have an\u00a0NSManagedObjectContext<\/strong>\u00a0instance that is associated with a persistent store coordinator loading our managed object model. And finally add a persistent store of type\u00a0CBLIncrementalStoreType<\/strong>\u00a0to the persistent store coordinator.<\/p>\n\n\n\n

\u00a0<\/p>\n\n\n\n

\"\"<\/p>\n\n\n\n

You could create a new class called\u00a0CoreDataStack<\/strong>\u00a0to hold the set up logic:<\/p>\n\n\n\n

\u00a0<\/p>\n\n\n\n

Let’s describe what’s happening step by step:<\/p>\n\n\n\n