My swift code below uses textFieldDidEndEditing as a way to fetch a string saved into coredata. So if the user enters 1 the first entry that was saved into core data should abppear the label labelName. That is all that should happen I just dont know how to user the nspredicate listed below. Look at func textFieldDidEndEditing.
import UIKit
import CoreData
class ViewController: UIViewController,UITextFieldDelegate {
@IBOutlet var labelName : UILabel!
@IBOutlet var enterT : UITextField!
// MARK: Variables declearations
let appDelegate = UIApplication.shared.delegate as! AppDelegate //Singlton instance
var context:NSManagedObjectContext!
// MARK: View Controller life cycle methods
override func viewDidLoad() {
super.viewDidLoad()
openDatabse()
}
// MARK: Methods to Open, Store and Fetch data
func textFieldDidEndEditing(_ textField: UITextField) {
NSPredicate(format: "index == %ld", Int(enterT.text!) ?? 0)
//use this to place the the first string from username on labelname if one is entered
}
func openDatabse()
{
context = appDelegate.persistentContainer.viewContext
let entity = NSEntityDescription.entity(forEntityName: "Users", in: context)
let newUser = NSManagedObject(entity: entity!, insertInto: context)
let newUser2 = NSManagedObject(entity: entity!, insertInto: context)
let newUser3 = NSManagedObject(entity: entity!, insertInto: context)
saveData(UserDBObj: newUser, UserDBObj2: newUser2, UserDBObj3: newUser3)
}
func saveData(UserDBObj:NSManagedObject,UserDBObj2:NSManagedObject,UserDBObj3:NSManagedObject)
{
UserDBObj.setValue("kim kardashian", forKey: "username")
UserDBObj2.setValue("jessica biel", forKey: "username")
UserDBObj3.setValue("Hailey Rienhart", forKey: "username")
print("Storing Data..")
do {
try context.save()
} catch {
print("Storing data Failed")
}
fetchData()
}
func fetchData()
{
print("Fetching Data..")
let request = NSFetchRequest<NSFetchRequestResult>(entityName: "Users")
request.returnsObjectsAsFaults = false
do {
let result = try context.fetch(request)
for data in result as! [NSManagedObject] {
let userName = data.value(forKey: "username") as! String
print("User Name is : "+userName)
}
} catch {
print("Fetching data Failed")
}}}