Simple Core Data Relationships

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The TaggedLocations application illustrates how you can manipulate Core Data attributes and relationships in an iOS application.

The first screen displays a table view of events, which encapsulate a time stamp, a geographical location expressed in latitude and longitude, and a name for the event. The user can add, remove, and edit events using the first screen.

Events have a to-many relationship to tags (which have an inverse to-many relationship to events). Tags have a name which describes a feature of an event. Tags are displayed in a second table view; when a tag is related to the selected event, a check mark is displayed in the corresponding row.

Main Components

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View Controllers

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APLEventsTableViewController

The table view controller responsible for displaying the list of events, supporting additional functionality:

 * Addition of new events

 * Deletion of existing events using UITableView's tableView:commitEditingStyle:forRowAtIndexPath: method

 * Editing an event's name

APLTagSelectionController

The table view controller responsible for displaying and editing tags.

The rows show a check mark if the selected event is related to the corresponding tag. 

Model

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TaggedLocations.xcdatamodeld

The Core Data managed object model for the application.

APLEvent

A Core Data managed object class to represent an event containing geographical coordinates and a time stamp.

APLTag

A Core Data managed object class to represent a tag.

Table View Cells

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APLEventTableViewCell

Table view cell to display information about an event.

The delegate is the RootViewController table view controller which acts as:

* The name text field's delegate to respond to editing operations

* The target of the tag button to initiate tag editing

APLEditableTableViewCell

Table view cell to present an editable text field.

Application configuration

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APLAppDelegate

Configures the Core Data stack and passes a managed object context to the first view controller.

MainStoryboard.storyboard

Loaded automatically by the application.

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