Okay, so I have two storyboards being incorporated into my code. One of them being the coffeeViewController, the other being the checkoutViewController. I have an array of doubles and different values incorporated into it. However, when I run the code, it shows the label that I want to edit as blank. Can someone tell me how to fix this?
This code is on my coffeeViewController
var total:[Double] = []
#IBAction func action(_ sender: Any) {
func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let sum = total.reduce(0,+)
let number = "\(sum)"
let lvc = segue.destination as! checkoutViewController
lvc.am = number
}
}
This code is on my checkoutViewController
var am = String()
override func viewDidLoad()
{
super.viewDidLoad()
amount.text = am
}
Related
In a single button, i put both alart system and a pop up view. If the text fields are blank then it will send an alart. If everything is okay then it will show popup view. Alart system and pop up is conflicting. How do I set conditon to segue function when to perform or not?
The function is not written proper. I can understand. But I am confused writing it. How do i call the overrride func?
func stateCondition(state: Bool) {
if state {
print("Entered into the state") //entering into the func
func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "info"{
_ = segue.destination as! InfoViewController
}
if segue.identifier == "popUp" {
let vc = segue.destination as! PopUpViewController
vc.age = Double(ageTextField.text!)!
vc.gender = genderTextField.text!
vc.bmi = Double(bmiLabel.text!)!
print("Entered into the segue") //is not entering into this func
}
}
}
}
Try to read the code and comments.
First of all, the method func prepare(for segue: UIStoryboardSegue, sender: Any?) must not be in another method. Somehow you managed to squeeze it in func stateCondition(state: Bool) . Second you are not calling performSegue(withIdentifier: identifier, sender: self) anywhere. You probably should :) Check out the code, hope it helps. I remember my first segue, it took me some time to understand what is going on.
class ViewController: UIViewController {
#IBOutlet private var ageTextField: UITextField!
#IBOutlet private var genderTextField: UITextField!
#IBOutlet private var bmiLabel: UILabel!
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// 3
// This method gets called and there you do your stuff with respective VCs
if segue.identifier == "info", let infoViewController = segue.destination as? InfoViewController {
// 3.1
// If the identifer is set to INFO then you go to the InfoViewController and assigne message
infoViewController.message = "Some fields are empty"
} else if segue.identifier == "popUp", let popUpViewController = segue.destination as? PopUpViewController {
// 3.2
// If the identifer is set to POPUP then you go to PopUpViewController and assign age, gender and bmi
popUpViewController.age = "33"
popUpViewController.gender = "male"
popUpViewController.bmi = "20"
} else {
print("Identifer is none of the above")
}
}
#IBAction private func buttonTapped(_ sender: Any) {
// 1.
// First you need to figure out where you want to take the user
// You do that in the method getSegueIdentifier() where you get the identifier
let identifier = getSegueIdentifier()
// 2.
// Then you performSegue with that identifer
performSegue(withIdentifier: identifier, sender: self)
}
private func getSegueIdentifier() -> String {
if ageTextField.text?.isEmpty == true && genderTextField.text?.isEmpty == true && bmiLabel.text?.isEmpty == true {
return "info"
} else {
return "popUp"
}
}
}
class InfoViewController: UIViewController {
var message = ""
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
showAlert()
}
func showAlert() {
// show alert with message
print(message)
}
}
class PopUpViewController: UIViewController {
var age = ""
var gender = ""
var bmi = ""
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
showPopUp()
}
func showPopUp() {
// show popUp with age gender and bmi
print(age, gender, bmi)
}
}
There is general misunderstanding: You must not call prepare(for segue – besides the syntax is wrong anyway – the function is called by the framework just before the segue is performed.
You probably mean something like
func stateCondition(state: Bool) {
if state {
print("Entered into the state") //entering into the func
performSegue(withIdentifier: "info", sender: nil)
} else {
performSegue(withIdentifier: "popUp", sender: nil)
}
}
func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "popUp" {
let vc = segue.destination as! PopUpViewController
vc.age = Double(ageTextField.text!)!
vc.gender = genderTextField.text!
vc.bmi = Double(bmiLabel.text!)!
print("Entered into the segue") //is not entering into this func
}
}
I have two viewcontrollers setup and set the segue connections as well. I'm attempting to pass data from one of the VC's to the other. Using the below code and using the func override works. What i want to do is only have the override func prepare fire off when a button is pressed and when i paste the override func code into a button action, it doesnt work - the label on the first VC doesnt update - it stays to the default value i set.
First ViewController code:
var testLabel1:String = "default"
#IBOutlet weak var testLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
testLabel?.text = testLabel1
// Do any additional setup after loading the view.
}
Second ViewController code:
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.destination is ViewController
{
let vc = segue.destination as? ViewController
vc?.testLabel1 = "Success"
}
}
Button action that ive tried
#IBAction func actionBtn(_ sender: Any) {
func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.destination is ViewController
{
let vc = segue.destination as? ViewController
vc?.testLabel1 = "Success"
}
}
}
You need to trigger it with performSegue
class FirstVc:UIViewController {
#IBOutlet weak var lbl:UILabel!
#IBAction func goToSecond(_ sender: Any) {
self.performSegue(withIdentifier:"YourSegueName",sender:nil)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "YourSegueName" {
let vc = segue.destination as! SecondVC
vc.testLabel1 = "Success"
}
}
func setData(_ str:String){
self.lbl.text = str
}
}
class SecondVC:UIViewController {
var testLabel1 = ""
weak var delegate:FirstVc?
func goBack() {
self.delegate?.setData("FromSecond")
self.dismiss(animated: true, completion: nil)
}
}
I am trying to send an image to the preview controller as shown below. My issue is that in the preview controller newImage is nil
Below is the code:
FirstViewController
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print("In here")
if segue.identifier == "showImage" {
let secondViewController = self.storyboard!.instantiateViewController(withIdentifier: "showImage") as! showImageController
secondViewController.newImage = UIImage(named: imageArray[0])
}
}
PreviewController
#IBOutlet weak var imageHolder: UIImageView!
var newImage: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
imageHolder.image = newImage
// Do any additional setup after loading the view.
}
You should use segue.destination not create a new one , like this
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
print("In here")
if segue.identifier == "showImage" {
let next = segue.destination as! showImageController
next.newImage = UIImage(named: imageArray[0])
}
}
instantiateViewController calls viewDidLoad() so you will not have setup your image when it gets called. Move the code to viewWillAppear() and it will work
I'm trying to send multiple variables in one single sender to show it in the Viewcontroller that it's connected to a segue named menuENG. I have five buttons and each button should send different information because is a dictionary and each button is a word. But I want to do this thru one sender. I tried the following code to make it but it is not working.
p.s.: I tried making an array but Xcode goes crazy.
#IBAction func abstractionENG(sender:UIButton) {
return perfomanceWithIdentifier("menuENG",sender:nil)
}
I think you can send the dictionary and there is something wrong with this line return perfomanceWithIdentifier("menuENG",sender:nil)
Anyway you can seperatly identify which button is clicked by tag and create dictionary on base of clicked button now you can send the complete dictionary to the sender.
#IBAction func abstractionENG(sender:UIButton) {
var dictSendData:[String:Any] = [:]
if sender == btn1
{
dictSendData.updateValue("abc", forKey: "key1")
dictSendData.updateValue("pqr", forKey: "key2")
}
else if sender == btn2
{
dictSendData.updateValue("xyz", forKey: "key1")
dictSendData.updateValue("123", forKey: "key2")
}
else
{
dictSendData.updateValue("123", forKey: "key1")
dictSendData.updateValue("abc", forKey: "key2")
}
self.performSegue(withIdentifier:"menuENG", sender: dictSendData)
}
1- assign segue action to IBAction function - assign tag id to ever button
you have already implemented it .
2- your IBAction function should run another function to run performSegue function
example :
self.performSegue(withIdentifier: "openAnotherViewController",sender: sender)
3- go to destination view Controller and create reciver variables "Maybe you can use optionals " .
var receiverInt :Int = 0
var receiverInt2 :Int = 0
3- go to the source view Controller and pass variables
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected variable/object to the new view controller .
if segue.identifier == "openAnotherViewController" {
let destinationController = segue.destination as! OtherViewControllerClass Name
// identify button by tag number
if (sender as! UIButton).tag == 200 {
destinationController.receiverInt = self.sourceInt
}else{
destinationController.receiverInt2 = self.sourceInt2}
}
}
Thank you everyone for the help fixed the issue by this way >
class MainViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
/* The following functions containts a group of conditionals which will change the scene depending of the IBAction selected */
#IBAction func abstractionENG(sender: UIButton) {
let data = [DiccioModel.abstraction().nameEng,DiccioModel.abstraction().descriptionEng,DiccioModel.abstraction().linkEng]
performSegueWithIdentifier("menuENG", sender: data)
}
#IBAction func webBrowserENG(sender: UIButton) {
let data = [DiccioModel.webBrowser().nameEng,DiccioModel.webBrowser().descriptionEng,DiccioModel.webBrowser().linkEng]
performSegueWithIdentifier("menuENG", sender: data)
}
#IBAction func latencyENG(sender: UIButton) {
let data = [DiccioModel.latency().nameEng,DiccioModel.latency().descriptionEng,DiccioModel.latency().linkEng]
performSegueWithIdentifier("menuENG", sender: data)
}
#IBAction func conditionalENG(sender: UIButton) {
let data = [DiccioModel.conditional().nameEng,DiccioModel.conditional().descriptionEng,DiccioModel.conditional().linkEng]
performSegueWithIdentifier("menuENG", sender: data)
}
#IBAction func operatingSystemENG(sender: UIButton) {
let data = [DiccioModel.os().nameEng,DiccioModel.os().descriptionEng,DiccioModel.os().linkEng]
performSegueWithIdentifier("menuENG", sender: data)
}
#IBAction func abstractionESP(sender: UIButton) {
let data = [DiccioModel.abstraction().nameEsp,DiccioModel.abstraction().descriptionEsp,DiccioModel.abstraction().linkEsp]
performSegueWithIdentifier("menuESP", sender: data)
}
#IBAction func webBrowserESP(sender: UIButton) {
let data = [DiccioModel.webBrowser().nameEsp,DiccioModel.webBrowser().descriptionEsp,DiccioModel.webBrowser().linkEsp]
performSegueWithIdentifier("menuESP", sender: data)
}
#IBAction func latencyESP(sender: UIButton) {
let data = [DiccioModel.latency().nameEsp,DiccioModel.latency().descriptionEsp,DiccioModel.latency().linkEsp]
performSegueWithIdentifier("menuESP", sender: data)
}
#IBAction func conditionalESP(sender: UIButton) {
let data = [DiccioModel.conditional().nameEsp,DiccioModel.conditional().descriptionEsp,DiccioModel.conditional().linkEsp]
performSegueWithIdentifier("menuESP", sender: data)
}
#IBAction func operatingSystemESP(sender: UIButton) {
let data = [DiccioModel.os().nameEsp,DiccioModel.os().descriptionEsp,DiccioModel.os().linkEsp]
performSegueWithIdentifier("menuESP", sender: data)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if(segue.identifier == "menuENG") || (segue.identifier == "menuESP"){
if let destinationViewController = segue.destinationViewController as? DefinitionViewController{
if let data = sender as? Array<String>{
destinationViewController.tittle = data[0]
destinationViewController.def = data[1]
destinationViewController.link = data[2]
}
}
}
}
PS: note this code is connected to the DefinitionViewController ( Controller of the view) and to a model. ( project was made by M.V.C way).
Again Thx everyone for your help. hope the code help other people in the future.
New to swift, hope I will get my answer. I need to pass NSArray to next view controller and in random order when button is pressed. I have UILabel and one variable declared in second view controller and segue seems working. Only peoblem is it does not pass any value. Here is my code.
#IBAction func ressedbutton(_ sender: Any) {
let quotes: NSArray = ["Quote 000", "Quote 001", "Quote 002"]
let range: UInt32 = UInt32(quotes.count)
let randomNumber = Int(arc4random_uniform(range))
let QuoteString = quotes.object(at: randomNumber)
// self.resul.text = QuoteString as? String
performSegue(withIdentifier: "showresult", sender: QuoteString)
let myVC = storyboard?.instantiateViewController(withIdentifier: "result") as! result
myVC.stringPassed =
(QuoteString as? String)!
}
and code for second view is
class result: UIViewController {
var stringPassed = ""
#IBOutlet weak var ResultLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
ResultLabel.text = stringPassed
I think my problem is in myvc.stringpassed=...? How to pass the arry I have and in randomly?
Thanks in Advance.
What you need to do is pass that value with sender in performSegue and after that access that value in prepare(for:sender:) and pass the value to destinationController.
performSegue(withIdentifier: "showresult", sender: QuoteString)
Now use this sender argument in prepare(for:sender:)
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let vc = segue.destination as? result, let data = sender as? String {
vc.stringPassed = data
}
}
You have to use prepare(for segue: UIStoryboardSegue, sender: Any?) method to assign data to toViewController.UIStoryboardSegue object segue have properties like identifier ,destination and source.
In this method first you check the identifier,if it matches cast the destination controller to your custom view controller and assign the data to the view controller object.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showresult"{
if let toViewController = segue.destination as? result {
vc.stringPassed = QuoteString
}
}
}
try this way remove segue give Storyboard ID to your view controller where u want to pass data and paste that same Storyboard Id below (YourIdentifier)
#IBAction func ressedbutton(_ sender: Any) {
let quotes: NSArray = ["Quote 000", "Quote 001", "Quote 002"]
let range: UInt32 = UInt32(quotes.count)
let randomNumber = Int(arc4random_uniform(range))
let QuoteString = quotes.object(at: randomNumber)
// self.resul.text = QuoteString as? String
let vc = storyboard?.instantiateViewController(withIdentifier:"YourIdentifier") as! YourNextViewController
vc.stringPassed = (QuoteString as? String)!
self.present(vc, animated: true, completion: nil)
}