NameInput.swift

//
//  NameInput.swift
//  Collaborative_Reading_App_3
//
//  Created by Student on 2017-04-19.
//  Copyright © 2017 Student. All rights reserved.
//

import UIKit
import CoreData

class NameInput: UIViewController, UITextFieldDelegate {

    //outlet for the text field
    @IBOutlet weak var nameInput: UITextField!
    //outlet for next button
    @IBOutlet weak var nextButton: UIButton!
    
    //used for core data
    let managedObjectContext = (UIApplication.shared.delegate
        as! AppDelegate).persistentContainer.viewContext
    
    override func viewDidLoad() {
        super.viewDidLoad()
        nameInput.delegate = self
        
      nextButton.isEnabled = false
        
        // Do any additional setup after loading the view.
        
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(self.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    
    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

    func textFieldDidBeginEditing(_ textField: UITextField) {
           nextButton.isEnabled = true
    
}
    func keyboardWillShow(notification: NSNotification) {
        //for setting up the keyboard and showing it
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0{
                self.view.frame.origin.y -= keyboardSize.height
            }
        }
    }
    
    func keyboardWillHide(notification: NSNotification) {
        //for hiding the keyboard
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y != 0{
                self.view.frame.origin.y += keyboardSize.height
            }
        }
    }
    
    //action for the button
    @IBAction func goToNext(_ sender: UIButton) {
        //performs a segue from name view controller to the avater selection
        performSegue(withIdentifier: "goToNext", sender: self)
        
        
        //CORE DATA
        let entityDescription = NSEntityDescription.entity(forEntityName: "UserInfo",
                                       in: managedObjectContext)
        
        let contact = UserInfo(entity: entityDescription!,
                               insertInto: managedObjectContext)
        
        contact.name = nameInput.text!
        
        do {
            try managedObjectContext.save()
            print("Saved Name")
            
        } catch {
            print("Error")
        }
    }
    
    //func that allows passing data with the segue
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

        let destination = segue.destination as! AvatarSelection
        //sets the variable passedData (an empty string from avaterselction swift file) as the text inputted
        destination.passedData = nameInput.text!
    }
}