This code is responsible for uploading the text and and the time of the post under an auto generated key of the logged in user it is in the function didtappost in the first line
#IBOutlet weak var post: UIButton!
#IBOutlet weak var newpost: UITextView!
var databaseref = FIRDatabase.database().reference()
var loggedinuser : AnyObject?
override func viewDidLoad()
{
super.viewDidLoad()
self.loggedinuser = FIRAuth.auth()?.currentUser
newpost.textContainerInset = UIEdgeInsetsMake(30, 20, 20, 20)
newpost.text = "what is new?"
newpost.textColor = UIColor.lightGray
}
#IBAction func didtapcancel(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
func textFieldShouldReturn(_ textfield: UITextField) -> Bool {
textfield.resignFirstResponder()
return false
}
#IBAction func didtappost(_ sender: Any) {
if(newpost.text.characters.count>0)
{
let key = databaseref.child("posts").childByAutoId().key
let childupdates = ["/posts/\(self.loggedinuser!.uid)/\(key)/text ": newpost.text,"/posts/\(self.loggedinuser!.uid)/\(key)/time":"\(Date().timeIntervalSince1970)"
] as [String : Any]
self.databaseref.updateChildValues(childupdates)
dismiss(animated: true, completion: nil)
}
}
}
Related
First post so apologies for anything I do wrong here.
I've been stuck on this for awhile now. I think the problem is pretty straight forward, but I seem to be missing something. The code below is from my homeVC which has a tableview. I created a tableViewCell as well. I have firebase hooked up and the data saves properly. Overall goal is to create a recipe manager. Home screen has a list of recipes, you can add and edit. When you click on the recipe name in the homeVC table you are taken to ShowDataVC. I am able to load the recipe name into the tableview but cant seem to get it to load when selected to the ShowDataVC. Ultimately I think I want to be able to use the UUID I created for each recipe to display all info, handling edits, handling error state if no recipe is found for that ID.
Thanks in advance!
struct RecipeData {
let user: String
let recipeName: String
let ingredientsText: String?
let directionsText: String?
let servingsNumber: Int?
let id = UUID().uuidString
}
import UIKit
import Firebase
class HomeViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var table: UITableView!
#IBOutlet weak var logout: UIBarButtonItem!
#IBOutlet weak var add: UIBarButtonItem!
let db = Firestore.firestore()
var id = UUID().uuidString
var data = [RecipeData]()
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .gray
table.delegate = self
table.dataSource = self
navigationItem.hidesBackButton = true
table.register(UINib(nibName: D.cellNibName, bundle: nil), forCellReuseIdentifier: D.cellIdentifier)
loadRecipeNames()
}
func loadRecipeNames() {
db.collection(D.FStore.collectionName)
.addSnapshotListener { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
for document in querySnapshot!.documents {
let data = document.data()
if let user = data[D.FStore.userField] as? String,
let recipeNameLabels = data[D.FStore.recipeTextField] as? String {
//print("This is = \(document.documentID) => \(document.data())")
let newRecipe = RecipeData(user: user, recipeName: recipeNameLabels, ingredientsText: nil, directionsText: nil, servingsNumber: nil)
self.data.append(newRecipe)
DispatchQueue.main.async {
self.table.reloadData()
let indexPath = IndexPath(row: self.data.count - 1, section: 0)
self.table.scrollToRow(at: indexPath, at: .top, animated: true)
}
}
}
}
}
}
#IBAction func logoutPressed(_ sender: UIBarButtonItem) {
do {
try Auth.auth().signOut()
navigationController?.popToRootViewController(animated: true)
} catch let signOutError as NSError {
print("Error signing out: %#", signOutError)
}
}
#IBAction func addPressed(_ sender: UIBarButtonItem) {
let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: D.addRecipeSegue) as! AddRecipeViewController
navigationController?.pushViewController(vc, animated: true)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return data.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let data = data[indexPath.row]
let cell = table.dequeueReusableCell(withIdentifier: D.cellIdentifier, for: indexPath) as! RecipeNameCell
cell.label.text = data.recipeName
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "ShowSegue", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "ShowSegue" {
if let indexPath = table.indexPathForSelectedRow {
let vc = segue.destination as! ShowRecipeDataViewController
vc.newData = data[indexPath.row]
}
}
}
}
import UIKit
import Firebase
class AddRecipeViewController: UIViewController, UIImagePickerControllerDelegate & UINavigationControllerDelegate {
#IBOutlet weak var recipeNameTextField: UITextField!
#IBOutlet weak var ingredientsTextField: UITextView!
#IBOutlet weak var directionsTextField: UITextView!
#IBOutlet weak var stepper: UIStepper!
#IBOutlet weak var numServingLabel: UILabel!
#IBOutlet weak var imageView: UIImageView!
#IBOutlet weak var takePicture: UIButton!
#IBOutlet weak var saveButton: UIBarButtonItem!
let db = Firestore.firestore()
var data: [RecipeData] = []
var stepperValue: Int = 0
var id = UUID().uuidString
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .lightGray
}
#IBAction func savePressed(_ sender: UIBarButtonItem) {
if let text = recipeNameTextField.text, !text.isEmpty {
saveData(text: text)
print("Data successfully saved!")
}
}
func saveData(text: String) {
if let recipeName = recipeNameTextField.text,
let addedIngredients = ingredientsTextField.text,
let directionsText = directionsTextField.text,
let servingsNum = numServingLabel.text,
let user = Auth.auth().currentUser?.email {
let newRecipeRef = db.collection(D.FStore.collectionName).document(id)
newRecipeRef.setData([
D.FStore.recipeTextField: recipeName,
D.FStore.ingredientsText: addedIngredients,
D.FStore.directionsText: directionsText,
D.FStore.numberServings: servingsNum,
D.FStore.userField: user,
D.FStore.id: id
]) { err in
if let err = err {
print("Error adding document: \(err)")
} else {
print("Document added with ID:\(newRecipeRef)")
}
}
}
}
#IBAction func takePicturePressed(_ sender: UIButton) {
let picker = UIImagePickerController()
picker.sourceType = .camera
picker.delegate = self
picker.allowsEditing = true
present(picker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
picker.dismiss(animated: true, completion: nil)
guard let image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage else {
return
}
guard let imageData = image.pngData() else {
return
}
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true, completion: nil)
}
#IBAction func stepperPressed(_ sender: UIStepper) {
stepperValue = Int(sender.value)
numServingLabel.text = "\(stepperValue)"
}
}
import UIKit
import Firebase
class ShowRecipeDataViewController: UIViewController {
#IBOutlet weak var recipeNameLabel: UILabel!
#IBOutlet weak var ingredientsText: UILabel!
#IBOutlet weak var directionsText: UILabel!
#IBOutlet weak var numServings: UILabel!
#IBOutlet weak var logout: UIBarButtonItem!
let db = Firestore.firestore()
var newData = [RecipeData]()
var data: [RecipeData] = []
var id = UUID().uuidString
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemOrange
}
#IBAction func logoutPressed() {
do {
try Auth.auth().signOut()
navigationController?.popToRootViewController(animated: true)
} catch let signOutError as NSError {
print("Error signing out: %#", signOutError)
}
}
}
Update
You'll need to assign the values to your outlets. You can do that like so.
class ShowRecipeDataViewController: UIViewController {
#IBOutlet weak var recipeNameLabel: UILabel!
#IBOutlet weak var ingredientsText: UILabel!
#IBOutlet weak var directionsText: UILabel!
#IBOutlet weak var numServings: UILabel!
#IBOutlet weak var logout: UIBarButtonItem!
let db = Firestore.firestore()
var newData: RecipeData? = nil
var data: [RecipeData] = []
var id = UUID().uuidString
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = .systemOrange
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
guard let newData = newData else {
return
}
recipeNameLabel.text = newData.recipeName
ingredientsText.text = newData.ingredientsText
directionsText.text = newData.directionsText
numServings.text = "\(newData.servingsNumber)"
}
#IBAction func logoutPressed() {
do {
try Auth.auth().signOut()
navigationController?.popToRootViewController(animated: true)
} catch let signOutError as NSError {
print("Error signing out: %#", signOutError)
}
}
}
Original Answer
You'll need to share your ShowRecipeDataViewController code to get a better answer. But, the problem is probably there. But if I had to guess you'll need to add the code to tell the textField or Label to have the data in it.
Often, people do that in the ViewDidLoad function like:
// inside ShowRecipeDataViewController
override func viewDidLoad() {
super.viewDidLoad()
recipeLabel.text = data.recipeName
ingredientsTextField.text = data.ingredients
}
// etc.,
I am following a tutorial and cannot seem to register my user as the user variable in the Firebase .createUser method appears to be nil. Therefore, when I unwrap it, I get an error.
I have read through a lot of the documentation as well as checked many other questions similar to mine but nothing seems to work
import UIKit
import Firebase
import SwiftKeychainWrapper
class ViewController: UIViewController {
#IBOutlet weak var userImgView: UIImageView!
#IBOutlet weak var usernameField: UITextField!
#IBOutlet weak var emailField: UITextField!
#IBOutlet weak var passwordField: UITextField!
var imagePicker: UIImagePickerController!
var selectedImage: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
imagePicker = UIImagePickerController()
imagePicker.allowsEditing = true
imagePicker.delegate = self
}
override func viewDidAppear(_ animated: Bool) {
if let _ = KeychainWrapper.standard.string(forKey: "uid") {
self.performSegue(withIdentifier: "toFeed", sender: nil)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func setupUser(userUid: String) {
if let imageData = self.userImgView.image!.jpegData(compressionQuality: 0.2) {
let imgUid = NSUUID().uuidString
let metaData = StorageMetadata()
Storage.storage().reference().child(imgUid).putData(imageData, metadata: metaData) { (metadata, error) in
let downloadURL = metadata
let userData = [
"username": self.usernameField.text!,
"userImg": downloadURL!
] as [String : Any]
Database.database().reference().child("users").child(userUid).setValue(userData)
self.performSegue(withIdentifier: "toFeed", sender: nil)
}
}
}
#IBAction func signInPressed(_ sender: Any) {
if let email = emailField.text, let password = passwordField.text {
Auth.auth().signIn(withEmail: email, password: password) { user, error in
if error != nil && !(self.usernameField.text?.isEmpty)! {
Auth.auth().createUser(withEmail: email, password: password) { (user, error) in
self.performSegue(withIdentifier: "toFeed", sender: nil)
let userID = (user?.user.uid)!
self.setupUser(userUid: userID)
KeychainWrapper.standard.set(userID, forKey: "uid")
}
} else {
if let userID = (user?.user.uid) {
KeychainWrapper.standard.set((userID), forKey: "uid")
self.performSegue(withIdentifier: "toFeed", sender: nil)
}
}
}
}
}
#IBAction func getPhoto (_ sender: AnyObject) {
present(imagePicker, animated: true, completion: nil)
}
}
extension ViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
internal func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
if let image = info[.originalImage] as? UIImage {
userImgView.image = image
} else {
print("image wasnt selected")
}
imagePicker.dismiss(animated: true, completion: nil)
}
}
The error I am getting is one the "let userID = (user?.user.uid)!". It is
Thread 1: EXC_BAD_INSTRUCTION (code=EXC_I386_INVOP, subcode=0x0)
The completion block for createUser(withEmail:,password:) gets called with either a AuthResult.user or an error. That why, as Joshua commented, you should check if error is nil before accessing any of the user properties.
From the auth quickstart for Swift:
Auth.auth().createUser(withEmail: email, password: password) { authResult, error in
strongSelf.hideSpinner {
guard let user = authResult?.user, error == nil else {
strongSelf.showMessagePrompt(error!.localizedDescription)
return
}
print("\(user.email!) created")
strongSelf.navigationController?.popViewController(animated: true)
}
}
I am currently working on an app and I am stuck on the following: I have my mainVC (ReceiveInputVC), which after I enter an input, it goes to the secondVC (TimeLeftVC) and it updates all of its labels with results from the inputs received from the mainVC. My question is: How can I, after clicking on the arrow to go back to the mainVC or even if I close the app, when I click on the arrow from the mainVC to go to the secondVC have my labels showing the same values as before the user closed the application or returned to the main screen?
import UIKit
extension UIViewController {
func hideKeyboard() {
let tap: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(dismissKeyboard))
view.addGestureRecognizer(tap)
}
#objc func dismissKeyboard() {
view.endEditing(true)
}
}
class ReceiveInputVC: UIViewController {
#IBOutlet weak var hourglassButton: UIButton!
#IBOutlet weak var whatIsYourAgeField: UITextField!
#IBOutlet weak var ageToDieField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.hideKeyboard()
}
#IBAction func arrowBtnPressed(_ sender: Any) {
// When pressed should show go to TimeLeftVC and show last result from the first time user entered the inputs, if nothing has been typed yet and no data has been saved an alert should pop up asking the user to enter an input on both fields
}
#IBAction func hourglassBtnPressed(_ sender: Any) {
let checkAgeField: Int? = Int(whatIsYourAgeField.text!)
let checkDyingAgeField: Int? = Int(ageToDieField.text!)
if (whatIsYourAgeField.text == "" || ageToDieField.text == "") || (whatIsYourAgeField.text == "" && ageToDieField.text == "") {
alert(message: "You must enter an input on both fields")
} else if checkAgeField! < 1 || checkDyingAgeField! > 100 {
alert(message: "You must enter an age higher than 1 and a dying age lower than 100")
} else if (checkAgeField! > checkDyingAgeField!) || (checkAgeField! == checkDyingAgeField!) {
alert(message: "You must enter an age lower than a dying age")
} else {
performSegue(withIdentifier: "goToSecondScreen", sender: self)
}
}
func alert(message: String, title: String = "Alert") {
let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "Try Again", style: UIAlertAction.Style.default, handler: nil))
self.present(alert, animated: true, completion: nil)
}
// Passing the data entered from ReceiveInputVC to TimeLeftVC
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "goToSecondScreen" {
let destinationTimeLeftVC = segue.destination as! TimeLeftVC
destinationTimeLeftVC.ageReceived = whatIsYourAgeField.text
destinationTimeLeftVC.ageToDieReceived = ageToDieField.text
}
}
}
import CircleProgressBar
class TimeLeftVC: UIViewController {
var ageReceived: String! // receive whatIsYourAgeField data from ReceiveInputVC
var ageToDieReceived: String! // receive ageToDieField data from ReceiveInputVC
#IBOutlet weak var yearsLeftLabel: UILabel!
#IBOutlet weak var daysLeftLabel: UILabel!
#IBOutlet weak var hoursLeftLabel: UILabel!
#IBOutlet weak var progressBar: CircleProgressBar!
override func viewDidLoad() {
super.viewDidLoad()
createResults()
}
func createResults() {
if let userAge = Int(ageReceived), let dyingAge = Int(ageToDieReceived) {
let yearsLeft = dyingAge - userAge
let daysLeft = yearsLeft * 365
let hoursLeft = daysLeft * 24
// Update UI
yearsLeftLabel.text = "\(yearsLeft)"
daysLeftLabel.text = "\(daysLeft)"
hoursLeftLabel.text = "\(hoursLeft)"
let percentage = (CGFloat(yearsLeft) / CGFloat(dyingAge)) * 100
let formatted = String(format: "%.1f", percentage)
// Update Circle Progress Bar
progressBar.setHintTextGenerationBlock { (progress) -> String? in
return String.init(format: "\(formatted)%%", arguments: [progress])
}
progressBar.setProgress(percentage/100, animated: true, duration: 4.0)
}
}
Project on GitHub: https://github.com/mvvieira95/Time-Life.git
You can use Coredata or another data base or user default
User default implementation:
#IBAction func arrowBtnPressed(_ sender: Any) {
UserDefaults.standard.set("your input values from text field or ...", forKey: "key")
}
In second view controller get it with
UserDefaults.standard.string(forKey: "key")
You can save and restore states with these methods
application:shouldSaveApplicationState and application:shouldRestoreApplicationStat.
Example:
func application(_ application: UIApplication,
shouldSaveApplicationState coder: NSCoder) -> Bool {
// Save the current app version to the archive.
coder.encode(11.0, forKey: "MyAppVersion")
// Always save state information.
return true
}
func application(_ application: UIApplication,
shouldRestoreApplicationState coder: NSCoder) -> Bool {
// Restore the state only if the app version matches.
let version = coder.decodeFloat(forKey: "MyAppVersion")
if version == 11.0 {
return true
}
// Do not restore from old data.
return false
}
You can explore the document in https://developer.apple.com/documentation/uikit/view_controllers/preserving_your_app_s_ui_across_launches?language=objc
Thanks guys, I came up with a solution:
class ReceiveInputVC: UIViewController {
#IBAction func arrowBtnPressed(_ sender: Any) {
let defaults = UserDefaults.standard
if let _ = defaults.object(forKey: "yearsSaved"), let _ = defaults.object(forKey: "daysSaved"), let _ = defaults.object(forKey: "hoursSaved") {
performSegue(withIdentifier: "goToSecondScreen", sender: self)
} else {
alert(message: "You must first enter an input")
}
}
class TimeLeftVC: UIViewController {
var ageReceived: String! // receive whatIsYourAgeField data from ReceiveInputVC
var ageToDieReceived: String! // receive ageToDieField data from ReceiveInputVC
#IBOutlet weak var yearsLeftLabel: UILabel!
#IBOutlet weak var daysLeftLabel: UILabel!
#IBOutlet weak var hoursLeftLabel: UILabel!
#IBOutlet weak var progressBar: CircleProgressBar!
override func viewDidLoad() {
super.viewDidLoad()
let defaults = UserDefaults.standard
yearsLeftLabel.text = defaults.object(forKey: "yearsSaved") as? String
daysLeftLabel.text = defaults.object(forKey: "daysSaved") as? String
hoursLeftLabel.text = defaults.object(forKey: "hoursSaved") as? String
}
override func viewWillAppear(_ animated: Bool) {
createResults()
}
func createResults() {
if let userAge = Int(ageReceived), let dyingAge = Int(ageToDieReceived) {
let yearsLeft = dyingAge - userAge
let daysLeft = yearsLeft * 365
let hoursLeft = daysLeft * 24
// Update UI
yearsLeftLabel.text = "\(yearsLeft)"
daysLeftLabel.text = "\(daysLeft)"
hoursLeftLabel.text = "\(hoursLeft)"
// Store Data
let defaults = UserDefaults.standard
defaults.set(yearsLeftLabel.text, forKey: "yearsSaved")
defaults.set(daysLeftLabel.text, forKey: "daysSaved")
defaults.set(hoursLeftLabel.text, forKey: "hoursSaved")
// Update Circle Progress Bar
let percentage = (CGFloat(yearsLeft) / CGFloat(dyingAge)) * 100
let formatted = String(format: "%.1f", percentage)
progressBar.setHintTextGenerationBlock { (progress) -> String? in
return String.init(format: "\(formatted)%%", arguments: [progress])
}
progressBar.setProgress(percentage/100, animated: true, duration: 4.0)
}
}
Having troubles now updating that progressBar when I go back to the view...
This question already has answers here:
Xcode 8 says "Do you want to add a stub?" How do I answer?
(3 answers)
Closed 4 years ago.
I added the ImageView Protocol. What can be done to remove the error
Do you want to add protocol stubs?
CardsViewController
import UIKit
protocol ImageViewProtocol{
func sendImageToViewController(theImage: UIImage)
}
class CardsViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate, ImageViewProtocol {
#IBOutlet weak var textField: UITextField!
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var locationTextField: UITextField!
#IBOutlet weak var imageView: UIImageView!
#IBAction func goToViewController2Action(_ sender: Any)
{
let viewcontroller2 = storyboard?.instantiateViewController(withIdentifier: "viewController2") as! ViewController2
viewcontroller2.delegate = self
self.navigationController?.pushViewController(viewcontroller2, animated: true)
}
func chooseImagePickerAction(source: UIImagePickerController.SourceType) {
if UIImagePickerController.isSourceTypeAvailable(source) {
let imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.allowsEditing = true
imagePicker.sourceType = source
self.present(imagePicker, animated: true, completion: nil)
}
}
#IBAction func saveButtonPressed(_ sender: UIBarButtonItem) {
if nameTextField.text == "" || locationTextField.text == "" || textField.text == "" {
print("Not all fields are filled")
} else {
if let context = (UIApplication.shared.delegate as? AppDelegate)?.coreDataStack.persistentContainer.viewContext {
let card = Card(context: context)
card.name = nameTextField.text
card.location = locationTextField.text
card.number = textField.text
if let image = imageView.image {
card.image = image.pngData()
}
do {
try context.save()
print("Cохранение удалось!")
} catch let error as NSError {
print("Не удалось сохранить данные \(error), \(error.userInfo)")
}
}
performSegue(withIdentifier: "unwindSegueFromNewCard", sender: self)
}
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
imageView.image = info[UIImagePickerController.InfoKey.editedImage] as? UIImage
imageView.contentMode = .scaleAspectFill
imageView.clipsToBounds = true
dismiss(animated: true, completion: nil)
}
}
ViewController2
import UIKit
class ViewController2: UIViewController {
var filter : CIFilter!
var delegate: ImageViewProtocol!
#IBOutlet weak var select: UISegmentedControl!
#IBOutlet weak var textField: UITextField!
#IBOutlet weak var barcodeImageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
barcodeImageView.image = UIImage(named: "photo")
}
#IBAction func saveButtonAction(_ sender: Any) {
if textField.text == "" {
print("Not all fields are filled")
} else {
delegate.sendImageToViewController(theImage: barcodeImageView.image!)
self.navigationController?.popViewController(animated: true)
}
performSegue(withIdentifier: "unwindSegueFromViewController", sender: sender)
}
#IBAction func tappedEnter(_ sender: Any) {
if textField.text?.isEmpty ?? true {
return
} else {
if let texttxt = textField.text {
let data = texttxt.data(using: .ascii, allowLossyConversion: false)
if select.selectedSegmentIndex == 0
{
filter = CIFilter(name: "CICode128BarcodeGenerator")
} else {
filter = CIFilter(name: "CIQRCodeGenerator")
}
filter.setValue(data, forKey: "inputMessage")
let transform = CGAffineTransform(scaleX: 5, y: 5)
let image = UIImage(ciImage: filter.outputImage!.transformed(by: transform))
barcodeImageView.image = image
}
}
}
}
This error comes because you implemented protocol (ImageViewProtcol) but you haven't add required methods of your protocol (in your case sendImageToViewController(theImage: UIImage)). All methods of your protocol are required by default. If you want to change it, you can look here.
It's the same as when you're implementing UITableViewDataSource, you also need to add required methods like number of items etc.
To fix this, add this method to your CardsViewController:
func sendImageToViewController(theImage: UIImage) {
// do something with image
}
I am trying to populate a UITableView with data passed to the ViewController from LoginViewController after the user logs in.
The current process is:
ViewController loads first, if user is not logged in LoginViewController pops up over the top. User logs in, details are fetched from the database (userDetails and communities). LoginViewController is then dismissed and ViewController is again visible.
The communities variable is being populated and values transferred from LoginViewController to ViewController.
I believe my problem is func tableView is run before the data is fetched from the user logging in.
print ("test 1: ",communities) just prints [],[],[],[]
However print ("test 2: ",communities) prints the correct values.
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UsernameSentDelegate {
#IBOutlet weak var scrollView: UIScrollView!
#IBOutlet weak var receiveUsername: UILabel!
#IBOutlet weak var userEmailText: UILabel!
var userEmail: String?
var communities = [String]()
#IBOutlet weak var communitiesTableView: UITableView!
#IBAction func unwindToHome(_ segue: UIStoryboardSegue) {
}
//recieves email address from delegate from LoginViewController
func userLoggedIn(data: String) {
userEmailText.text = data
}
override func viewDidLoad() {
super.viewDidLoad()
self.communitiesTableView.delegate = self
self.communitiesTableView.dataSource = self
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print ("test 1: ",communities) //not printing value
return self.communities.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let title = self.communities[indexPath.row]
let cell = UITableViewCell()
cell.textLabel?.text = title
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.identifier == "loginView" {
let loginViewController: LoginViewController = segue.destination as! LoginViewController
loginViewController.delegate = self
}
if segue.identifier == "createCommunitySegue" {
let createCommunityController: CreateNewCommunity = segue.destination as! CreateNewCommunity
createCommunityController.myEmail = userEmailText.text
}
}
override func viewDidAppear(_ animated: Bool)
{
print ("test 2: ",communities) //prints values correctly
let isUserLoggedIn = UserDefaults.bool(UserDefaults.standard)(forKey: "isUserLoggedIn");
if(!isUserLoggedIn)
{
self.performSegue(withIdentifier: "loginView", sender: self);
}
}
#IBAction func logoutButtonTapped(_ sender: AnyObject) {
UserDefaults.set(UserDefaults.standard)(false, forKey: "isUserLoggedIn");
self.performSegue(withIdentifier: "loginView", sender: self);
}
#IBAction func createCommunityTapped(_ sender: AnyObject) {
}
}
This is the code for CreateCommunityViewController:
import UIKit
class CreateNewCommunity: UIViewController {
#IBOutlet weak var communityNameTextField: UITextField!
#IBOutlet weak var passwordTextField: UILabel!
#IBOutlet weak var emailLabel: UILabel!
var myEmail: String?
#IBAction func cancelButtonPapped(_ sender: AnyObject) {
self.performSegue(withIdentifier: "unwindCommunity", sender: self)
}
#IBAction func createCommunityButtonTapped(_ sender: AnyObject) {
let communityName = communityNameTextField.text;
if (communityName!.isEmpty){
displayMyAlertMessage(userMessage: "You must name your Community");
return;
}else{
func generateRandomStringWithLength(length: Int) -> String {
var randomString = ""
let letters = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"
for _ in 1...length {
let randomIndex = Int(arc4random_uniform(UInt32(letters.characters.count)))
let a = letters.index(letters.startIndex, offsetBy: randomIndex)
randomString += String(letters[a])
}
return randomString
}
let communityCode = generateRandomStringWithLength(length: 6)
passwordTextField.text = communityCode
let myUrl = URL(string: "http://www.quasisquest.uk/KeepScore/createCommunity.php?");
var request = URLRequest(url:myUrl!);
request.httpMethod = "POST";
let postString = "communityname=\(communityName!)&code=\(communityCode)&email=\(myEmail!)";
request.httpBody = postString.data(using: String.Encoding.utf8);
let task = URLSession.shared.dataTask(with: request) { (data, response, error) in
DispatchQueue.main.async
{
if (try! JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? [String:AnyObject]) != nil {
let myAlert = UIAlertController(title: "Community Registered", message: "Community Code:\(communityCode)", preferredStyle: UIAlertControllerStyle.alert);
let okAction = UIAlertAction(title: "OK", style: UIAlertActionStyle.default){(action) in
self.dismiss(animated: true, completion: nil)
}
myAlert.addAction(okAction);
self.present(myAlert, animated: true, completion: nil)
}
}
}
task.resume()
}
}
}
Try to call reload data in didSet. E.g. var communities = [] { didSet { yourtableview.realoadData()
}
}