Swift - Retrieving core data to custom cell - ios

Question

I'm trying to retrieve core data and display it in a custom cell class. I think it will be easier if I present my code first.
This is my "original code", with a regular cell:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let CellID:NSString = "cell"
var cell: UITableViewCell = self.tv.dequeueReusableCellWithIdentifier(CellID) as UITableViewCell
if let ip = indexPath as Optional {
var data:NSManagedObject = myList[ip.row] as NSManagedObject
cell.textLabel!.text = data.valueForKeyPath("username") as String!
}
return cell
}
This is what I change my code to when trying to use the custom cell:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let CellID:NSString = "cell"
var cell: CustomCell = tv.dequeueReusableCellWithIdentifier(CellID) as CustomCell
if let ip = indexPath as Optional {
var data:NSManagedObject = myList[ip.row] as NSManagedObject
cell.titleLabel.text = data.valueForKeyPath("username") as String!
cell.dateLabel.text = data.valueForKeyPath("date") as String!
}
return cell
}
The first code works perfectly, but when using the second one I get the (lldb) runtime error.
Both "username" and "date" are saved as strings.
Any suggestions would be appreciated.
EDIT:
Additional information:
var myList: Array<AnyObject> = []
The error that pops up is just "(lldb)" and "Thread 1: EXC_BREAKPOINT (code = EXC_l386_BPT, subcode = 0x0)".
My model-file:
#objc(Model)
class Model: NSManagedObject {
#NSManaged var username: String
#NSManaged var date: String
#NSManaged var isAnonymousMessage: Bool
}
My cellForRowAtIndexPath-function:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let CellID:NSString = "cell"
var cell: CustomCell = tv.dequeueReusableCellWithIdentifier(CellID) as CustomCell
if let ip = indexPath as Optional {
let data = myList[indexPath.row] as Model
cell.titleLabel.text = data.username
cell.dateLabel.text = data.date
}
return cell
}
My viewDidAppear-function:
override func viewDidAppear(animated: Bool) {
let appDel:AppDelegate = UIApplication.sharedApplication().delegate as AppDelegate
let context:NSManagedObjectContext = appDel.managedObjectContext!
let freq = NSFetchRequest(entityName: "Message")
let en = NSEntityDescription.entityForName("Message", inManagedObjectContext: context)
let fetchRequest = NSFetchRequest(entityName: "Message")
myList = context.executeFetchRequest(fetchRequest, error: nil) as [Model]
tv.reloadData()
}
my CustomCell class looks like this:
import UIKit
class CustomCell: UITableViewCell {
#IBOutlet weak var titleLabel: UILabel!
#IBOutlet weak var dateLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}

Answer 1

I would suggest to change your code a little bit.
Load your NSManagedObjects into an Array of your Core Data Class, for example like this:
var myList = [ListObject]() // Where ListObject is your NSManagedClass
let fetchRequest = NSFetchRequest(entityName: "List")
myList = context.executeFetchRequest(fetchRequest, error: nil) as [ListObject]
// You should load this once (maybe in ViewDidLoad) so every Core Data object gets only fetched once (you could easy refresh this if needed).
Then use in your cellForRowAtIndexPath:
let data = myList[indexPath.row] as ListObject
cell.titleLabel.text = data.name
cell.dateLabel.text = data.date
// You dont need to use "valueForKeyPath" - just use the property as shown above.

Answer 2

var cell: CustomCell = tv.dequeueReusableCellWithIdentifier(CellID) as CustomCell
Crashing on this line means that you're not getting a CustomCell back when you dequeue from the tableview.
You need to register the class with that reuse identifier, either by setting it in the storyboard or xib, or calling registerClass(_ cellClass: AnyClass, forCellReuseIdentifier identifier: String) on the table view, normally in view did load.
If you've added a new cell to the storyboard and want to use it instead of the default one, make sure the reuse identifier is set correctly.