I am Presenting a View with some text field and button where user can enter some data in that text field and when the user will click the save button that data will be saved in NSUserdefaults and show it on another view but its not working.. Any suggestion plz..
View2 code Which is presented over view1
//The default key value
var _billingAddress = "billingAddress"
//The address text field in present view
#IBOutlet weak var address: UITextField!
//The button action code
#IBAction func saveBtn(sender: AnyObject) {
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setValue(address.text, forKey:_billingAddress)
}
View1 code to access the key value data
//Label where i want to show the saved value
#IBOutlet weak var billingAddresh: UILabel!
let defaults = NSUserDefaults.standardUserDefaults()
if let name = defaults.stringForKey(_billingAddress)
//Here it shows the error use of unresolved identifier _billingAddress
{
billingAddresh.text = name
}
Its not showing any value
Thank you for the help..
when you add on that time we need the defaults.synchronize()
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setValue(address.text, forKey:"billingAddress")
// if you want use else ignore
defaults.synchronize()
retrieve is
let defaults = NSUserDefaults.standardUserDefaults()
if let name = defaults.stringForKey("billingAddress") // not "_billingAddress"
{
billingAddresh.text = name
}
// no need in here
defaults.synchronize()
Related
I am using some values to perform some calculations. For testing purposes I show in Label1 a value as string, since it is stored as a string and in Label2 I show a casted value as a Double since I need them at the end as doubles for my calculations.
The weird thing is, that when I access the ViewController the first time it doesn't show any values. But if I go back and klick on it again using the navigation controller it actually works. But I need the values right away cause my original intention is as I said, not showing some labels but rather making some calculations with it.
I made a little gif to show you what the problem is but I have problem with adding photos. Basically what happens is, that I click on the ViewController with the labels and nothing is showed. I go back and press again and the values will be showed in the labels.
Why is that and how can it be showed right away/ used for calculations right away
Thanks for the help. :)
class AHPfinalPreferencesViewController: UIViewController {
var ahpPrios = [AHPPriorityStruct]()
let decoder = JSONDecoder()
#IBOutlet weak var label1: UILabel!
#IBOutlet weak var label2: UILabel!
let ajkpXc = globaLajkpXc
let ajkpXijr = globaLajkpXijr
let valueA = globaLajkpXc
let valueB = Double(globaLajkpXijr)
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
UserService.ahpPref(for: User.current) { (ahpPrios) in
self.ahpPrios = ahpPrios
print("This is our AHP PRIOS", ahpPrios)
for ahpPrio in ahpPrios {
print(ahpPrio)
}
print("this is the global ajk. ", self.ajkpXc)
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Mark: - Get Data
label1.text = valueA
label2.text = "\(String(describing: valueB))"
// MARK: - Set Values for calculation
// setValues()
// ahpCalculation()
}
}
Could it be because of the globalVariables? I know that it is not the right way to do it but for my purposes its absolutely "okay"
import Foundation
import FirebaseAuth.FIRUser
import FirebaseDatabase
import FirebaseUI
import FirebaseAuth
import CodableFirebase
var globaLajkpXc: String = String()
var globaLajkpXijr: String = String()
var globaLajkpXqpa: String = String()
struct UserService {
static func ahpPref(for user: User, completion: #escaping ([AHPPriorityStruct]) -> Void) {
let ref = Database.database().reference().child("AHPRatings").child(user.uid)
ref.observe(DataEventType.value, with: { snapshot in
guard let value = snapshot.value else { return }
do {
let ahpPrios = try FirebaseDecoder().decode(AHPPriorityStruct.self, from: value)
print(ahpPrios)
// MARK: - lets store the values in the actual constants :)
let ajkpXc = ahpPrios.ajkpXc
let ajkpXijr = ahpPrios.ajkpXijr
let ajkpXqpa = ahpPrios.ajkpXqpa
globaLajkpXc = ajkpXc ?? "no Value"
globaLajkpXijr = ajkpXijr ?? "no Value"
globaLajkpXqpa = ajkpXqpa ?? "no Value"
} catch let error {
print(error)
}
})
}
}
[1]: https://i.stack.imgur.com/VKxaE.png
You are calling UserService's ahpPref in your controller's viewWillAppear. BUT you are attempting to put your valueA (globaLajkpXc's value) to your label in your controller's viewDidLoad.
So what does that mean? Do you know which of these two controller's life cycle method gets called and when they do get called?
To solve your problem, have your label assigning value code
label1.text = globaLajkpXc
move in the completion block of your ahpPref (in the viewWillAppear).
Here's the Apple's documentation about the UIViewController's lifecycle: https://developer.apple.com/library/archive/referencelibrary/GettingStarted/DevelopiOSAppsSwift/WorkWithViewControllers.html
Also, below this line: globaLajkpXqpa = ajkpXqpa ?? "no Value"
add your completion call, like:
completion([ahpPrios]).
This should make my answer above work.
I am trying to load a value that has been inputted by the user in the viewDidLoad via a String. I am using UserDefaults to save the users value that they input into a UITextField (userValue), I then save this to the String 'search'. I am able to print out the value of search in the GoButton function, and it works fine, but when I load my ViewController as new, the value of 'search' is equal to nil. The aim here is to have the users previous search saved, and loaded into the UITextField (that is used as a search box) upon loading the ViewController.
Code Below:
class ViewController: UIViewController {
#IBOutlet weak var userValue: UITextField!
var search: String!
}
viewDidLoad:
override func viewDidLoad() {
if (search != nil)
{
userValue.text! = String (search)
}
}
Button Function:
#IBAction func GoButton(_ sender: Any) {
let userSearch: String = userValue.text!
let perference = UserDefaults.standard
perference.set(userSearch, forKey: "hello")
perference.value(forKey: "hello")
let value = perference.value(forKey: "hello") as! String
search = value
print (search) // <<this works, it prints out the users search value
}
#VishalSharma has the right idea, but the code should probably look more like…
override func viewDidLoad() {
super.viewDidLoad()
if let search = UserDefaults.standard.string(forKey: "hello") {
userValue.text = search
}
}
or even more simply…
userValue.text = UserDefaults.standard.string(forKey: "hello")
When you load, search is effectively nil.
So either you read userDefaults in viewDidload or you come through a segue: then you can load search in the prepare.
I've always found it convenient and useful to store all UserDefault properties as an extension within the same file along with their getters and setters. It is far easier to maintain, use and read. by using the #function keyword for the key you are referencing the variable's name and not a string that can be accidentally changed somewhere else in code.
UserDefaults.swift
import Foundation
// An Extension to consolidate and manage user defaults.
extension UserDefaults {
/// A value Indicating if the user has finished account setup.
/// - Returns: Bool
var finishedAcountSetup: Bool {
get { return bool(forKey: #function) }
set { set(newValue, forKey: #function) }
}
/// The hello text at the start of the application.
/// - Returns: String?
var helloText: String? {
get { return string(forKey: #function) }
set {set(newValue, forKey: #function) }
}
//etc...
}
When you use these values reference the standard settings:
//Setting
UserDefaults.standard.helloText = "Updated Hello Text"
// Getting
// for non-optional value you can just get:
let didCompleteSetup = UserDefaults.standard.finishedAcountSetup
// Otherwise, safely unwrap the value with `if-let-else` so you can set a default value.
if let text = UserDefaults.standard.helloText {
// Ensure there is text to set, otherwise use the default
label.text = text
} else {
// helloText is nil, set the default
label.text = "Some Default Value"
}
obviously, it provides nil because when view controller load the search is nil try this.
let perference = UserDefaults.standard
override func viewDidLoad() {
super.viewDidLoad()
if (perference.value(forKey: "hello") != nil) {
search = perference.value(forKey: "hello") as! String
userValue.text! = String (search)
}
}
I am making a tip calculator and the requirement is to have a settings page to go along with the calculator. In the calculator there are three options implemented by a segmented control when each is selected, the value of the tip and the value of the total change. In my settings tab I would like to be able to have the user save their default tip percentage. I know I need to use NSUserdefaults, however I do not know how to do this using two different pages (or one page for that matter). If what I want to achieve is unclear, please let me know I tried my best explaining it thoroughly.
Here is the code for the view controller:
#IBAction func onEditingChanged(sender: AnyObject) {
var tipPercentages = [0.18, 0.2, 0.22]
let tipPercentage = tipPercentages[tipControl.selectedSegmentIndex]
let billAmount = billField.text!._bridgeToObjectiveC().doubleValue
let billAmt = billAmount
let tip = billAmt * tipPercentage
let total = billAmt + tip
tipLabel.text = String(format:"$%.2f", tip)
totalLabel.text = String(format:"$%.2f", total)
}
Here is what I have for the settingsViewController:
import UIKit
class SettingsViewController: UIViewController {
#IBOutlet weak var defaultTipControl: UISegmentedControl!
#IBAction func actDefaultTipCont(sender: AnyObject) {
var tipPercentages = [0.18, 0.2, 0.22]
var tipPercentage = [defaultTipControl.selectedSegmentIndex]
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(tipPercentage, forKey: "tippingDefault")
defaults.setInteger(123, forKey: "tippingInteger")
defaults.synchronize()
}
I have just been messing around with the settingsViewController trying to get it to work, it will likely all have to be redone. Here are pictures of the views of the two different pages:
Entry View
Settings Page
Thank you ahead of time for the help!
To save then retrieve the data, you want to do something like this:
let valueToSave = tipAmount;
let defaults = NSUserDefaults.standardUserDefaults()
defaults.setObject(valueToSave, forKey: "tipAmount")
Then to retrieve it and use it on your main control (for example) do this:
let defaults = NSUserDefaults.standardUserDefaults()
tipAmount = defaults.objectForKey("tipAmount")
the valueForKey method returns whatever you saved in that key previously
NSUserdefaults is basically just a dictionary that will persist over different launches, so just check if you have saved a value for a specific key to access it
I am using Swift with SQLite.swift. I have the following UIViewController:
class LoginViewController: UIViewController {
#IBOutlet weak var emailField: UITextField!
func setEmailAddress(email:String){
emailField.text = email
}
override func viewDidLoad() {
MySQLite().updateLatestEmailAddressFromUserTable() // breaks here (email is in console, though...)
}
}
Then I am trying to update it's value (through the setEmailAddress function) from another class:
class MySQLite {
func updateLatestEmailAddressFromUserTable(){
let dbPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String
let db = Database("\(dbPath)/db.sqlite3")
let users = db["users"]
let id = Expression<Int>("id")
let email = Expression<String>("email")
let time = Expression<Int>("time")
for user in users.limit(1).order(time.desc) {
println(user[email]) // this works, correctly outputs in console: email#domain.com
LoginViewController().setEmailAddress(user[email]) // breaks here
}
}
}
above code gives me the following error
fatal error: unexpectedly found nil while unwrapping an Optional value
To explain a little further: I am retrieving the most recent entry in SQLite table to get the user's email address and update the text field in the login view controller. This allows for easier log in for returning users.
I have been struggling with this for over 2 hours now and trying various things. The main problem I believe is that when I try to simply return the email address as string from my second function and set the field directly from LoginViewController, it doesn't work (SQLite related code was not "executed" yet I believe).
possibly related thread (Obj-C):
set UITextField.text from another class
Here whats happening LoginViewController().setEmailAddress(user[email]) creates new instance of LoginViewController which is not same as your current LoginViewController.
Why don't you make protocol and define as delegate in MySQLite
And LoginViewController will have implementation of update method. Pass the delegate to MySqlite
In MySQLite when you get the value form database call the delegate update method.
Example
MySQLite
protocol loginDelegate
{
func update(NSString)
}
class MySQLite {
var delegate:loginDelegate?
func updateLatestEmailAddressFromUserTable(){
let dbPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String
let db = Database("\(dbPath)/db.sqlite3")
let users = db["users"]
let id = Expression<Int>("id")
let email = Expression<String>("email")
let time = Expression<Int>("time")
for user in users.limit(1).order(time.desc) {
println(user[email]) // this works, correctly outputs in console: email#domain.com
if((delegate) != nil)
{
delegate?.update("example#example.com")
}
}
}
}
class LoginViewController: UIViewController,loginDelegate {
#IBOutlet weak var emailField: UITextField!
func setEmailAddress(email:String){
emailField.text = email
}
override func viewDidLoad() {
var mySQLite: MySQLite=LoginClass();
mySQLite.delegate=self;
[mySQLite .updateLatestEmailAddressFromUserTable()];
}
func update(email: NSString) {
println(email);
emailField.text = email
}
}
Make sure that the view which has the emailField has been instantiated on the screen.
#IBOutlet weak var emailField: UITextField!
This is an optional, which will be nil until the storyboard or nib for it is loaded. I assume OnBoardingRegistrationFormController is an instance of your LoginViewController class?
I see you've accepted an answer, but in this case creating a protocol is likely overkill. If sqlite is your model, why not just have the function return a value, and then you can assign the value to the text field in the controller. ex.
class LoginViewController: UIViewController {
#IBOutlet weak var emailField: UITextField!
override func viewDidLoad() {
emailField.text = MySQLite().updateLatestEmailAddressFromUserTable()
}
}
class MySQLite {
func updateLatestEmailAddressFromUserTable() -> String{
let dbPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true).first as String
let db = Database("\(dbPath)/db.sqlite3")
let users = db["users"]
let id = Expression<Int>("id")
let email = Expression<String>("email")
let time = Expression<Int>("time")
for user in users.limit(1).order(time.desc) {
println(user[email]) // this works, correctly outputs in console: email#domain.com
return user[email]
}
}
}
The issue is that LoginViewController's view isn't loaded when you try to assign a text to the textField. i.e: emailField is nil and unwrapping nil values leads to a runtime crash (since the outlet has not been connected to it's storyboard/xib counterpart).
I am trying to save an integer so it shows up after I switch the page or close the game. I made this to change the number but how do I save that number when I switch pages and load it when I go back to that page.
Change Code:
#IBAction func MoneyPress(sender: AnyObject) {
Money += 1
var MoneyNumberString:String = String(format: "Dollars:%i", Money)
self.DollarsLabel.text = (string: MoneyNumberString)
}
If it isn't a lot of data, the strategy I use to save data, pass it between pages, and persist it between app runs is to store the value in NSUserDefaults.
Setting A Value: When you first get or when you change the data, store it in NSUserDefaults.
#IBAction func MoneyPress(sender: AnyObject) {
Money += 1
var MoneyNumberString:String = String(format: "Dollars:%i", Money)
self.DollarsLabel.text = (string: MoneyNumberString)
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults() //This class variable needs to be defined every class where you set or fetch values from NSUserDefaults
defaults.setObject(MoneyNumberString, forKey: "money")
defaults.synchronize() //Call when you're done editing all defaults for the method.
}
Loading A Value: When you need to get the values, just grab it from NSUserDefaults.
#IBAction func loadButton(sender: UIButton) {
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
var money = defaults.valueForKey("money") as? String
dollarLabel.text! = money
}
To remove the stored data, all you need to do is call the removeObjectForKey function for each key previously set.
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
defaults.removeObjectForKey("money")
defaults.synchronize()
Helpful Source on NSUserDefaults:
NSUserDefulats Class Reference: Link here.
You can use NSUserDefaults for this.
Save Value
NSUserDefaults.standardUserDefaults().setInteger(money, forKey: "MoneyKey");
Retrieve Value
NSUserDefaults.standardUserDefaults().integerForKey("MoneyKey");
So can retrieve the value in viewDidLoad and load the data:
override func viewDidLoad()
{
super.viewDidLoad()
loadWebView()
var money = NSUserDefaults.standardUserDefaults().integerForKey("MoneyKey");
}
When you come to the view for the first time the value of money will be 0.
Remove Value
If you need to remove a value from NSUserdefaults, you can use:
NSUserDefaults.standardUserDefaults().removeObjectForKey("MoneyKey")