I am struggling for some hours at a problem. Basically, I have a simple Swift app. It goes like this. In my 1st view controller I have 3 text fields I want to fill them with information and a "Next" button.
Pressing the "Next" button will send me to a new UIViewController where I will have a "Back" button. Upon pressing the back button, I will be send back to 1st page with the 3 text fields.
What I want is: if I complete the text fields with informations, press Next and then Back, I want the text fields to be filled with that information.
I managed to move between the views with buttons, but I can't save the information. Can you provide me a little help?
#IBOutlet weak var txtb1: UITextField!
#IBOutlet weak var txtb2: UITextField!
#IBOutlet weak var txtb3: UITextField!
#IBAction func next(sender: AnyObject) {
text1 = self.txtb1.text!
text2 = self.txtb2.text!
text3 = self.txtb3.text! }
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if (!text1)
{
txtb1.text = text1
}
}
If you are wanting to pass variables to different views you will have to use the prepareForSegue function before you segue into that view controller.
This allows the variables to be accessed by the view controller.
Override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject!)
{
if segue.identifier == "segue_name"
{
let theDestination = segue.destinationViewController as! newViewController
theDestination.variable = "testing"
theDestination.variable2 = "testing2"
}
}
Then inside your second view controller you will have to declare variable and variable2 as shown:
var variable:String!
var variable2:String!
These will then be able to be used in the second view controller inside the viewDidLoad method.
Ok. I managed to fix a little of the problem, that button wasn't linked accordingly so the function was not executing. Here it is the code:
var text1 = ""
#IBOutlet weak var txtb1: UITextField!
#IBAction func next(sender: AnyObject) {
text1 = self.txtb1.text! // text1 = "I am taking value"
}
// when i press the back button
override func viewDidLoad() {
super.viewDidLoad()
if (!numarInmatriculare.isEmpty)
{
txtb1.text = text1 //here text1 = Null. the value is not saved
}
}
I want the value to be saved and displayed back on text field.
I also tried to use static varibiles but I am prompet with error.
static var numar:String = ""
numar = text1
//static member 'numar'cannot be used on instance of type 'viewcontroller'
You no need to do anything for this case, once text field filed then you clicking next button you wrote some code below i shown
text1 = self.txtb1.text!
text2 = self.txtb2.text!
text3 = self.txtb3.text!
Please first you remove the code,Once data filled in text filed, its automatically retain, after you clicking next button then come back it automatically it will retain, when your current view is poping then only your data will deallocate.
Related
I'm a beginner in swift, I'm making an app in storyboard UIKit, and I need some help basically I need to set up a view controller that has buttons on it that when clicked add a string on the bottom of the VC, and if clicked again it will remove that same string. On the VC there going to be multiple buttons like this for options also on the bottom of the VC I need the label to update during the app also it should display like this for example. "Football","Basketball","Golf". It needs to be displayed just like that on the bottom with quotes and commas. I've to turn to make action buttons with a global array and put that inside each button but I can't figure out how to remove it when the button clicked again, also if you click the button again it'll add the same thing again so in the array you'll have two of the same strings. Anything would help.
P.S I need to do this in UIkit and Storyboard
You can make list of outlets to an array UIButton, handle list of actions when click into UIButton with a function. Using 'isSelected' property of UIButton to distinguish 'delete' or not.
class ViewController: UIViewController {
#IBOutlet weak var descriptionLabel: UILabel!
#IBOutlet var allButtons: [UIButton]!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func didTapButton(_ sender: UIButton) {
sender.isSelected.toggle()
_updateDescription()
}
private
func _updateDescription() {
descriptionLabel.text = allButtons
.filter { $0.isSelected }
.compactMap { $0.titleLabel?.text }
.map { "\"\($0)\"" }
.joined(separator: ", ")
}
}
im developing an app that utilises many buttons( possibly 20 buttons) on one primary view controller that can are all able to activate a singular picker view within a pop up on a seperate view controller. i don’t think the answer is lots and lots segues. Is there a better approach I should be considering?
I’m thinking - some kind of multiuse segue that can be activated by any of the buttons, but nonidea how this is done.
Appreciate any advice
Mike
Set up all buttons to same action such as:
#IBAction func keyPressed(_ sender:UIButton){
// use button title string
self.keyString = sender.titleLabel?.text as! String
// or tag
self.keyTag= sender.tag?
self.performSegue(withIdentifier: "TheSegue", sender: self)
}
Then you would want to set up the View Controller that you are going to navigate to based on the state of the sender. So you would override the prepare:forSegue method as below.
override func prepare(for segue:UIStoryboardSegue, sender:Any?) {
let destController = segue.destination as! Dest_Controller_Class
// use tag or keyTitle to set controller attributes
// before view is shown
destController.keyTag = self.keyTag
destController.keyString = self.keyString
}
Now once you've navigated to the Dest_Controller_Class, you will have the properties of the button pressed locally in the view controller and could update the view as you see fit:
class Dest_Controller_Class: UIViewController {
var keyString: String?
var keyTag: Int?
#IBOutlet weak var label: UILabel!
override func viewDidLoad() {
if (keyString != nil) {
label.text = keyString;
// or likewise use tag
} else {
label.text = "keyString not set"
}
}
}
Im currently developing a iOS app in which im going to keep track of our warehouse stock. It's a pretty simple app an just contains a lable and an stepper. The app is pretty much finished, but i don't get how to save the changed value of the label. I want to save it automatically so that when someone presses the "+" on the stepper, the value should save without pressing a extra save button
Current code:
//montageplatte
#IBOutlet weak var lbl_montageplatte: UILabel!
#IBAction func stepper_montageplatte(_ sender: UIStepper)
{
lbl_montageplatte.text = Int(sender.value).description
}
you can save it in UserDefaults.
#IBAction func stepper_montageplatte(_ sender: UIStepper) {
lbl_montageplatte.text = Int(sender.value).description
UserDefaults.standard.set(String(sender.value), forKey: "lblMontageplatte")
}
To get back value you can do as follow...
if let lblValue = UserDefaults.standard.object(forKey: "lblMontageplatte") as? String {
print(lblValue)
lbl_montageplatte.text = lblValue
}
Simple solution:
In the custom cell create an outlet for the stepper and a NSKeyValueObservation property
#IBOutlet weak var stepper : UIStepper!
var stepperObservation : NSKeyValueObservation?
In cellForRow in the controller add the key value observer
cell.stepperObservation = cell.stepper.observe(\.value, options: [.new]) { (stepper, change) in
print(change.newValue!)
}
Rather than printing the new value update the model (the item for the particular index path) and save the datasource array if necessary.
I'm currently reading the book, Beginning iPhone Development with Swift and having some trouble in the third chapter's exercise. It basically has you created two buttons (both linked to the same action) and a label that has its text change depending on which button you press. I've followed the example code exactly but still get the error NSString' is not a subtype of 'UILAbel over my last line within the function. All three UI elements are linked as they should but don't know what its not working.
class ViewController: UIViewController {
#IBOutlet weak var statusLabel: UILabel!
#IBAction func buttonPressed(sender: UIButton) {
let title = sender.titleForState(.Normal)!
let plainText = "\(title) button pressed"
statusLabel = plainText
}
}
That's because you cannot assign an NSString to a UILabel.
statusLabel = plainText // invalid
What you can do:
statusLabel.text = plainText
I have a tab bar controller as the starting point of my app, where one of the tab and what happens subsequently is meant for admins only. So I was password protecting a tab. I thought of adding a little modal dialogue in the viewDidLoad function of my view controller (which by the way is a UITableViewController),
Suppose I can get the text that the user entered in the dialogue box in the variable inputTextField.
The relevant section of the code from viewDidLoad():
if inputTextField?.text != "secret" {
return
}
super.viewDidLoad()
But it does not work. Any hint appreciated. Sorry if it is too basic, I am completely new to iOS and Swift programming, so pardon my ignorance folks.
Here is a simple example. Lots of ways. I dropped two UIViews in Storyboard on the first tab's VC. The one in the back I gave a dark color to simulate the hidden secret view (secretView). Inside of the view on top (entryView) I dragged a label "Enter Passcode" and a text field (passCode). I just hid the back view unless the secret code was correct.
import UIKit
class FirstViewController: UIViewController, UITextFieldDelegate {
override func viewDidLoad() {
super.viewDidLoad()
self.passCode.delegate = self
entryView.hidden = false
secretView.hidden = true
}
#IBOutlet weak var entryView: UIView!
#IBOutlet weak var secretView: UIView!
let secretCode = "X"
#IBOutlet weak var passCode: UITextField!
func textFieldShouldReturn(textField: UITextField!) -> Bool {
if textField.text == secretCode {
entryView.hidden = true
secretView.hidden = false
} else {
self.passCode.text = "Try Again!"
}
textField.resignFirstResponder()
return true
}
}