Prateek Prateek - 5 months ago 17
iOS Question

iOS: Delete ALL Core Data Swift

I am a little confused as to how to delete all core data in swift. I have created a button with an

IBAction
linked. On the click of the button I have the following:

let appDel: foodforteethAppDelegate = UIApplication.sharedApplication().delegate as foodforteethAppDelegate
let context: NSManagedObjectContext = appDel.managedObjectContext


Then I've messed around with various methods to try and delete all the core data content but I can't seem to get it to work. I've used removeAll to delete from a stored array but still can't delete from the core data. I assume I need some type of for loop but unsure how to go about making it from the request.

I have tried applying the basic principle of deleting a single row

func tableView(tableView: UITableView!, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath!) {

let appDel: foodforteethAppDelegate = UIApplication.sharedApplication().delegate as foodforteethAppDelegate
let context:NSManagedObjectContext = appDel.managedObjectContext

if editingStyle == UITableViewCellEditingStyle.Delete {

if let tv = tblTasks {
context.deleteObject(myList[indexPath!.row] as NSManagedObject)
myList.removeAtIndex(indexPath!.row)
tv.deleteRowsAtIndexPaths([indexPath!], withRowAnimation: UITableViewRowAnimation.Fade)
}

var error: NSError? = nil
if !context.save(&error) {
abort()
}

}

}


However, the issue with this is that when I click a button, I don't have the indexPath value and also I need to loop through all the values which I can't seem to do with context.

Answer

I have got it working using the following method:

    @IBAction func btnDelTask_Click(sender: UIButton){

        let appDel: foodforteethAppDelegate = UIApplication.sharedApplication().delegate as foodforteethAppDelegate
        let context: NSManagedObjectContext = appDel.managedObjectContext  
        let request = NSFetchRequest(entityName: "Food")

        myList = context.executeFetchRequest(request, error: nil)


        if let tv = tblTasks {

            var bas: NSManagedObject!

            for bas: AnyObject in myList
            {
               context.deleteObject(bas as NSManagedObject)
            }

            myList.removeAll(keepCapacity: false)

            tv.reloadData()
            context.save(nil)
        }
    }

However, I am unsure whether this is the best way to go about doing it. I'm also receiving a 'constant 'bas' inferred to have anyobject' error - so if there are any solutions for that then it would be great

EDIT

Fixed by changing to bas: AnyObject