You can create Fetch Requests in the Xcode model editor, including a Predicate. These are somewhat easier to setup. To create one, select your .xcdatamodeld file, then head over to Editor – Add Fetch Request. Give it a catchy name and a filter property, and much of the above code becomes obsolete. Here’s how you […]
Retrieving Managed Objects is somewhat more complex than creating them, mainly because you can filter what you’re getting back rather than retrieve everything that your store file has to offer. Let’s first illustrate a basic NSFetchRequest. For the following examples I’m using the iOS Master/Detail template which provides an Entity called Event with a property […]
Assuming you’re using an app template that includes Core Data, you will have access to the Managed Object Context. In the simplest form, and without custom Entity classes setup, you can use key/value coding to set your object’s properties. In fact, the Master/Detail template does this. Here’s an example for an Entity named Event with […]
Likewise we can save our previously selected file using an NSSavePanel. It too is easy to use, just as the NSOpenPanel. For a save action to make sense we need to have some data to save, so in this example we will copy an existing file (self.myURL) to the new URL that the save panel […]
NSOpenPanel is surprisingly easy to use: create the panel, call the openPanel method, and handle the returned URL object in a block. In this example we invoke the panel from a button in the main window, then display the returned URL in a textLabel: – (IBAction)loadFile:(id)sender { // create an open documet panel NSOpenPanel *panel […]
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If the App Delegate has something that your top view controller needs then you simply pass it the required object via a property set on the top view controller. This is easy when your top view controller is also the root view controller. However, when you embed your top view controller in a Navigation Controller, […]
Likewise, here’s how we return the number of rows using a fetched results controller – as provided by the Master / Detail template: – (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { id <NSFetchedResultsSectionInfo> sectionInfo = [[self.fetchedResultsController sections]objectAtIndex:section]; return [sectionInfo numberOfObjects]; }