Currently, my code for NSUserDefaults work fine. The only issue I have now is how can I send the data store to another page? I can get it now save the data, but how do I retrieve that same data via NSUserDefaults to a secondary page?
import UIKit
class MainTableViewController: UITableViewController, UITextFieldDelegate {
let userDefaults = NSUserDefaults.standardUserDefaults()
#IBOutlet weak var name: UITextField!
#IBAction func btnSave() {
if name.text == "" {
let alert = UIAlertController(title: "Data", message: "Missing Name.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
}
else {
userDefaults.setObject(name.text, forKey:"name")
userDefaults.synchronize()
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(animated: Bool) {
name.text = userDefaults.stringForKey("name")
}
}
You can retrieve your data from your second page with same code.
Create your NSUserDefaults in second page like this ;
First of all add these codes to your FirstPage in IBAction func. Don't use the if else statement for test.
UserDefaults.standard.set("yourValue", forKey: "yourKey")
When you press the button it should be save your data with your key.
In the secondPage you can retrieve your data in your viewDidLoad method like this;
override func viewDidLoad() {
super.viewDidLoad()
print(UserDefaults.standard.value(forKey: "yourKey") ?? "defaultValue in case key is not found")
print(value)
}
It should be print your value to your console (bottom window in your xcode) when the secondPage is open. If you still can't retrieve your value please share to me a your storyboard picture. I want to see your connections.
Related
I've been trying to present a UIAlertController when user entered wrong password for their account, the UIAlertController is located in one separate file inside a Model group which I extend the UIViewController class to add this alert functionality to it. I also has another file inside my model group namely LogIn which I wrote all the logic behind the login process so that I can call it to my LogInVC. However, I got an error of "Attempt to present on whose view is not in the window hierarchy!" whenever the function get call inside my LogInVC. I'm trying to make my project in MVC and I know what caused this error but I just don't know how to fix it. May anyone tell me how to fix this problem?
Alert
import Foundation
import UIKit
extension UIViewController {
//MARK: - Not Enough Information Alert
func notEnoughInfo(title: String, message: String) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let OKAction = UIAlertAction(title: "OK", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
//MARK: - Incorrect Username and Password
func wrongInfo(title: String, message: String) {
let alertController = UIAlertController(title: title, message: message, preferredStyle: .alert)
let OKAction = UIAlertAction(title: "Try again", style: .default, handler: nil)
alertController.addAction(OKAction)
self.present(alertController, animated: true, completion: nil)
}
LogIn
import Foundation
import Firebase
class LogIn: UIViewController{
let db = Firestore.firestore()
//MARK: - userValidation()
func userValidation(Username:String, Password:String){
db.collection("users").getDocuments() { (querySnapshot, err) in
if let err = err {
print("Error getting documents: \(err)")
} else {
if let snapShotDocument = querySnapshot?.documents {
for doc in snapShotDocument {
let data = doc.data()
if let username = data[C.username] as? String, let password = data[C.password] as? String {
if Username == username, Password == password {
print("Log in Successfully")
}
else {
self.wrongInfo(title: "Incorrect password", message: "Try again please")
}
}
}
}
}
}
}
}
LogInVC
import UIKit
import Firebase
class LogInVC: UIViewController {
#IBOutlet weak var emailTextField: UITextField!
#IBOutlet weak var passwordTextField: UITextField!
#IBOutlet weak var logInBtn: UIButton!
let db = Firestore.firestore()
let logIn = LogIn()
override func viewDidLoad() {
super.viewDidLoad()
//logInBtn.layer.cornerRadius = logInBtn.frame.height/5
}
#IBAction func logInBtn(_ sender: UIButton) {
if let username = emailTextField.text, let password = passwordTextField.text{
if username.isEmpty || password.isEmpty{
notEnoughInfo(title: "Not enough information", message: "Please fill in all the necessary information.")
}else{
logIn.userValidation(Username: username, Password: password) //here is where problem occured
//move to another viewcontroller
}
}
}
#IBAction func signUpBtn(_ sender: UIButton) {
let push = storyboard?.instantiateViewController(withIdentifier: C.signUpVC) as! SignUpVC
push.modalPresentationStyle = .fullScreen
present(push, animated: true, completion: nil)
}
} //ends of class
You need to first dismiss the current present alert or present controller. currently you are trying to present controller over a controller that's why it shows this error. Don't present . remove this line from self.wrongInfo(title: "Incorrect password", message: "Try again please") from LogIn.
try this and you can comment again if there is anything regarding this.
When the user what to sign up or login it has error and get this error in the output "this class is not key value coding-compliant for the key containerView."
this is the login code also signup has the same error and l'm sure it's a right codes.
import UIKit
import Firebase
class LoginViewController: UIViewController {
#IBOutlet var Aemeil: UITextField!
#IBOutlet var Apassword: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func login (_ sender : Any){
guard let email = Aemeil.text, let password = Apassword.text
else {
print("Form is not valid")
return
}
Auth.auth().signIn(withEmail: email , password: password , completion: { (user,error) in
if error == nil{
let vc = self.storyboard?.instantiateViewController(withIdentifier: "AHome");
self.present(vc!, animated: true, completion: nil);
print("Home page open")
}
else{
let alertController = UIAlertController(title: "Error", message: error?.localizedDescription, preferredStyle: .alert)
let defaultAction = UIAlertAction(title: "Yes", style: .cancel, handler: nil)
alertController.addAction(defaultAction)
self.present(alertController, animated: true, completion: nil)
}
})
}
}
You have created a binding from a storyboard element, to an element in the corresponding swift file, with the name containerView. After that you have deleted the containerView variable in your swift file, but the binding still exists in the storyboard.
To solve this problem go to your storyboard, click on the view controller, like below:
After that, click on the connection inspector, to see all bindings of your viewcontroller and delete the binding from the containerView:
I have faced the similar problem, I created a segmentview under which I've kept a containerView and removed the default segue that came along with that container view. After that I renamed the container view controller name and connected as show segue. This was the problem which caused me to face this issue. When I changed the show segue to Embed segue the problem resolved.
I just started working with Swift a few months ago and to help me learn the language better, I am creating a chat application. For the sign-in method, I am using the phone number method. I have the onboarding process already created but I want to implement something that lets me check if the user has already created an account with that phone number. If they have, I want to segue them to the main view controller, skipping the onboarding view controller.
Here is my code for the phone verification view controllers (One is for inputting a phone number and the other is for inputting the code sent to the user's phone):
import UIKit
import Firebase
import FirebaseAuth
import FirebaseDatabase
class PhoneVerification: UIViewController {
//MARK: Properties
#IBOutlet weak var phoneNumber: UITextField!
#IBOutlet weak var code: UITextField!
#IBOutlet weak var verifyCodeImage: UIButton!
#IBOutlet weak var sendCodeImage: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
//MARK: Format phone text field
var phoneFormatter = PhoneNumberFormatter()
#IBAction func formatPhoneNumber(_ sender: UITextField) {
sender.text = phoneFormatter.format(sender.text!, hash: sender.hash)
}
//MARK: When send secret code button is pressed
#IBAction func sendCode(_ sender: Any) {
let submitPhoneNumber = "+1" + phoneNumber.text!
if submitPhoneNumber.count > 9{
PhoneAuthProvider.provider().verifyPhoneNumber(submitPhoneNumber, uiDelegate: nil) {(verificationID, error) in
if error != nil {
print(error!)
}else{
UserDefaults.standard.set(verificationID, forKey: "authVerificationID")
self.performSegue(withIdentifier: "phoneCode", sender: self)
}
}
}else{
let phoneNumAlert = UIAlertController(title: "Please enter your phone number", message: "You must enter your phone number to continue.", preferredStyle: .alert)
phoneNumAlert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
self.present(phoneNumAlert, animated: true)
}
}
let verificationID = UserDefaults.standard.string(forKey: "authVerificationID")
//MARK: When verify code button is pressed
#IBAction func verifyCode(_ sender: Any) {
let credential = PhoneAuthProvider.provider().credential(
withVerificationID: verificationID!,
verificationCode: code.text!)
//This is where the user is signed in if the verification code is correct
Auth.auth().signIn(with: credential) { (user, error) in
if let error = error {
let invalidCodeAlert = UIAlertController(title: "That code is incorrect", message: "Please input the correct code", preferredStyle: .alert)
invalidCodeAlert.addAction(UIAlertAction(title: "Ok", style: .cancel, handler: nil))
self.present(invalidCodeAlert, animated: true)
print(error)
return
}
//MARK: User is signed in
print("Phone number: \(String(describing: user?.phoneNumber))")
self.performSegue(withIdentifier: "accountCreated", sender: self)
}
}
}
All help is very much appreciated! Thanks!
Let's say you hold user data at the users ref. When the user signs in check to see if they have any data there, if they do then they are an existing user, if they don't then it is a new account:
Auth.auth().signIn(with: credential, completion: { [weak self](authDataResult, error) in
if let error = error { return }
guard let safeAuthDataResult = authDataResult else { return }
// 1. get the signed in user's userId
let userId = safeAuthDataResult.user.uid
// 2. check to see if their userId exists at the user's path
let usersRef = Database.database().reference().child("users").child(userId)
usersPublicDataRef.observeSingleEvent(of: .value, with: { (snapshot) in
// 3. this is a new user
if !snapshot.exists() {
// *** what you should do here is update the user's ref with some sort of data
} else {
// 4. this is an existing user
}
})
})
You can use FirebaseAuthUI and FirebasePhoneAuthUI to registered your mobile number into firebase. It's default method and UI which is provided by Firebase itself. So you don't have to worry about rest of things.
You just have to installed PhoneAuthUI using pod and write down below code to registered mobile number:
FUIAuth.defaultAuthUI()?.delegate = self
let phoneProvider = FUIPhoneAuth.init(authUI: FUIAuth.defaultAuthUI()!)
FUIAuth.defaultAuthUI()?.providers = [phoneProvider]
let currentlyVisibleController = self.navigationController?.visibleViewController
phoneProvider.signIn(withPresenting: currentlyVisibleController!, phoneNumber: nil)
Once your mobile number is registered then you will get a callback on this method:
func authUI(_ authUI: FUIAuth, didSignInWith user: User?, error: Error?) {
if user != nil{
// here we need to check if current user is registered or not.
var ref: DatabaseReference!
ref = Database.database().reference()
let userID = Auth.auth().currentUser?.uid
}) { (error) in
print(error.localizedDescription)
}
}else if error != nil{
print(error?.localizedDescription)
}
}
For more information, you can see this tutorial.
For some reasons, I can't seem to get my NSUserDefaults to work correctly under Swift 2.0. It work fine under the older version, but under Swift 2.0, it doesn't work. I know the coding has been changed for Swift 2.0, but for some reason, all the information filled in the tableview goes away once I leave that page. Any suggestions?
import UIKit
class MainTableViewController: UITableViewController, UITextFieldDelegate {
#IBOutlet weak var name: UITextField!
#IBAction func btnSave() {
let userDefaults = NSUserDefaults.standardUserDefaults()
if name.text == "" {
let alert = UIAlertController(title: "Data", message: "Missing Name.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
let userDefaults = NSUserDefaults.standardUserDefaults()
NSUserDefaults.standardUserDefaults().setObject(name, forKey:"name")
userDefaults.synchronize()
}
override func viewDidLoad() {
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(" ", forKey: "name")
super.viewDidLoad()
}
}
Perhaps try this
import UIKit
class MainTableViewController: UITableViewController, UITextFieldDelegate {
let userDefaults = NSUserDefaults.standardUserDefaults()
#IBOutlet weak var name: UITextField!
#IBAction func btnSave() {
if name.text == "" {
let alert = UIAlertController(title: "Data", message: "Missing Name.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
} else {
userDefaults.setObject(name.text, forKey:"name")
userDefaults.synchronize()
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewDidAppear(animated: Bool) {
name.text = userDefaults.stringForKey("name")
}
}
In your viewDidLoad you're erasing the info in name, so everytime you enter your view, it will get deleted.
override func viewDidLoad() {
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(" ", forKey: "name")
super.viewDidLoad()
}
Also, since name is a UITextField and not a String, when you're saving your name, it should be done like this:
NSUserDefaults.standardUserDefaults().setObject(name.text, forKey:"name")
instead of this:
NSUserDefaults.standardUserDefaults().setObject(name, forKey:"name")
Also, inside your btnSave() method, you're only saving the name.text if it's equal to "". So if you enter any other information, it won't be saved. I'd recommend modifying it so it looks something like this (you could use guard instead of if name.text also):
#IBAction func btnSave() {
if name.text == "" {
let alert = UIAlertController(title: "Data", message: "Missing Name.", preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: nil))
self.presentViewController(alert, animated: true, completion: nil)
return
}
let userDefaults = NSUserDefaults.standardUserDefaults()
userDefaults.setObject(name.text, forKey:"name")
userDefaults.synchronize()
}
P.S: Remember that NSUserDefaults is intended for user preferences. I'd recommend against saving large amounts of data into NSUserDefaults.
I am trying to present an Alertcontroller that prompts the user for a filename and then use the filename elsewhere in the program. I have been trying numerous variations of the following code:
import UIKit
class ViewController: UIViewController {
var shortName: String!
#IBAction func saveFile(sender: AnyObject) {
//request filename with alert
var alertController:UIAlertController?
alertController = UIAlertController(title: "Enter File",
message: "Enter file name below",
preferredStyle: .Alert)
alertController!.addTextFieldWithConfigurationHandler(
{(textField: UITextField!) in
textField.placeholder = ""
})
let action = UIAlertAction(title: "Submit",
style: UIAlertActionStyle.Default,
handler: {[weak self]
(paramAction:UIAlertAction!) in
if let textFields = alertController?.textFields{
let theTextFields = textFields as [UITextField]
let enteredText = theTextFields[0].text
self!.shortName = enteredText //trying to get text into shortName
print(self!.shortName) // prints
}
})
alertController?.addAction(action)
self.presentViewController(alertController!,
animated: true,
completion: nil)
//do some stuff with the input
print(shortName) //THIS RETURNS nil if uncommented. comment out to avoid crash
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
I have thoroughly researched this and can't find how to either:
get the string value of shortName out of the UIAlertAction closure and into the shortName (I know that the current "self!.shortName" is unavailable outside the closure - doesn't matter what name I use - can't get it out)
If you run the program "as-is", the print(shortName) line will cause a crash due to unwrapping of nil. How can I get the alert to "wait" for input?
Most of the posted "solutions" have the same problem - they don't actually get the text input out of the closure and into a variable that can be accessed by the rest of the program.
thanks
Of course you get crash, shortName is nil while Submit button isn't pressed. You can try something like this:
#IBAction func saveFile(sender: AnyObject) {
var alertController:UIAlertController?
alertController = UIAlertController(title: "Enter File",
message: "Enter file name below",
preferredStyle: .Alert)
alertController!.addTextFieldWithConfigurationHandler(
{(textField: UITextField!) in
textField.placeholder = ""
})
let action = UIAlertAction(title: "Submit",
style: UIAlertActionStyle.Default,
handler: {[weak self]
(paramAction:UIAlertAction!) in
if let textFields = alertController?.textFields{
let theTextFields = textFields as [UITextField]
let enteredText = theTextFields[0].text
self!.shortName = enteredText //trying to get text into shortName
print(self!.shortName) // prints
self?.handleText()
NSOperationQueue.mainQueue().addOperationWithBlock({
self?.handleTextInMainThread()
})
}
})
alertController?.addAction(action)
self.presentViewController(alertController!,
animated: true,
completion: nil)
}
func handleText() {
print(self.shortName)
}
func handleTextInMainThread() {
print(self.shortName)
}
You have use NSOperationQueue if you want to work with UI inside handleTextInMainThread after user's input.
I think it is timing. You tried to print shortName right after presenting the alert. At that time the value is not set yet.
You can either use semaphore to wait till it is set or do whatever you want to do in the action closure for "submit".