I am making a cocktail iOS application.
I am adding strings to a tableview (an ingredient to the "cabinet"). The user enters an ingredient and then presses the button ADD. It successfully adds it to the Core Data but it does not appear right away. What am I doing wrong?
Below is my code, thanks!
ViewController:
import UIKit
import CoreData
class CabinetViewController: UIViewController, UITextFieldDelegate, UITableViewDataSource, UITableViewDelegate {
var ingredientArray = [String]()
var display = [String]()
var dbIngredients = [String]()
let ingredientFetch = NSFetchRequest(entityName: "Cabinet")
var fetchedIngredient = [Cabinet]()
#IBOutlet weak var TextUI: UITextField!
#IBOutlet weak var Button: UIButton!
#IBOutlet weak var TableView: UITableView!
let moc = DataController().managedObjectContext
override func viewDidLoad() {
super.viewDidLoad()
TextUI.delegate = self
TextUI.addTarget(self, action: "textFieldDidChange:", forControlEvents: UIControlEvents.EditingChanged)
TableView.delegate = self
TableView.dataSource = self
TableView.registerClass(UITableViewCell.self,
forCellReuseIdentifier: "Cell")
// fetch Core Data
do{
fetchedIngredient = try moc.executeFetchRequest(ingredientFetch) as! [Cabinet]
} catch {
fatalError()
}
let postEndpoint: String = "http://www.thecocktaildb.com/api/json/v1/1/list.php?i=list"
guard let url = NSURL(string: postEndpoint) else {
print("Error: cannot create URL")
return
}
let urlRequest = NSURLRequest(URL: url)
let config = NSURLSessionConfiguration.defaultSessionConfiguration()
let session = NSURLSession(configuration: config)
let task = session.dataTaskWithRequest(urlRequest, completionHandler: { (data, response, error) in
guard let responseData = data else {
print("Error: did not receive data")
return
}
guard error == nil else {
print("error calling GET on www.thecocktaildb.com")
print(error)
return
}
let post: NSDictionary
do {
post = try NSJSONSerialization.JSONObjectWithData(responseData,
options: []) as! NSDictionary
} catch {
print("error trying to convert data to JSON")
return
}
var count = 1
if let drinks = post["drinks"] as? [NSDictionary] {
for drink in drinks {
if let strIngredient = drink["strIngredient1"] as? String {
print(String(count) + ". " + strIngredient)
self.dbIngredients.append(strIngredient)
count++
}
}
}
})
task.resume()
TableView.reloadData()
}
func textFieldDidChange(textField: UITextField) {
search(self.TextUI.text!)
}
func textField(textField: UITextField, shouldChangeCharactersInRange range: NSRange, replacementString string: String) -> Bool {
Button.addTarget(self, action: "buttonPressed:", forControlEvents: .TouchUpInside)
return true
}
func buttonPressed(sender: UIButton!) {
//ingredientArray.append(TextUI.text!)
let entity = NSEntityDescription.insertNewObjectForEntityForName("Cabinet", inManagedObjectContext: moc) as! Cabinet
entity.setValue(TextUI.text!, forKey: "ingredient")
do{
try moc.save()
}catch {
fatalError("failure to save context: \(error)")
}
showAlertButtonTapped(Button)
// dispatch_async(dispatch_get_main_queue(), { () -> Void in
// self.TableView.reloadData()
// })
}
#IBAction func showAlertButtonTapped(sender: UIButton) {
// create the alert
let alert = UIAlertController(title: "Added!", message: "You've added " + TextUI.text! + " to your cabinet", preferredStyle: UIAlertControllerStyle.Alert)
// add an action (button)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
// show the alert
self.presentViewController(alert, animated: true, completion: nil)
}
func search(str:String) {
display.removeAll(keepCapacity: false)
for s in dbIngredients{
if s.hasPrefix(str){
display.append(s)
print(s)
}
}
}
func tableView(tableView: UITableView,
numberOfRowsInSection section: Int) -> Int {
return fetchedIngredient.capacity
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
do{
let fetchedIngredient = try moc.executeFetchRequest(ingredientFetch) as! [Cabinet]
cell.textLabel?.text = fetchedIngredient[indexPath.row].ingredient
} catch {
fatalError("bad things happened: \(error)")
}
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: true)
let alert = UIAlertController(title: "Remove " + fetchedIngredient[indexPath.row].ingredient!,
message: "No more " + fetchedIngredient[indexPath.row].ingredient! + " in your cabinet?",
preferredStyle: .Alert)
let deleteAction = UIAlertAction(title: "Remove",
style: .Default,
handler: { (action:UIAlertAction) -> Void in
self.fetchedIngredient.removeAtIndex(indexPath.row)
do{
let fetchedResults = try self.moc.executeFetchRequest(self.ingredientFetch)
if let result = fetchedResults[indexPath.row] as? NSManagedObject {
self.moc.deleteObject(result)
try self.moc.save()
}
}catch{
fatalError()
}
})
let cancelAction = UIAlertAction(title: "Cancel",
style: .Default) { (action: UIAlertAction) -> Void in
}
alert.addAction(cancelAction)
alert.addAction(deleteAction)
presentViewController(alert,
animated: true,
completion: nil)
TableView.reloadData()
}
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 prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
Since your problem isn't Core Data you need to use Table View beginUpdates and EndUpdates to insert the row. At the end of your buttonPressed function put this:
do{
fetchedIngredient = try moc.executeFetchRequest(ingredientFetch) as! [Cabinet]
self.tableView.beginUpdates()
let totalIngredients = fetchedIngredient.count
let newItemIndexPath = NSIndexPath(forRow: totalIngredients-1, inSection: 0)
self.tableView.insertRowsAtIndexPaths([newItemIndexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
self.tableView.endUpdates()
} catch {
fatalError()
}
On your number of rows in section:
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return fetchedIngredient.count
}
And on the cell for row at index path
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath)
cell.textLabel?.text = fetchedIngredient[indexPath.row].ingredient
return cell
}
There are a couple of problems with your code. Firstly, since you're fetching records into an array, calling reloadData will not have any impact unless you update the array. There is no automatic connection between adding a new core data record and your fetchedIngredient array.
There are a few ways to solve this, although the most common is probably to just refetch the records into the same array whenever core data is updated. Alternatively you can change your code to us NSFetchedResultsController instead of an array, which will automatically update the tableView when core data is updated (based on the predicate you provide it). This class provides the automatic connection to core data for you.
Another problem is that you are refetching the records in cellForRowAtIndexPath and didSelectRowAtIndexPath. This should not be done. Instead you should just be referring to the class-level fetchedIngredient array (or the NSFetchedResultsController if you choose to use that).
Furthermore, the call to dataTaskWithRequest runs in the background. It's not clear from the code how you're using it, but the fact that you have reloadData afterwards suggests it should impact the tableView. However because the task runs in the background, the completion handler will run after the table is reloaded. Therefore you should be calling reloadData inside the completion handler. And since it would then be running on another thread, you would have to dispatch it to the main queue, using:
dispatch_async(dispatch_get_main_queue()) {
self.tableView.reloadData()
}
Related
I am getting a Unexpectedly found nil while implicitly unwrapping an Optional value in my Code error when I try to use another view controller to save a new task in a to do list. When I tap a button I open up the entry page which then has a text field where I can enter the text to then create a task item. Here is the code for the main view controller:
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
let context = (UIApplication.shared.delegate as! AppDelegate).persistentContainer.viewContext
#IBOutlet var tableView: UITableView!
private var tasks = [TaskItem]()
override func viewDidLoad() {
super.viewDidLoad()
getAllTasks()
tableView.delegate = self
tableView.dataSource = self
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tasks.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = tasks[indexPath.row].title
return cell
}
#IBAction func didTapNewTask(){
let viewContoller = storyboard?.instantiateViewController(identifier: "entry") as! EntryViewController
viewContoller.title = "New Task"
viewContoller.update = {
DispatchQueue.main.async {
self.getAllTasks()
}
}
navigationController?.pushViewController(viewContoller, animated: true)
}
//Core Data Functions
//Used to get all our tasks in our Core Data
func getAllTasks() {
do {
tasks = try context.fetch(TaskItem.fetchRequest())
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
catch {
print("error getting all tasks \(error)")
}
}
//This is used to create a task, setting the properties to those in the parameters and then saving to our Core Data.
func createTask(title: String, notes: String, difficulty: Int32) {
let task = TaskItem(context: context)
task.title = title
task.notes = notes
task.difficulty = difficulty
task.dateCreated = Date()
do {
try context.save()
getAllTasks()
}
catch {
}
}
Here is the code for the entry view controller:
class EntryViewController: UIViewController, UITextFieldDelegate {
#IBOutlet var field: UITextField!
var update: (() -> Void)?
override func viewDidLoad() {
super.viewDidLoad()
field.delegate = self
// Do any additional setup after loading the view.
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
saveTask()
return true
}
#IBAction func saveTask(){
let vc = storyboard?.instantiateViewController(identifier: "tasks") as! ViewController
guard let text = field.text, !text.isEmpty else {
let alert = UIAlertController(title: "Error", message: "Please input a title" , preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "Confirm", style: UIAlertAction.Style.default, handler: nil))
self.present(alert,animated: true,completion: nil)
return
}
vc.createTask(title: text, notes: "Hello", difficulty: 10)
update?()
navigationController?.popViewController(animated: true)
}
The app crashes once I click save the new task but then once I reload the app the task I just created is there.
#IBAction func saveTask(){
let vc = storyboard?.instantiateViewController(identifier: "tasks") as! ViewController
guard let text = field.text, !text.isEmpty else {
let alert = UIAlertController(title: "Error", message: "Please input a title" , preferredStyle: UIAlertController.Style.alert)
alert.addAction(UIAlertAction(title: "Confirm", style: UIAlertAction.Style.default, handler: nil))
self.present(alert,animated: true,completion: nil)
return
}
vc.createTask(title: text, notes: "Hello", difficulty: 10)
update?()
navigationController?.popViewController(animated: true)
}
The first line of this method is the source of your problem. What you're doing here is making a new instance of the original view controller, not the instance you first came from.
This sort of works for a moment, because you then call createTask on that view controller to make your new task. That's fine, but that method then calls getAllTasks, which then dispatches to the main queue, which then calls reload data on your table.
But your table doesn't exist, because this is a new instance of the view controller which has never had it's view loaded. The table view is an implicitly unwrapped optional, but it's nil when you hit it here.
Your best solution is to pass in a block (like you have with update) to create a new task, and in that block call methods on the original view controller.
I am a beginner trying to learn the basic concepts of iOS and swift. So, I am making a demo app wherein I store names of people using UITableView. For making the app storage persistent I used core data with only one entity named 'Person' with a single attribute as 'name' which is a string value. To level up this application I need to add delete functionality. As we see in lot of iOS apps, the delete feature on swiping left, I want to implement the same functionality in this app. I have looked up on various solutions but I can't really get a hold of how I'll be able to delete a row and update the table in core data at the same time. I have been stuck at this problem since hours trying to delete a row in UITableView using swipe gesture. Any help would be appreciated.
Below is my code:
ViewController.swift
import UIKit
import CoreData
class ViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
var people: [NSManagedObject] = []
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
title = "The List"
tableView.register(UITableViewCell.self,
forCellReuseIdentifier: "Cell")
}
// Implement the addName IBAction
#IBAction func addName(_ sender: UIBarButtonItem) {
let alert = UIAlertController(title: "New Name", message: "Add a new name", preferredStyle: .alert)
let saveAction = UIAlertAction (title: "Save", style: .default) {
[unowned self] action in
guard let textField = alert.textFields?.first, let nameToSave = textField.text else {
return
}
self.save(name: nameToSave)
self.tableView.reloadData()
}
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel)
alert.addTextField()
alert.addAction(saveAction)
alert.addAction(cancelAction)
present(alert, animated: true)
}
// MARK: - SAVING TO CORE DATA
// CoreData kicks in here!
func save(name: String) {
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
// 1
let managedContext = appDelegate.persistentContainer.viewContext
// 2
let entity = NSEntityDescription.entity(forEntityName: "Person", in: managedContext)!
let person = NSManagedObject(entity: entity, insertInto: managedContext)
// 3
person.setValue(name, forKeyPath: "name")
// 4
do {
try managedContext.save()
people.append(person)
} catch let error as NSError {
print("Could not save. \(error), \(error.userInfo)")
}
}
// MARK: - FETCHING FROM CORE DATA
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// 1
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
// 2
let fetchRequest = NSFetchRequest<NSManagedObject>(entityName: "Person")
// 3
do {
people = try
managedContext.fetch(fetchRequest)
} catch let error as NSError {
print("Could not save. \(error), \(error.userInfo)")
}
}
}
// MARK: - UITableViewDataSource
extension ViewController: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return people.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let person = people[indexPath.row]
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath)
cell.textLabel?.text = person.value(forKeyPath: "name") as? String
return cell
}
}
// MARK: - UITableViewDelegate
extension ViewController: UITableViewDelegate {
func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
return true
}
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if (editingStyle == .delete) {
// handle delete (by removing the data from your array and updating the tableview)
}
}
}
App Screen:
Data model:
You have to delete the managed object by calling delete(_:) on the managed object context, e.g.:
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let person = people[indexPath.row]
managedContext.delete(person)
And to commit the change, call save() on the managed object context:
try? managedContext.save()
Then, don't forget to also update the person cache in your view controller:
people.remove(at: indexPath.row)
And finally, delete the row in your table view:
tableView.deleteRows(at: [indexPath], with: .automatic)
This should accomplish what you want.
The missing implementation could therefor be:
func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// delete the person in core data
guard let appDelegate = UIApplication.shared.delegate as? AppDelegate else {
return
}
let managedContext = appDelegate.persistentContainer.viewContext
let person = people[indexPath.row]
managedContext.delete(person)
try? managedContext.save()
// remove the person from cache
people.remove(at: indexPath.row)
// delete row from table view
tableView.deleteRows(at: [indexPath], with: .automatic)
}
}
I am trying to pull an array of strings in the from "my_classes" in the "User" class in Parse. I want each individual string within the array to become a separate cell in a tableview when I tap on the search button. This is my array in "my_classes" : ["Physics","Economics","Pre Calculus"]. I want "Physics" as it's own cell, "Economics" as its own cell, etc.
import UIKit
import Parse
class CardSetClassTableViewController: UITableViewController, UISearchBarDelegate {
// MARK: Outlets
#IBOutlet var searchBar: UISearchBar!
#IBOutlet var resultsTableView: UITableView!
// MARK: Variables
var searchResults = [String]()
// MARK: Actions
#IBAction func newClassBarButtonItemPressed(sender: AnyObject) {
self.performSegueWithIdentifier("newClassSegue", sender: self)
}
// MARK: Functions
override func viewDidLoad() {
super.viewDidLoad()
self.searchBar.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func displayAlert(title: String, message: String) {
let alert = UIAlertController(title: title, message: message, preferredStyle:UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
func searchBarSearchButtonClicked(searchBar: UISearchBar)
{
if reachabilityStatus == kNOTREACHABLE {
self.displayAlert("No Internet Connection", message: "Please connect to the internet before continuing.")
} else {
searchBar.resignFirstResponder()
print("Search word = \(searchBar.text!)")
let classNameQuery = PFQuery(className:"_User")
classNameQuery.whereKey("my_classes".lowercaseString, equalTo: searchBar.text!.lowercaseString)
let query = PFQuery.orQueryWithSubqueries([classNameQuery])
query.findObjectsInBackgroundWithBlock {
(results: [PFObject]?, error: NSError?) -> Void in
if error != nil {
self.displayAlert("Error", message: error!.localizedDescription)
return
}
if let objects = results {
self.searchResults.removeAll(keepCapacity: false)
for object in objects {
let className = object.valueForKey("my_classes") as! String
self.searchResults.append(className)
}
dispatch_async(dispatch_get_main_queue()) {
self.resultsTableView.reloadData()
self.searchBar.resignFirstResponder()
}
}
}
}
}
// MARK: - Table view data source
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return searchResults.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath)
cell.textLabel!.text = searchResults[indexPath.row]
return cell
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{
let classIndexPath = tableView.indexPathForSelectedRow!
let selectedCell = tableView.cellForRowAtIndexPath(classIndexPath)! as UITableViewCell
let spinningActivity = MBProgressHUD.showHUDAddedTo(self.view, animated: true)
spinningActivity.labelText = "Loading"
if reachabilityStatus == kNOTREACHABLE {
spinningActivity.hide(true)
self.displayAlert("No Internet Connection", message: "Please connect to the internet before continuing.")
} else {
// let className : String = String(selectedCell.textLabel!.text!)
self.performSegueWithIdentifier("addCardSet", sender: self)
}
searchBar.resignFirstResponder()
}
}
Thanks!
Try the following...
Edit
var songsArray = [String]()
func fetchUsers() {
let userQuery: PFQuery = PFUser.query()!
//search users by the sepcified username, returns a users! object
//make an array to put the values from the users! array object into
//then append those from your "middle-man" array into your destination array,
//in this example songArray is destination array and songsFromParse is "middle-man" array
userQuery.whereKey("username", equalTo: (username)!)
userQuery.findObjectsInBackgroundWithBlock({
(users, error) -> Void in
var songsFromParse = users!
if error == nil {
if songsFromParse.count != 0 {
self.songsArray = (songsFromParse[i].valueForKey("CurrentSongURLArray") as! Array)
}
self.tableView.reloadData()
} else {
print(error)
}
})
}
You then take your new array that contains the objects that you retrieved, in this example songsArray and use it to populate your tableView. In cellForRowAtIndexPath ...
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell ID")
cell?.textLabel?.text = songsArray[indexPath]
return cell!
}
I am working on an application that retrieves a user's friends from a database and outputs then in a table view.
I have successfully coded the table view to the point where it reads the indexes I insert into an NSMutableArray(). My thinking is to use NSURL to send a query to a MySQL database via URL variables with PHP.
I have used NSURL many times to interact with the database, however when I use it in the viewDidLoad() function to load the friends immediately on the application's load, it crashes but does not return an error.
Code:
class viewFriendsViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
var textArray: NSMutableArray = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
let myUrl = NSURL(string: "http://www.casacorazon.org/ios.html")
let request = NSMutableURLRequest(URL: myUrl!)
request.HTTPMethod = "POST"
let task = NSURLSession.sharedSession().dataTaskWithRequest(request) {
data, response, error in
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {
let responseString = NSString(data: data!, encoding: NSUTF8StringEncoding)
if error != nil {
print("Error: \(error)")
}
dispatch_async(dispatch_get_main_queue()) {
print(responseString)
}
}
}
task.resume()
//get username from NSUserDefaults
//if username inavailable, insert error report into first row
//use PHP script to get friends from user's database
//split return string by '9245203598' into array
//load split array into NSMutableArray via foreach loop
//let username = NSUserDefaults.standardUserDefaults().stringForKey("username")*/
self.textArray.addObject("First Index")
self.textArray.addObject("Second Index")
self.textArray.addObject("Third Index")
self.tableView.rowHeight = UITableViewAutomaticDimension
self.tableView.estimatedRowHeight = 44.0
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.textArray.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell: UITableViewCell = self.tableView.dequeueReusableCellWithIdentifier("cell")! as UITableViewCell
cell.textLabel?.text = self.textArray.objectAtIndex(indexPath.row) as? String
return cell
}
func sendAlert(subject: String, message: String) {
let alertController = UIAlertController(title: subject, message:
message, preferredStyle: UIAlertControllerStyle.Alert)
alertController.addAction(UIAlertAction(title: "Dismiss", style: UIAlertActionStyle.Default,handler: nil))
self.presentViewController(alertController, animated: true, completion: nil)
}
}
because your app complete excuting the code in UI before the background finish its task. you have to ensure that background task is completed then continue in UI.
Note: NSUrlsesstion is running in background you don't have to import dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {} inside it.
import UIKit
class FavouritesTableViewController: UITableViewController {
let factBook = FactBook()
var userQuoteData: NSMutableArray = NSMutableArray()
let colorWheel = ColorWheel()
override func viewDidAppear(animated: Bool) {
var refreshControl = UIRefreshControl()
refreshControl.addTarget(self, action: Selector("loadData"), forControlEvents: UIControlEvents.ValueChanged)
self.refreshControl = refreshControl
self.loadData()
//********** For resizbale cells UILABEL **************//
// tableView.estimatedRowHeight = 102 // Replace with your actual estimation
// // Automatic dimensions to tell the table view to use dynamic height
// tableView.rowHeight = UITableViewAutomaticDimension
//********** For resizbale cells UILABEL **************//
// if (PFUser.currentUser() == nil) {
// var loginAlert:UIAlertController = UIAlertController(title: "Sign Up / Login", message: "Please sign up or login", preferredStyle: UIAlertControllerStyle.Alert)
//
// loginAlert.addTextFieldWithConfigurationHandler({
// textfield in
// textfield.placeholder = "Your username"
// })
//
// loginAlert.addTextFieldWithConfigurationHandler({
// textfield in
// textfield.secureTextEntry = true
// textfield.placeholder = "Your password"
// })
//
// loginAlert.addAction(UIAlertAction(title: "Login", style: UIAlertActionStyle.Default, handler: {
// alertAction in
// let textField:NSArray = loginAlert.textFields as NSArray!
// let usernameTextField:UITextField = textField.objectAtIndex(0) as UITextField
// let passwoordTextField:UITextField = textField.objectAtIndex(1) as UITextField
//
// PFUser.logInWithUsernameInBackground(usernameTextField.text, password: passwoordTextField.text, block: { (user:PFUser!, error:NSError!) -> Void in
// if ((user) != nil) {
// println("Login Successful")
// }else {
// println("Login Failed")
// }
// })
// }))
//
// loginAlert.addAction(UIAlertAction(title: "Signup", style: UIAlertActionStyle.Default, handler: {
// alertAction in
// let textField:NSArray = loginAlert.textFields as NSArray!
// let usernameTextField:UITextField = textField.objectAtIndex(0) as UITextField
// let passwoordTextField:UITextField = textField.objectAtIndex(1) as UITextField
//
// var user:PFUser = PFUser()
// user.username = usernameTextField.text
// user.password = passwoordTextField.text
//
// user.signUpInBackgroundWithBlock({ (sucsess: Bool!, error:NSError!) -> Void in
// if error == nil {
// println("Sign Up sucessful")
// } else {
// let error = error.userInfo
// println(error)
// }
// })
//
// }))
//
// self.presentViewController(loginAlert, animated: true, completion: nil)
//
// }
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: Segue to Main View Controller
#IBAction func CancelButton(sender: AnyObject) {
self.dismissViewControllerAnimated(true, completion: nil)
}
//MARK: logout the user
#IBAction func logoutUser(sender: AnyObject) {
let alertController = UIAlertController(title: "Logout", message: "Are you sure you want to logout?", preferredStyle: .Alert)
let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (action) in
// ...
}
alertController.addAction(cancelAction)
let OKAction = UIAlertAction(title: "OK", style: .Default) { (action) in
PFUser.logOut()
self.performSegueWithIdentifier("selectedQuoteSegue", sender: nil)
var currentUser = PFUser.currentUser() // this will now be nil
println(currentUser)
}
alertController.addAction(OKAction)
self.presentViewController(alertController, animated: true) {
// ...
}
}
// MARK: Getting Quotes from Parse.com for a particular user
func loadData() {
userQuoteData.removeAllObjects()
var findUserQuoteData: PFQuery = PFQuery(className: "favouriteQuotes")
findUserQuoteData.whereKey("user", equalTo: PFUser.currentUser())
findUserQuoteData.findObjectsInBackgroundWithBlock{ (objects:[AnyObject]!, error:NSError!) -> Void in
if error == nil{
for object in objects{
let user: PFObject = object as PFObject
self.userQuoteData.addObject(user)
}
let array:NSArray = self.userQuoteData.reverseObjectEnumerator().allObjects
self.userQuoteData = NSMutableArray(array: array)
self.tableView.reloadData()
self.refreshControl?.endRefreshing()
}
}
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return userQuoteData.count
}
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?) -> UITableViewCell {
let cell:FavouritesTableViewCell = tableView!.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath!) as FavouritesTableViewCell
let favouriteQuotes:PFObject = self.userQuoteData.objectAtIndex(indexPath!.row) as PFObject
cell.favouriteQuoteTextView.text = favouriteQuotes.objectForKey("content") as? String
cell.favouriteQuoteTextView.backgroundColor = colorWheel.randomColor()
//Label Animation
cell.favouriteQuoteTextView.alpha = 0
//Date Formatter
// var dateFormatter:NSDateFormatter = NSDateFormatter()
// dateFormatter.dateFormat = "yyyy-MM-dd HH:mm"
// cell.timestampLabel.text = dateFormatter.stringFromDate(sweet.createdAt)
//Find User
// var findSweeter:PFQuery = PFUser.query()
// findSweeter.whereKey("objectId", equalTo: sweet.objectForKey("sweeter").objectId)
//
// findSweeter.findObjectsInBackgroundWithBlock { (objects:[AnyObject]!, error:NSError!) -> Void in
// if error == nil {
// let user:PFUser = (objects as NSArray).lastObject as PFUser
// cell.usernameLabel.text = user.username
//Animation automation
UIView.animateWithDuration(0.5, animations: { () -> Void in
cell.favouriteQuoteTextView.alpha = 1
})
// }
//
// }
cell.favouriteQuoteTextView.scrollRangeToVisible(NSMakeRange(0, 0))
return cell
}
override func tableView(tableView: UITableView?, didSelectRowAtIndexPath indexPath: NSIndexPath?) {
let cell:FavouritesTableViewCell = tableView!.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath!) as FavouritesTableViewCell
var selectedQuoteFromFavourites: AnyObject = self.userQuoteData.objectAtIndex(indexPath!.row)
var selectedQuote: String = selectedQuoteFromFavourites.objectForKey("content") as String!
println(selectedQuote)
NSUserDefaults.standardUserDefaults().setObject(selectedQuote, forKey: "currentQuote") // we are saving a variable called myName and we are giving it the value of "Bob"
NSUserDefaults.standardUserDefaults().synchronize() // Added synchronize as suggested by LAMMERT WESTERHOFF
println(NSUserDefaults.standardUserDefaults().objectForKey("currentQuote")!) // Here we are accessing the variable.
// factBook.currentQuoteIndexArray()
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "segueHappened") // we are saving a variable called myName and we are giving it the value of "Bob"
NSUserDefaults.standardUserDefaults().synchronize() // Added synchronize as suggested by LAMMERT WESTERHOFF
// println(NSUserDefaults.standardUserDefaults().boolForKey("segueHappened")) // Here we are accessing the variable.
self.performSegueWithIdentifier("selectedQuoteSegue", sender: AnyObject?())
}
//MARK: Swipe to delete
override func tableView(tableView: UITableView, canEditRowAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
//MARK: Deleting Object PFQuery
override func tableView(tableView: UITableView?, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath?) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
println("touch")
// var selectedQuoteFromFavourites: AnyObject = self.userQuoteData.objectAtIndex(indexPath!.row)
//
// var selectedQuote: String = selectedQuoteFromFavourites.objectForKey("content") as String!
//
// println(selectedQuote)
//Query objectId from parse and delete!
// self.tableView.reloadData()
}
}
I have this loadData() function that gets all the Quotes that a user has stored to my Parse backend. I think it puts the data received from parse into this NSMutable array "userQuoteData". This is what my tableview uses to populate the cells. I added a swipe to delete function at the bottom of this code. it looks like this:
override func tableView(tableView: UITableView?, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath?) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
within this swipe to delete function:
How do I tell parse to delete the corrent row with the content of the current cell that is selected(swiped). so I can then reloadData on that tableview with my amended list of quotes from parse. Do I need to find the objectId? Really lost. Thanks in advance.
You've set self.userQuoteData to contain the full PFObjects so simply delete the object; and you'll need to remove the selected object from the self.userQuoteData array before reloading since it informs your table data.
Also, your Parse table doesn't inform your cellForRowAtIndexPath: directly at all -- the self.userQuoteData array does -- so the Parse table doesn't technically need to be updated in order for your table to reflect the changes. So like I've done in the code below, you can delete your object from Parse in the background even as your table reloads.
override func tableView(tableView: UITableView?, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath?) {
if (editingStyle == UITableViewCellEditingStyle.Delete) {
var selectedQuoteFromFavourites:PFObject = self.userQuoteData.objectAtIndex(indexPath!.row) as PFObject
selectedQuoteFromFavourites.deleteInBackground()
self.userQuoteData.removeObjectAtIndex(indexPath!.row)
self.tableView.reloadData()
}
}