Re: NSDocument new file logic
Re: NSDocument new file logic
- Subject: Re: NSDocument new file logic
- From: Quincey Morris <email@hidden>
- Date: Wed, 29 Jun 2011 00:54:04 -0700
On Jun 28, 2011, at 23:58, Martin Hewitson wrote:
> In the past I achieved this in a somewhat unsatisfactory way by just calling newDocument: then saveDocument: and getting the user to immediately save the document before the app does the rest of the setup steps.
Using the action methods (newDocument: and saveDocument:) is what makes your approach unappealing for the user. In Snow Leopard or earlier, for a regular document, the steps are something like this:
1. Get the project name and file system location. (You can use the Save panel for this, but you put it up yourself rather than having 'newDocument:' do it. Or, you can use some kind of custom dialog.)
2. Create a document file at that location. (Typically, you create a default data model or import some data, turn it into a keyed archive, write the archive data to a file.)
3. Use NSDocumentController's 'openDocumentWithContentsOfURL:display:error:' method to open the now-existing document normally.
You can use much the same approach for NSPersistentDocument, but step 2 is a little different. Here's a method I wrote (based on some sample code somewhere in the Core Data documentation, but I don't remember where) that creates a new store. It returns a managed object context because you probably want to put something in the store (and 'save:' it) before re-opening it as a NSPersistentDocument in step 3.
> + (NSManagedObjectContext*) managedObjectContextForStoreURL: (NSURL*) storeURL
> {
> // Find the document's model
>
> NSManagedObjectModel* model = [NSManagedObjectModel mergedModelFromBundles: nil];
> if (!model)
> return nil;
>
> // Create a persistent store
>
> NSPersistentStoreCoordinator* psc = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel: model];
> if (!psc)
> return nil;
>
> NSError* error;
> NSPersistentStore* store = [psc addPersistentStoreWithType: NSSQLiteStoreType
> configuration: nil
> URL: storeURL
> options: nil
> error: &error];
> if (!store)
> return nil;
>
> // Create a managed object context for the store
>
> NSManagedObjectContext* managedContext = [[NSManagedObjectContext alloc] init];
> if (!managedContext)
> return nil;
>
> managedContext.persistentStoreCoordinator = psc;
> managedContext.undoManager = nil;
>
> return managedContext;
> }
HTH
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