CODEWITHSUNDEEP
iosarraysuitableviewcore-dataswift
martin
martin

Reputation: 1974

Swift and core data - Array and cell basics

If I define my array as:

var myList: Array <AnyObject> = []

and then use the viewDidLoad override function to populate this array like this:

override func viewDidAppear(animated: Bool) {
    let appDel:AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
    let context:NSManagedObjectContext = appDel.managedObjectContext!
    let freq = NSFetchRequest(entityName: "List")

    myList = context.executeFetchRequest(freq, error: nil)!
    tableView.reloadData()
}

and my "List" only contains usernames as strings. What exactly is being stored in "myList"? Is it just as simple as an array of strings with the usernames?

Any thoughts and explanations would be highly appreciated.

Upvotes: 1

Views: 245

Answers (2)

dpassage
dpassage

Reputation: 5453

executeFetchRequest returns an array of managed objects from the CoreData data store. There are basically two ways to handle them.

The first is to use them as-is. They will all be instances of NSManagedObject, and you can use methods like valueForKey: to get their values.

The second way is to define your own subclass of NSManagedObject, in your case probably named List, and then define properties on that object allowing you to access the values directly.

Core Data as a whole is both insanely powerful and insanely complex. I strongly recommend you work through a tutorial, either Apple's or otherwise, to get a hang of it. (Note that some of Apple's docs recommend starting with something called Core Data Starting Point. Helpfully, Apple has retired that document, but hasn't yet removed the references to it from other documents.)

Upvotes: 1

picciano
picciano

Reputation: 22701

Your myList would contain subclasses of NSManagedObject or List instances if you have defined that class. Each object would have attributes that you have defined for that core data object.

The indexPath is a class that is used to represent the row and section of the UITableView. This is also used to identify the item and section of a UICollectionView.

Upvotes: 1

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