I've searched over the internet (mostly here) about my issue and I've tried them but I still can't get this to work. I'm trying to retrieve the image from the core data and then display it on a table view. So basically, a table view with a thumbnail image along with a name and a switch. I have the following swift files below. Can anyone lead me what to do? Aside from the image retrieving, I'm planning to add a switch that when turned on/off it asks for a password so that it can be switched on/off. How can I start this? Hoping for your kind responses. Thank you!
I have this snippet of code for saving a record including an image to core data.
let mOC =
(UIApplication.sharedApplication().delegate
as! AppDelegate).managedObjectContext
@IBOutlet weak var firstName: UITextField!
@IBOutlet weak var lastName: UITextField!
@IBOutlet weak var status: UILabel!
@IBAction func saveRecord(sender: AnyObject) {
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: mOC)
let faculty = Faculty(entity: entityDescription!,
insertIntoManagedObjectContext: mOC)
faculty.firstname = firstName.text
faculty.lastname = lastName.text
let pickedImage = UIImageJPEGRepresentation(imageView.image!, 1.0)
faculty.image = pickedImage
do {
try mOC.save()
firstName.text = ""
lastName.text = ""
status.text = "New record saved."
NSNotificationCenter.defaultCenter().postNotificationName("load", object: nil)
self.dismissViewControllerAnimated(true, completion: nil)
} catch {
status.text = "Record not saved."
}
}
@IBOutlet weak var imageView: UIImageView!
var newMedia : Bool?
@IBAction func choosePhoto(sender: AnyObject) {
if UIImagePickerController.isSourceTypeAvailable(
UIImagePickerControllerSourceType.SavedPhotosAlbum) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.sourceType =
UIImagePickerControllerSourceType.PhotoLibrary
imagePicker.mediaTypes = [kUTTypeImage as String]
imagePicker.allowsEditing = false
self.presentViewController(imagePicker, animated: true,
completion: nil)
newMedia = false
}
}
This is the TableViewController which displays the records on the table view and supposedly with the image, the one I'm trying to figure out.
let managedObjectContext =
(UIApplication.sharedApplication().delegate
as! AppDelegate).managedObjectContext
var fetchedLastName = [String]()
var fetchedFirstName = [String]()
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil)
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
}
} else {
}
}
catch{}
}
func reloadData(notification: NSNotification){
fetchedLastName.removeAll()
fetchedFirstName.removeAll()
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
}
} else {
}
}
catch{}
self.tableView.reloadData()
}
Am I right to think that it is somewhere here that I should write the code to retrieve the image from the core data and display it on the table view?
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell
let row = indexPath.row
cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row]
return cell
}
Ok here is the fixed code:
TeachTableViewController:
//
// TEACHTableViewController.swift
// TEACH
//
// Created by ICST340.N1 on 9/29/15.
// Copyright © 2015 IyoTugs. All rights reserved.
//
import UIKit
import CoreData
class TEACHTableViewController: UITableViewController {
let managedObjectContext =
(UIApplication.sharedApplication().delegate
as! AppDelegate).managedObjectContext
var fetchedLastName = [String]()
var fetchedFirstName = [String]()
var fetchedImage = [UIImage]()
override func viewDidLoad() {
super.viewDidLoad()
NSNotificationCenter.defaultCenter().addObserver(self, selector: "reloadData:",name:"load", object: nil)
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
//added this is convert the image
let image = match.valueForKey("image") as! NSData
fetchedImage.append(UIImage(data: image)!)
}
} else {
}
}
catch{}
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncommented this
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
func reloadData(notification: NSNotification){
fetchedLastName.removeAll()
fetchedFirstName.removeAll()
//Added this to remove all images
fetchedImage.removeAll()
let entityDescription =
NSEntityDescription.entityForName("Faculty",
inManagedObjectContext: managedObjectContext)
let request = NSFetchRequest()
request.entity = entityDescription
do{
let objects = try managedObjectContext.executeFetchRequest(request)
let results = objects
if results.count > 0 {
for var i = 0; i < results.count; i += 1{
let match = results[i] as! NSManagedObject
fetchedLastName.append((match.valueForKey("lastname") as? String)!)
fetchedFirstName.append((match.valueForKey("firstname") as? String)!)
//added this is convert the image
let image = match.valueForKey("image") as! NSData
fetchedImage.append(UIImage(data: image)!)
}
} else {
}
}
catch{}
self.tableView.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return fetchedLastName.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("TEACH", forIndexPath: indexPath) as! TEACHTableViewCell
let row = indexPath.row
print(fetchedFirstName)
cell.facultyName.text = fetchedLastName[row] + ", " + fetchedFirstName[row]
cell.facultyImage.image = fetchedImage[row]
return cell
}
}
I marked each spot that I fixed, but there were only four spots. Two of them had to do with taking the NSData and turning it into an Image(in viewDidLoad and reloadData, same spots). One of them add to do with commenting out the line that made the right navbar button an edit button. And the last one fetchedImage.removeAll() on the top of reloadData to take out all of the images.