I am trying to store the value of the textfield String to Firebase but the debugger says "unable to read data (String)." Here is my code.
#IBAction func btnSelect(_ sender: Any) {
var Description: String = TextField.text ?? ""
}
Try declaring Description first outside of viewDidLoad(), then initialize it inside the function btnSelect()
I created an example without using the storyBoard and it is working
let TextField : UITextField = {
let txt = UITextField()
txt.text = "Hello World"
return txt
}()
var Description: String?
override func viewDidLoad() {
btnSelect()
}
func btnSelect() {
Description = TextField.text
print(Description)
}
If this does not work for you, it must be something to do with either how you are initializing TextField or something with your storyBoard.
Related
Trying to save the user's textView.text into Realm. Figured if I call my save function into the textFieldDidEndEditing function, it would trigger my Realm database to save it. Function runs ok (prints "Saved Successfully" when I end editing), but when I close out and come back, none of the data is there.
import UIKit
import RealmSwift
class NoteViewController: UIViewController, UITextViewDelegate {
var textView = UITextView()
var notes: Results<Notes>?
let realm = try! Realm()
var selectedNote: Menu? {
didSet {
loadNotes()
}
}
#IBOutlet weak var theTextView: UITextView!
override func viewDidLoad() {
super.viewDidLoad()
loadNotes()
self.textView.delegate = self
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
self.view.endEditing(true)
}
override func viewDidDisappear(_ animated: Bool) {
saveNote()
}
func textViewDidBeginEditing(_ textView: UITextView) {
}
func textViewDidEndEditing(_ textView: UITextView) {
saveNote()
}
//MARK: - Data Manipulation
func loadNotes() {
notes = realm.objects(Notes.self)
textView.reloadInputViews()
}
func saveNote() {
if let currentNote = self.selectedNote {
do {
try self.realm.write {
let newNote = Notes()
newNote.body = theTextView.text!
newNote.dateCreated = Date()
currentNote.notes.append(newNote)
print("Saved successfully")
}
} catch {
print("Error saving note body, with \(error)")
}
}
}
}
Realm File:
class Notes: Object {
#objc dynamic var body: String = ""
#objc dynamic var dateCreated: Date?
var parent = LinkingObjects(fromType: Menu.self, property: "notes")
}
Menu Realm File:
class Menu: Object {
#objc dynamic var name: String = ""
#objc dynamic var preview: String = ""
let notes = List<Notes>()
}
'''
It looks like you are using a storyboard to create your layout.
Get rid of var textView = UITextView() and textView.reloadInputViews() then.
Replace self.textView.delegate = self with theTextView.delegate = self in viewDidLoad().
To check the content of theTextView modify your print statement:
print("Saved successfully: \(theTextView.text!)")
If there is no text printed right after "Saved successfully: " then check Interface builder for theTextView: verify the outlet of theTextView and that this is actually the UITextView you are using (since your app does print something it looks like it is hooked up somehow because otherwise it would crash in newNote.body = theTextView.text!).
I think you also forgot to actually initialise theTextView with notes.body.
Try to modify loadNotes() like this:
func loadNotes() {
notes = realm.objects(Notes.self)
theTextView.text = notes.body
}
I have a task app that I am working on. users can create task and in turn create items under their categories. I am using realm as my data storage but I want to be able to pass some details from the selected category to the create items viewcontroller. I decided to print the selected category to the console but it prints nil and I dont know why. Below is my code.
class CategoryModel: Object {
#objc dynamic var id = UUID().uuidString
#objc dynamic var name: String = ""
#objc dynamic var color: String = ""
#objc dynamic var isCompleted = false
let items = List<TodoListModel>()
override static func primaryKey() -> String? {
return "id"
}
}
Items VC
var selectedCategory: CategoryModel?
override func viewDidLoad() {
super.viewDidLoad()
print("Selected Category: \(String(describing: selectedCategory))")
}
I do not know why it keeps printing nil
Because you don't give it a value when you show the itemsVC
let item = ItemsVC() // if VC is inside IB use self.storyboard?.instantiate.....
item.selectedCategory = // set here or inside prepareForSegue if you use segues
// here present
You can parse in this way;
Items VC
let realm = try! Realm()
var category:Results< CategoryModel>?
override func viewDidLoad() {
super.viewDidLoad()
loadCategory()
}
func loadCategory(){
category = realm.objects(CategoryModel.self)
//tableView.reloadData() for example
}
//category?[indexPath.row].name for example using
I´ve a webrequest with jsonserialization, after that, a for-in fetch process.
In whole this takes approximately 5-7 seconds.
After that i want to refersh my tableview in Viewcontroller.
The scheme of the function looks like this.
public struct Container {
let name: String
let symbol: String
let rank: String
}
public var dataArray = [Container]()
func fetchNewData() {
var view = ViewController()
// WebbRquest...
// Json serialization...
// the following list is much longer, will take a while...
for items in json {
let name = items["name"] as? AnyObject;
let symbol = items["symbol"] as? AnyObject;
let rank = items["rank"] as? AnyObject;
let result = Container(name: name! as! String, symbol: symbol! as! String,rank: rank! as! String)
dataArray.append(result)
}
// Now, after alle the work is done, i want to reload the tableview in Viewcontrller:
view.reload()
// Here i´m getting error, because nothing will be executed after return.
}
How can I call the reload function, after the webrequest process is finished? Because after the return, the function doesn´t execute anything anymore.
And no other function will "know" when the fetchNewData() function is finished.
Thanks for any help!
#IBAction func updateButton(_ sender: Any) {
fetchNewData()
}
According Phillipps suggestion, I had to modify the #IBAction func a little bit.
But now it´s working. Awesome!
Here the full working version:
public struct Container {
let name: String
let symbol: String
let rank: String
}
public var dataArray = [Container]()
func fetchNewData(completion:#escaping ([Container])->()) {
var view = ViewController()
// WebbRquest...
// Json serialization...
// the following list is much longer, will take a while...
for items in json {
let name = items["name"] as? AnyObject;
let symbol = items["symbol"] as? AnyObject;
let rank = items["rank"] as? AnyObject;
let result = Container(name: name! as! String, symbol: symbol! as! String,rank: rank! as! String)
dataArray.append(result)
}
completion(dataArray)
}
This is the actionFunc:
#IBAction func upDateButton(_ sender: Any) {
let data = dataArray
fetchNewData() {_ in (data)
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
Here's a start. It will be vague because I'm making guesses about code I can't see, but you may be able to convert it to your own needs.
Change the fetch function so that it takes a closure as a parameter:
func fetchNewData(completion:([Container])->()) {
...note that the closure will accept the data array when it's called.
After you have your json all parsed, you then invoke the closure:
dataArray.append(result)
}
completion(dataArray)
The "magic" is in the view controller where you tell fetchNewData what to do when it's finished. Something like:
#IBAction func updateButton(_ sender: Any) {
fetchNewData() {(data)
// Save the data where the view controller can use it
self.tableArray = data
// Main queue for UI update
DispatchQueue.main.async {
self.tableView.reloadData()
}
}
}
Note that the closure is written in the view controller, so self is the view controller. This means no need to create a second (useless) controller inside the fetch.
I would like to call a function which is coded on another class.
So far I have made a struct on the file structs.swift for my data:
struct defValues {
let defCityName: String
let loadImages: Bool
init(defCity: String, loadImgs: Bool){
self.defCityName = defCity
self.loadImages = loadImgs
}
}
I have made the file Defaults.swift containing:
import Foundation
class DefaultsSet {
let cityKey: String = "default_city"
let loadKey: String = "load_imgs"
func read() -> defValues {
let defaults = NSUserDefaults.standardUserDefaults()
if let name = defaults.stringForKey(cityKey){
print(name)
let valuesToReturn = defValues(defCity: name, loadImgs: true)
return valuesToReturn
}
else {
let valuesToReturn = defValues(defCity: "No default city set", loadImgs: true)
return valuesToReturn
}
}
func write(city: String, load: Bool){
let def = NSUserDefaults.standardUserDefaults()
def.setObject(city, forKey: cityKey)
def.setBool(load, forKey: loadKey)
}
}
in which I have the two functions read, write to read and write data with NSUsersDefault respectively.
On my main ViewController I can read data with:
let loadeddata: defValues = DefaultsSet().read()
if loadeddata.defCityName == "No default city set" {
defaultCity = "London"
}
else {
defaultCity = loadeddata.defCityName
defaultLoad = loadeddata.loadImages
}
But when I try to write data it gives me error. I use this code:
#IBOutlet var settingsTable: UITableView!
#IBOutlet var defaultCityName: UITextField!
#IBOutlet var loadImgs: UISwitch!
var switchState: Bool = true
#IBAction func switchChanged(sender: UISwitch) {
if sender.on{
switchState = true
print(switchState)
}else {
switchState = false
print(switchState)
}
}
#IBAction func saveSettings(sender: UIButton) {
DefaultsSet.write(defaultCityName.text, switchState)
}
You need an instance of the DefaultsSet class
In the view controller add this line on the class level
var setOfDefaults = DefaultsSet()
Then read
let loadeddata = setOfDefaults.read()
and write
setOfDefaults.write(defaultCityName.text, switchState)
The variable name setOfDefaults is on purpose to see the difference.
Or make the functions class functions and the variables static variables and call the functions on the class (without parentheses)
From the code you posted, it seems you either need to make the write method a class method (just prefix it with class) or you need to call it on an instance of DefaultsSet: DefaultsSet().write(defaultCityName.text, switchState).
Another issue I found is that you also need to unwrapp the value of the textField. Your write method takes as parameters a String and a Bool, but the value of defaultCityName.text is an optional, so String?. This results in a compiler error.
You can try something like this:
#IBAction func saveSettings(sender: UIButton) {
guard let text = defaultCityName.text else {
// the text is empty - nothing to save
return
}
DefaultsSet.write(text, switchState)
}
This code should now compile and let you call your method.
Let me know if it helped you solve the problem
I have the following code written in SWIFT for OS X App, the code is working fine (NSComboBox are select able only, not editable)
I have these two IBOutlet projNewProjType and projNewRouter, when I change the the selection of either of the NSComboBox, I can see the correct selected Index value and String value but how to check that the returned Index value is from projNewProjType NOT projNewRouter in the comboBoxSelectionDidChange()
import Cocoa
class NewProjectSetup: NSViewController, NSComboBoxDelegate {
let comboxProjValue: [String] = [“No”,”Yes”]
let comboxRouterValue: [String] = ["No","Yes"]
#IBOutlet weak var projNewProjType: NSComboBox!
#IBOutlet weak var projNewRouter: NSComboBox!
#IBAction func btnAddNewProject(sender: AnyObject) {
print(“Add New Button Pressed!”)
}
#IBAction func btnCancel(sender: AnyObject) {
self.dismissViewController(self)
}
override func viewDidLoad() {
super.viewDidLoad()
addComboxValue(comboxProjValue,projNewProjType)
addComboxValue(comboxRouterValue,projNewRouter)
self.projNewProjType.selectItemAtIndex(0)
self.projNewRouter.selectItemAtIndex(0)
self.projNewProjType.delegate = self
self.projNewRouter.delegate = self
}
func comboBoxSelectionDidChange(notification: NSNotification) {
let comboBox: NSComboBox = (notification.object as? NSComboBox)!
print("comboBox comboBox: \(comboBox)")
/* This printed “<NSComboBox: 0x6000001e1a00>”*/
print("comboBox objectValueOfSelectedItem: \(comboBox.objectValueOfSelectedItem)")
/* This printed the correct selected String value */
print("comboBox indexOfSelectedItem: \(comboBox.indexOfSelectedItem)")
/* This printed the correct selected Index value */
}
/* Add value to Combo box */
func addComboxValue(myVal:[String],myObj:AnyObject){
let myValno: Int = myVal.count
for i in 0..<myValno{
myObj.addItemWithObjectValue(myVal[i])
}
}
}
You already know the addresses of your two NSComboBox outlets and you know the address of which NSComboBox caused that notification to trigger, so why not do something like:
func comboBoxSelectionDidChange(notification: NSNotification) {
let comboBox: NSComboBox = (notification.object as? NSComboBox)!
if comboBox == self.projNewProjType
{
print("selection changed via self.projNewProjType")
}
if comboBox == self.projNewRouter
{
print("selection changed via self.projNewRouter")
}
You can set identifiers to your NSComboBoxes in IB. Select your combo box and choose identity inspector and name identifier. Then you are able to do like this:
if comboBox.identifier == "someIdentifier" {
// Do something
}