UITextField does not get the text value of an Array

Question

I am using core data to save user input in an array. Until then the code works perfectly , the problem is the time to get some element of that array and put in UITextField as a text. The code has no errors , just does not work as it should.

@IBOutlet weak var quoteTextField: UILabel!
@IBOutlet weak var addQuote: UIButton!
@IBOutlet weak var deleteQuote: UIButton!

var bookArray: Array<AnyObject> = []

override func viewDidLoad() {
super.viewDidLoad()        

//Get the info on the CoreData
var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
var context:NSManagedObjectContext = appDel.managedObjectContext!
var request = NSFetchRequest(entityName: "BookArray")
request.returnsObjectsAsFaults = false
bookArray = context.executeFetchRequest(request, error: nil)!

if (bookArray.count != 0){
    var randomIndex = Int(arc4random_uniform(UInt32(bookArray.count)))
    quoteTextField.text = bookArray[randomIndex] as? String
   }
}

DataModel

And this is where I am saving the user input, which is located in another View Controller:

 @IBAction func saveOnData(sender: AnyObject) {

    var quoteInputText = quoteInput.text

    var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
    var context:NSManagedObjectContext = appDel.managedObjectContext!

    var newQuote = NSEntityDescription.insertNewObjectForEntityForName("BookArray", inManagedObjectContext: context) as! NSManagedObject

    newQuote.setValue(quoteInputText, forKey: "myFirstBook")

    context.save(nil)

    println(newQuote)

}

Can you please post the declaration of your BookArray entity? I will write down what's wrong with this code, but if you provide the declaration I will show you how to fix it :) — Andriy Gordiychuk
– Andriy Gordiychuk, Commented Jul 14, 2015 at 20:41

Andriy Gordiychuk · Accepted Answer · 2015-07-15 11:53:35Z

1

Going line by line.

First you create a fetch request:

var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
var context:NSManagedObjectContext = appDel.managedObjectContext!
var request = NSFetchRequest(entityName: "BookArray")
request.returnsObjectsAsFaults = false

Then you assign the result of your fetch request to the array called bookArray:

bookArray = context.executeFetchRequest(request, error: nil)!

Function executeFetchRequest returns [AnyObject]. In your case it will return an array of BookArray entities [BookArray].

So, when you call:

bookArray[randomIndex]

you get an instance of BookArray. Of course your conditional downcast to String will always fail ;)

Here is what you have to do:

1) Add the following class to your project:

import Foundation
import CoreData

@objc(BookArray)
class BookArray:NSManagedObject {
    @NSManaged var myFirstBook:String
}

Then open you Core Data model, click on the BookArray entity and make sure that you et its class to BookArray in the attributes inspector:

enter image description here

2) With such implementation you can rewrite your save function to:

 @IBAction func saveOnData(sender: AnyObject) {

    var quoteInputText = quoteInput.text

    var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
    var context:NSManagedObjectContext = appDel.managedObjectContext!

    var newQuote = NSEntityDescription.insertNewObjectForEntityForName("BookArray", inManagedObjectContext: context) as! BookArray

    newQuote.myFirstBook = quoteInputText

    context.save(nil)

    println(newQuote)

}

3) Change the unwrapping part of your viewDidLoad function to:

if (bookArray.count != 0){
    var randomIndex = Int(arc4random_uniform(UInt32(bookArray.count)))
    let bookArrayInstance = bookArray[randomIndex] as! BookArray
    quoteTextField.text = bookArrayInstance.myFirstBook
   }
}

edited Jul 15, 2015 at 11:53

answered Jul 14, 2015 at 20:47

Andriy Gordiychuk

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15 Comments

Skalwalker Over a year ago

I tried what you suggested it didn't work. BookArray is an entity on the core data

Andriy Gordiychuk Over a year ago

You should call bookArrayInstance.myFirstBook. This is the string property which you have.

Skalwalker Over a year ago

Yes, but he is complaining here: let bookArrayInstance = bookArray[randomIndex] as! BookArray as Use of undeclared type "BookArray"

Andriy Gordiychuk Over a year ago

So you didn't define a class for your BookArray?

Andriy Gordiychuk Over a year ago

How do you the save your user input? You did mention that it works

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