For some reason when I put my code for my NSTableView in a ViewController, none of the cells appear, but if I put the code in the AppDelegate, everything works great.
Any ideas as to why this is happening? I'm working with a .xib file if that helps at all.
class ViewController: NSViewController{
var delegate: AppDelegate? = nil
#IBOutlet weak var tableView: NSTableView!
override func viewDidLoad() {
super.viewDidLoad()
delegate = NSApplication.shared.delegate as? AppDelegate
tableView.dataSource = self
tableView.delegate = self
}
}
extension ViewController: NSTableViewDataSource{
func numberOfRows(in tableView: NSTableView) -> Int {
print(delegate?.FlightList.count ?? 0)
return delegate?.FlightList.count ?? 0
}
}
extension ViewController: NSTableViewDelegate{
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
var text: String = ""
var cellIdentifier: String = ""
guard let item = delegate?.FlightList[row] else {
return nil
}
if tableColumn == tableView.tableColumns[0] {
text = item.flightName
cellIdentifier = "flightID"
}
if let cell = tableView.makeView(withIdentifier: NSUserInterfaceItemIdentifier(cellIdentifier), owner: nil) as? NSTableCellView {
cell.textField?.stringValue = text
return cell
}
return nil
}
}
you need to implement the NSTableViewDataSource, NSTableViewDelegate protocols to tell the table this is the class its getting data from else the
tableView.dataSource = self
tableView.delegate = self
wont work and then you wont need to use the app delegate
Related
I have created a xib cell with two textfields. The textfield are connected as IBoutlets to the xib swift file. The xib cell is registered on the view controller as a Nib. When I run the app on a simulator I cannot get the keyboard to show up. Secondly, the textfields are not editable at all, that is the cursor doesn't even show. I would like to get help with this as I have tried using a label the same thing happens. I'm just not sure how to fix this one. I'm not getting errors on build. I have installed IQKeyboardManager from cocoapods. Thanks in advance.
Heres the code:
import UIKit
class DictionaryCell: UITableViewCell {
#IBOutlet weak var DictBubble: UIView!
#IBOutlet weak var DictSymbolTextfield: UITextField!
#IBOutlet weak var SymbolMeaningTextfield: UITextView!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
Here is the view controller code:
import UIKit
import Firebase
class PersonalDreamDictionaryViewController: UIViewController, UITextViewDelegate {
#IBOutlet weak var tableView: UITableView!
#IBOutlet weak var dictionaryTextfield: UITextField!
let db = Firestore.firestore()
var dreamDictionary: [DreamDictionary] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
tableView.dataSource = self
tableView.delegate = self
title = K.Dictionary.appName
tableView.register(UINib(nibName: K.Dictionary.cellNibName, bundle: nil), forCellReuseIdentifier:
K.Dictionary.cellIdentifier)
loadDictionaryList()
}
func loadDictionaryList() {
db.collection(K.Fstore1.collectionName)
.order(by: K.Fstore1.date)
.addSnapshotListener{ (QuerySnapshot, error) in
self.dreamDictionary = []
if let e = error {
print("There was an issue retrieving data from Firestore. \(e)")
} else {
if let snapshotDocuments = QuerySnapshot?.documents {
for doc in snapshotDocuments {
//print(doc.data())
let data = doc.data()
if let symbolRetrieved = data[K.Fstore1.symbol] as? String, let meaningRetrieved = data[K.Fstore1.meaning] as? String {
let newDictList = DreamDictionary(mysymbol: symbolRetrieved, mymeaning: meaningRetrieved)
self.dreamDictionary.append(newDictList)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
}
}
}
}
}
extension PersonalDreamDictionaryViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dreamDictionary.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let dictCell = tableView.dequeueReusableCell(withIdentifier: K.Dictionary.cellIdentifier, for: indexPath)
as! DictionaryCell
if let symbolInput = dictCell.DictSymbolTextfield.text, let meaningInput = dictCell.SymbolMeaningTextfield.text { db.collection(K.Fstore1.collectionName).addDocument(data: [
K.Fstore1.symbol: symbolInput,
K.Fstore1.meaning: meaningInput,
K.Fstore1.date: Date().timeIntervalSince1970
]) { (error) in
if let e = error {
print("There was an issue saving data to firesore, \(e)")
} else {
print("Successfully saved data.")
}
}
}
return dictCell
}
}
extension PersonalDreamDictionaryViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, willBeginEditingRowAt indexPath: IndexPath) {
print(indexPath.row)
}
}
I am trying to reload a table view with the help of a delegate. I found tons of examples here on stack overflow, but I always end up with an error.
My first controller which should update the table view:
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var tableView: NSTableView!
var tableViewData: [[String:String]] = []
override func viewDidLoad() {
super.viewDidLoad()
...
self.tableView.delegate = self as NSTableViewDelegate
self.tableView.dataSource = self
self.tableView.reloadData()
}
override var representedObject: Any? {
didSet {
}
}
func reloadTableData(_ notification: Notification) {
tableView.reloadData()
}
}
extension ViewController: NSTableViewDataSource, NSTableViewDelegate {
func numberOfRows(in tableView: NSTableView) -> Int {
return tableViewData.count
}
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView?{
var result:CustomTableCellview
result = tableView.make(withIdentifier: (tableColumn?.identifier)!, owner: self) as! CustomTableCellview
result.textField?.stringValue = tableViewData[row][(result.textField?.identifier!)!]!
result.secondTextField?.stringValue = tableViewData[row][result.secondTextField.identifier!]!
return result
}
}
extension ViewController: PageControllerDelegate {
func updateTableData() {
tableView.reloadData()
}
}
My second controller, which should tell the first one it can update the table view:
import Cocoa
protocol PageControllerDelegate {
func updateTableData()
}
class PageController: NSPageController {
var delegate: PageControllerDelegate?
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func saveData(sender: NSButton) {
...
delegate?.updateTableData()
self.dismiss(self)
}
}
Within the PageController I get the following error:
Property 'delegate' with type 'PageControllerDelegate?' cannot override a property with type 'NSPageControllerDelegate?' (aka 'Optional<NSPageControllerDelegate>')
Rename the delegate protocol name to something like MyPageControllerDelegate. It seems like there is already something called PageControllerDelegate that is defined either by you, or Apple
NSPageController already has a property delegate of type NSPageControllerDelegate. Remove var delegate: PageControllerDelegate?.
I am a newbie and learning ios programming. I have made a custom table view cell. I am trying to append data in it via user defaults but its not storing the data, every time i go back the app refreshes making the table view blank screen.
// data sent from here
class ViewController: UIViewController {
#IBOutlet weak var textfield: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func submit(_ sender: AnyObject) {
performSegue(withIdentifier: "move", sender: nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let destination = segue.destination as? secondviewcontroller
destination?.list.append(textfield.text!)
let defaults = UserDefaults.standard
defaults.set(destination?.list, forKey: "listarray")
UserDefaults.standard.synchronize()
}
}
// here i want to retreive
class secondviewcontroller: UIViewController {
#IBOutlet weak var tblView: UITableView!
var list = ["fahad","Ali","tahir"]
var abc = ""
override func viewDidLoad() {
super.viewDidLoad()
tblView.dataSource = self;
tblView.delegate = self;
let storedarray = UserDefaults.standard.object(forKey: "listarray")
print("hi\(storedarray)")
}
override func viewDidAppear(_ animated: Bool) {
tblView.register(TableViewCell.self, forCellReuseIdentifier: "TableViewCell")
tblView.reloadData()
}
#IBAction func backbtn(_ sender: AnyObject) {
dismiss(animated: true, completion: nil)
}
}
import UIKit
class secondviewcontroller: UIViewController {
#IBOutlet weak var tblView: UITableView!
var list = ["fahad","Ali","tahir"]
var abc = ""
override func viewDidLoad() {
super.viewDidLoad()
tblView.dataSource = self;
tblView.delegate = self;
}
override func viewDidAppear(_ animated: Bool) {
tblView.register(TableViewCell.self, forCellReuseIdentifier: "TableViewCell")
let storedarray = UserDefaults.standard.object(forKey: "listarray")
print("hi\(storedarray)")
tblView.reloadData()
}
#IBAction func backbtn(_ sender: AnyObject) {
dismiss(animated: true, completion: nil)
}
}
extension secondviewcontroller : UITableViewDataSource , UITableViewDelegate{
func numberOfSections(in tableView: UITableView) -> Int {
return 1;
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print (list)
return list.count;
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCell(withIdentifier: "TableViewCell", for: indexPath) as! TableViewCell;
cell.textlabel.text = list[indexPath.row];
return cell;
}
}
// my custom table view
import UIKit
class TableViewCell: UITableViewCell {
#IBOutlet weak var textlabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
}
My UI storyboardgetting this error
you must subclass the UITableViewDelegate and UITableViewDataSource methods and implement the required methods for it to display the data in your custom view.
refer to this: http://clean-swift.com/refactoring-table-view-data-source-and-delegate-methods/
try adding the code for stored array into the viewwillappear method..
These lines recreates the same list with an new element without considering the saved items:
destination?.list.append(textfield.text!)
let defaults = UserDefaults.standard
defaults.set(destination?.list, forKey: "listarray")
UserDefaults.standard.synchronize()
You should instead:
let newEntry = textfield.text!
let defaults = UserDefaults.standard
if destination?.list.count == 3 { //3 because you hardcoded 3 items in next controller
destination?.list.append(newEntry)
} else {
let obj = defaults.object(forKey: "listarray") as? [String] ?? [String]()
destination?.list = obj.append(newEntry)
}
defaults.set(destination?.list, forKey: "listarray")
UserDefaults.standard.synchronize()
I'm currently trying to parse the reddit headlines from a specific subreddit and display these in an NSTableView. The thing is, the numberOfRows function gets called and returns the correct integer but the tableView delegate function never gets called.
As far as I can see everything is wired up correctly in the code.
ViewController:
#IBOutlet weak var tableView: NSTableView!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
Downloader.load(url: URL(string: "https://www.reddit.com/r/" + "gaming" + ".json")!){
(result) in
let tvc = TableViewController(data: result)
self.tableView.delegate = tvc
self.tableView.dataSource = tvc
self.tableView.reloadData()
}
}
TableViewController:
class TableViewController: NSObject{
var json: JSON!
init(data: JSON) {
super.init()
self.json = data
}
}
extension TableViewController : NSTableViewDataSource {
func numberOfRows(in tableView: NSTableView) -> Int {
return JSONFormatController.getTitlesFrom(json: json).count
}
}
extension TableViewController : NSTableViewDelegate {
func tableView(_ tableView: NSTableView, viewFor tableColumn: NSTableColumn?, row: Int) -> NSView? {
var titles = JSONFormatController.getTitlesFrom(json: json)
if let cell = tableView.make(withIdentifier: "entry", owner: nil) as? NSTableCellView {
cell.textField?.stringValue = titles[row]
return cell
} else {
return nil
}
}
}
The result variable and getTitlesFrom method do work, I checked these.
I think your issue is that your TableViewController object is getting deallocated because you are not keeping a reference to it. Try this:
#IBOutlet weak var tableView: NSTableView!
var tvc : TableViewController!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
Downloader.load(url: URL(string: "https://www.reddit.com/r/" + "gaming" + ".json")!){
(result) in
self.tvc = TableViewController(data: result)
self.tableView.delegate = self.tvc
self.tableView.dataSource = self.tvc
self.tableView.reloadData()
}
}
Explanation: tvc is a local variable of the download block which is getting deallocated after it has executed. Presumably your assumption is that storing the tvc in delegate and/or dataSource is keeping tvc alive. But they are not, they are weak references.
I'm currently working on an inventory app that will hold information for two entities. The first entity holds two attributes "site name" and "site address". second entity holds "itemName" "itemQuantity" and "item picture". I'm able to save the data to core data. I'm having issues with fetching the data right now. Does any one know how to pass data between the view controllers.
I'm uploading the site view controller, detail view controller, and my new item view controller.
class SiteTableViewController: UIViewController {
var managedContext : NSManagedObjectContext = CoreDataHelper.sharedInstance.myContext
var sites : [Site]? = [Site]()
//variable to hold selected site
var selectedSite : Site?
let myCellIdentifier = "cell"
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
// Do any additional setup after loading the view.
sites = [Site]()
reloadData()
automaticallyAdjustsScrollViewInsets = false
//let barButtonItem = UIBarButtonItem(barButtonSystemItem: .Compose, target: self, action: "addSite:")
//self.navigationItem.leftBarButtonItems = [barButtonItem]
}
//load new data into table
func reloadData() {
let fetchRequest = NSFetchRequest(entityName: "Site")
let sortDescriptor = NSSortDescriptor(key: "siteName", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptor]
do {
sites = try self.managedContext.executeFetchRequest(fetchRequest) as! [Site]
tableView.reloadData()
} catch {
print("Error fetching objects")
}
tableView.reloadData()
}
override func viewWillAppear(animated: Bool) {
reloadData()
}
}
extension SiteTableViewController: UITableViewDataSource, UITableViewDelegate {
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(myCellIdentifier, forIndexPath: indexPath)
let site = sites![indexPath.row]
cell.textLabel?.text = site.valueForKey("siteName") as? String
cell.detailTextLabel?.text = site.valueForKey("siteAddress") as? String
return cell
}
func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
if editingStyle == .Delete {
let logItemToDelete = sites![indexPath.row]
sites?.removeAtIndex(indexPath.row)
managedContext.deleteObject(logItemToDelete)
do {
try managedContext.save()
} catch {
print("Could not save or delete object")
}
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: .Fade)
}
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return sites!.count
}
// func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//
// selectedSite = sites![indexPath.row]
//
// }
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "detailSegue" {
var nextVC = segue.destinationViewController as! DetailTableViewController
var selectedItem : Site = sites![self.tableView.indexPathForSelectedRow!.row] as Site
fetchSite = selectedItem.valueForKey("siteName") as? NSManagedObject
nextVC.valueToPass = selectedItem.siteName!
}
}
}
here is my detail view controller
import UIKit
import CoreData
public var fetchSite : NSManagedObject?
class DetailTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
var holdSiteData: NSMutableArray = NSMutableArray()
var managedContext : NSManagedObjectContext = CoreDataHelper.sharedInstance.myContext
#IBOutlet weak var tableView: UITableView!
var sites : [Site]!
//string to hold fetchResults controll
//open string to hold siteName
var valueToPass = ""
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.title = "\(valueToPass)"
// Do any additional setup after loading the view.
tableView.delegate = self
tableView.dataSource = self
automaticallyAdjustsScrollViewInsets = false
tableView.estimatedRowHeight = 75.0
tableView.rowHeight = UITableViewAutomaticDimension
retrieveItemRelationship()
}
override func viewWillAppear(animated: Bool) {
retrieveItemRelationship()
}
func retrieveItemRelationship() {
// fetchSite.setValue(NSSet(keyCommands), forKey: "test")
let fetchRequest = NSFetchRequest(entityName: "SiteItem")
let sortDescriptors = NSSortDescriptor(key: "itemName", ascending: true)
fetchRequest.sortDescriptors = [sortDescriptors]
do {
let result = try fetchSite?.managedObjectContext?.executeRequest(fetchRequest)
} catch let error as NSError {
print(error)
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! TableViewCell
// let cellInfo = fetchedResultsController.objectAtIndexPath(indexPath) as! SiteInfo
cell.cellName?.text = "Test"
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return holdSiteData.count
}
}
this is my last view to save the data to. I figured i need to pass the data here then associate the two entities so that I can save it correctly. For instance, for site name "Staples Center". I need to pull this over to the final view controller then save the information to this object.
import UIKit
import CoreData
class ItemNewViewController: UIViewController, UIPickerViewDataSource, UIPickerViewDelegate, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
//var managedObjectContext : NSManagedObjectContext!
var managedContext : NSManagedObjectContext = CoreDataHelper.sharedInstance.myContext
//categories array for picker view
var categories = ["Building Materials", "Electrical", "Cleaning Products",
"Tools & Hardware", "Plumbing", "Paint", "Appliances", "Other"]
//textFields
#IBOutlet weak var itemNameTextField: UITextField!
#IBOutlet weak var quantityTextField: UITextField!
#IBOutlet weak var imageView: UIImageView!
//Label properties
#IBOutlet weak var newItemLabel: UILabel!
#IBOutlet weak var quantityLabel: UILabel!
#IBOutlet weak var categoryLabel: UILabel!
//pickerLabel
#IBOutlet weak var pickerListIcon: UIPickerView!
//clicker property label and textlabel for number
#IBOutlet weak var increaseNumberClicker: UIStepper!
#IBOutlet weak var numberFieldClicker: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
//label property customize view code
newItemLabel.layer.masksToBounds = true
newItemLabel.layer.borderWidth = 2.0
newItemLabel.layer.borderColor = UIColor.whiteColor().CGColor
newItemLabel.layer.cornerRadius = 6
//label property customize view code
quantityLabel.layer.masksToBounds = true
quantityLabel.layer.borderWidth = 2.0
quantityLabel.layer.borderColor = UIColor.whiteColor().CGColor
quantityLabel.layer.cornerRadius = 6
//lable property customize view code
categoryLabel.layer.masksToBounds = true
categoryLabel.layer.borderWidth = 3.0
categoryLabel.layer.borderColor = UIColor.whiteColor().CGColor
categoryLabel.layer.cornerRadius = 6
//label picker customize view
pickerListIcon.layer.masksToBounds = true
pickerListIcon.layer.borderWidth = 3.0
pickerListIcon.layer.borderColor = UIColor.whiteColor().CGColor
pickerListIcon.layer.cornerRadius = 6
pickerListIcon.layer.backgroundColor = UIColor.blackColor().CGColor
self.pickerListIcon.dataSource = self
self.pickerListIcon.delegate = self
numberFieldClicker.enabled = false
//UIStepper value
increaseNumberClicker.wraps = true
increaseNumberClicker.autorepeat = true
increaseNumberClicker.layer.masksToBounds = true
increaseNumberClicker.layer.borderWidth = 3.0
increaseNumberClicker.layer.borderColor = UIColor.whiteColor().CGColor
increaseNumberClicker.layer.cornerRadius = 6
increaseNumberClicker.layer.backgroundColor = UIColor.blackColor().CGColor
//below code declares a variable that inherits from UITapGesture
//this allows the image view to be an action
//*Make sure you enable user interaction in storyBoard very IMPORTANT!
let imageTapRecognizer = UITapGestureRecognizer(target: self, action: "enableImage")
self.imageView.addGestureRecognizer(imageTapRecognizer)
}
// below function allows the camera view to be accessible
func enableImage(){
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) {
let cameraView = UIImagePickerController()
cameraView.sourceType = UIImagePickerControllerSourceType.Camera
cameraView.delegate = self
self.presentViewController(cameraView, animated: true, completion: nil)
}
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
self.imageView.image = image
picker.dismissViewControllerAnimated(true, completion: nil)
}
//function used to increase UIStepper. increment by integers of one
#IBAction func clickerIncreaser(sender: UIStepper) {
numberFieldClicker.text = Int(sender.value).description
}
func numberOfComponentsInPickerView(pickerView: UIPickerView) -> Int {
return 1
}
func pickerView(pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
return categories.count
}
func pickerView(pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
return categories[row]
}
func pickerView(pickerView: UIPickerView, attributedTitleForRow row: Int, forComponent component: Int) -> NSAttributedString? {
//passing the categorories array into the new constant myCategoriesArray
let myCategoriesArray = categories[row]
let myTextColor = NSAttributedString(string: myCategoriesArray, attributes: [NSForegroundColorAttributeName: UIColor.whiteColor()])
return myTextColor
}
//save data to core data
#IBAction func saveButton(sender: AnyObject) {
if (itemNameTextField.text?.isEmpty)! {
let displayAlertController = UIAlertController(title: "Form Incomplete", message: "Please provide item with a name", preferredStyle: .Alert)
let okButton : UIAlertAction = UIAlertAction(title: "OK", style: .Default, handler: nil)
displayAlertController.addAction(okButton)
self.presentViewController(displayAlertController, animated: true, completion: nil)
} else {
//declare site object and object
let siteInfoEntity = NSEntityDescription.entityForName("SiteItem", inManagedObjectContext: self.managedContext)
//declare item and item object
let siteObject = SiteItem(entity: siteInfoEntity!, insertIntoManagedObjectContext: self.managedContext)
//convert String to Integer
let quantityNumber: Int? = Int(quantityTextField.text!)
siteObject.setValue(itemNameTextField.text?.capitalizedString, forKey: "itemName")
siteObject.setValue(quantityNumber, forKey: "itemQnty")
fetchSite?.setValue(NSSet(object: siteObject), forKey: "reverseItems")
self.managedContext.saveOrLogError()
self.navigationController?.popViewControllerAnimated(true)
}
}
}
Once again if someone can point me in the right direction for saving my relationships to core data and retrieving these relationships would be great. Still new to core data so need all the help i can get!
Thank you
Your detail controller can have a property Site. In prepareForSegue you pass the selected Site object to the detail controller.
Both the site list and the list of items should be backed by NSFetchedResultsController, not in-memory arrays.