Saving an integer in core data - ios

Question

Overview
I need to save several TextFields into CoreData, but only the first one (Seen as pickerView below) saves and prints correctly. The others do not save correctly, for instance, when I try to save the integer ones, I get an error saying that they cannot take a String, which makes sense. I just cannot find a way to fix the integer-string issue. The other error occurs when I attempted to cast everything as a string ( mainly because I won't need to do any arithmetic on it, so it doesn't matter ), and it just gives me a breaking point in the saveButton function.
What I would like to know
What I ultimately need is the ability to save all of these TextFields into CoreData so that I can later retrieve them. I appreciate the help in advance. Thank you!
NOTE
I am including the entire ( or most of ) the ViewController.swift file so that you can see how I am declaring things and then how they are being called. The code in question is located in the saveButton action at the bottom of the code block.
CODE
#IBOutlet weak var locationOfMachine: UITextField!
#IBOutlet weak var engineHours: UITextField!
#IBOutlet weak var YOM: UITextField!
#IBOutlet weak var serialNo: UITextField!
#IBOutlet weak var modelName: UITextField!
#IBOutlet weak var pickerTextField: UITextField!
var pickOption = ["Wirtgen","Kleeman","Hamm","Vögele"]
override func viewDidLoad() {
super.viewDidLoad()
var pickerView = UIPickerView()
pickerView.delegate = self
pickerTextField.inputView = pickerView
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
#IBAction func saveButton(sender: AnyObject)
{
var appDel: AppDelegate = (UIApplication.sharedApplication().delegate as! AppDelegate)
var context:NSManagedObjectContext = appDel.managedObjectContext
var entity1 = NSEntityDescription.insertNewObjectForEntityForName("UsedInfo", inManagedObjectContext:context) as NSManagedObject
entity1.setValue(pickerTextField.text, forKey: "product")
entity1.setValue(modelName.text, forKey:"modelName")
entity1.setValue(serialNo.text, forKey:"serialNo")
entity1.setValue(Int(YOM.text!), forKey:"yom")
entity1.setValue(engineHours.text, forKey:"engineHours")
entity1.setValue(locationOfMachine.text, forKey:"location")
print(entity1.valueForKey("product"))
print(entity1.valueForKey("modelName"))
print(entity1.valueForKey("serialNo"))
print(entity1.valueForKey("yom"))
print(entity1.valueForKey("engineHours"))
do {
try context.save()
}
catch {
print("error")
}
}
EDIT
Upon trying to save everything as just a string, since i only need to retrieve it, I run into this issue:
entity1.setValue(pickerTextField.text, forKey: "product")
entity1.setValue(modelName.text, forKey:"modelName")
entity1.setValue(serialNo.text, forKey:"serialNo") <-Thread1:Breakpoint1.1
entity1.setValue(YOM.text, forKey:"yom")
entity1.setValue(engineHours.text, forKey:"engineHours")
entity1.setValue(locationOfMachine.text, forKey:"location")
print(entity1.valueForKey("product"))
print(entity1.valueForKey("modelName"))
print(entity1.valueForKey("serialNo"))
print(entity1.valueForKey("yom"))
print(entity1.valueForKey("engineHours"))
I also get "(lldb)" in the debugger window.

Answer 1

I'll just show you how to get int from string. Use it accordingly:
var aString = "0000" // var aString = textField.text!
var numFromString = Int(aString)
You can assign the text field to aString and convert it to Int like i showed you.

Answer 2

For things that don't need arithmetic, define them as strings in Core Data. For other numbers, it should work to do as you have with Int(YOM.text!).
However, I suggest that you create a managed object subclass for "UsedInfo" so that you can work directly with its properties instead of using setValue:forKey:. The benefit of a subclass is that it will show you data types explicitly.

Answer 3

Validate all textfields before trying to store,set the appropriate keyboard for each textfield and provide the valid character set for each textfield.
For Example:
YOM text field : Use Keyboard with only integers.
Valid character set are 0 to 9
And validation for min and max if applicable.
If any of the validation criteria fails ,throw an alert to input valid data.
I guess this solves your issue.