I'm new to iOS development. There are many duplicated questions (Sorry). But I could not solve this problem.
prepareForSegue is not called after calling performSegueWithIdentifier.
The show segue identifier is named as 'segue1'.
Ctrl-Dragged from ViewController to DetailViewController.
Am I missing something?
ViewController.swift:
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
#IBAction func buttonTapped(sender: AnyObject) {
print("ViewController - buttonTapped()")
performSegueWithIdentifier("segue1", sender: self)
}
override func performSegueWithIdentifier(identifier: String, sender: AnyObject?) {
print("ViewController - performSegueWithIdentifier(): \(identifier)")
}
override func shouldPerformSegueWithIdentifier(identifier: String, sender: AnyObject?) -> Bool {
print("ViewController - shouldPerformSegueWithIdentifier()")
return true
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
print("ViewController - prepareForSegue(): \(segue.identifier!)")
}
}
DetailViewController.swift:
class DetailViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
print("DetailViewController - viewDidLoad()")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
Here is a screenshot of storyboard.
Output (after the button is tapped)
ViewController - buttonTapped()
ViewController - performSegueWithIdentifier(): segue1
You're not calling super - add the following to send the message to the parent class (which will in turn fire off the segue)
super.performSegueWithIdentifier(identifier, sender: sender)
Related
I'm new to swift development. I'm trying to pass data from one UiViewController to Another UIViewController with NavigationController. I was able to pass the data, but for some reason, it loads the viewDidLoad() twice on the second UIViewController. Below is my code.
ViewController
class ViewController: UIViewController {
var option = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// Dine In Btn
#IBAction func dineinBtn(_ sender: Any) {
self.option = "Dine In"
performSegue(withIdentifier: "dinein", sender: self)
}
// Take Out Btn
#IBAction func takeoutBtn(_ sender: Any) {
self.option = "Take Out"
performSegue(withIdentifier: "takeout", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let vc = segue.destination as! QualityViewController
vc.option = self.option
}
#IBAction func unwindToVC1(segue:UIStoryboardSegue) { }
}
QualityViewController
class QualityViewController: UIViewController {
var option = ""
override func viewDidLoad() {
super.viewDidLoad()
option += option
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
}
The reason may be that you hook buttons dineinBtn and takeoutBtn as the segue source , so the IB segue is triggered plus this
performSegue(withIdentifier: "takeout", sender: self)
Another reason may be that you copied the buttons in IB so each one is hooked to 2 IBActions in code
I want to have the pretty simple transition from the home view where the user enters the text in the textfield, then have its segue go to the next view controller. I did implement the function textFieldShouldReturn(textField: UITextField) -> Bool which tries to perform the segue, but didn't get the desired result.
Here's the part of the code
class LogInVC: UIViewController {
#IBOutlet weak var logInLabel: UILabel!
#IBOutlet weak var logInField: UITextField!
override func viewDidLoad() {
NSLog("LogIn view loaded, setting delegate")
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func viewDidAppear(_ animated: Bool) {
NSLog("viewWillAppear: Performing possible queued updates")
textFieldShouldReturn(textField: logInField)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let autoCheckInVC = segue.destination as?
AutocheckInVC else {
preconditionFailure("Wrong destination type: \(segue.destination)")
}
guard logInField.text != nil else {
preconditionFailure("Text property should not be nil")
}
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
self.performSegue(withIdentifier: "AutoCheckInVC", sender: self)
return true
}
}
Any quick help for debugging this would be so greatly appreciated. I have tried quite much time fixing this, but I haven't found the way out!!!
You have a few errors in your code:
To be able to call textFieldShouldReturn you need to inherit from UITextFieldDelegate and set the delegate of your textField, logInField.delegate = self
Don´t call textFieldShouldReturn from viewDidAppear
Use the latest syntax for the method textFieldShouldReturn
You got the warning result of call to this method is unused because it was never called since you never had the delegates
Try this code instead of yours:
class LogInVC: UIViewController, UITextFieldDelegate {
#IBOutlet weak var logInLabel: UILabel!
#IBOutlet weak var logInField: UITextField!
override func viewDidLoad() {
NSLog("LogIn view loaded, setting delegate")
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
logInField.delegate = self
}
override func viewDidAppear(_ animated: Bool) {
NSLog("viewWillAppear: Performing possible queued updates")
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
guard let autoCheckInVC = segue.destination as?
ViewController else {
preconditionFailure("Wrong destination type: \(segue.destination)")
}
guard logInField.text != nil else {
preconditionFailure("Text property should not be nil")
}
}
func textFieldShouldReturn(_ textField: UITextField) -> Bool {
self.performSegue(withIdentifier: "AutoCheckInVC", sender: self)
return true
}
}
This is my code of two viewcontroller, need pass "numberToDisplay" from class bookTwo to class bookThree, but it not work, always show 0 in bookThree.
I am using swift3 on ios 10, xocod 8.
bookTwo:
import UIKit
import Foundation
class bookTwo: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == "ms1"{
let destinationVC = segue.destination as? bookThree;
destinationVC?.numberToDisplay = 7
}
}
}
bookThree
import UIKit
class bookThree: UIViewController {
var numberToDisplay = 0
#IBOutlet weak var showType: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
showType.text = "Tapped \(numberToDisplay) times."
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
In Swift 3, the signature for method "prepareForSegue" has changed. So replace the code for "prepareForSegue" with this:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "ms1"{
let destinationVC = segue.destination as? bookThree
destinationVC?.numberToDisplay = 7
}
}
I have the following:
class Settings: UIViewController {
#IBAction func CitySend(sender: AnyObject) {
self.performSegue(withIdentifier: "senddata", sender: self)
}
#IBOutlet weak var textField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "senddata" {
let Mainview = segue.destination as! ViewController
Mainview.label = textField.text!
}
}
}
My mainview looks like this:
class ViewController: UIViewController {
#IBOutlet var city: UILabel!
var label: String = ""
override func viewDidLoad() {
super.viewDidLoad()
city.text = label
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
im not sure, if this is how i should even do this, but to me the logic is that i only want to allow this segue to pass a string to my label in my mainview if the button is pressed (Like a save button)
However as to what i have made now, nothing happens, and it gives me the 1: signal SIGABRT error, whenever i press the button.
Use the following code:
ViewController.swift
import UIKit
class ViewController: UIViewController, SecondViewControllerProtocol{
#IBOutlet weak var dataLabel: UILabel!
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.
}
#IBAction func navigateToSecondViewControllerOnButtonClick(_ sender: AnyObject) {
let secondVC: ViewController2 = storyboard?.instantiateViewController(withIdentifier: "viewcont2") as! ViewController2
secondVC.delegate = self
self.navigationController?.pushViewController(secondVC, animated: true)
}
func saveData(data: String){
dataLabel.text = data
}
}
ViewController2.swift
import UIKit
protocol SecondViewControllerProtocol {
func saveData(data: String) // this function the first controllers
}
class ViewController2: UIViewController {
var delegate: SecondViewControllerProtocol?
#IBOutlet weak var dataTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func saveButtonClicked(_ sender: AnyObject) {
delegate?.saveData(data: dataTextField.text!)
}
}
Storyboard screenshot:
Please check my GitHub link below to test sample:
https://github.com/k-sathireddy/PassingDataThroughSegue
#IBAction func CitySend(sender: AnyObject) {
self.performSegue(withIdentifier: "senddata", sender: textField.text)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
switch (segue.identifier, segue.destination, sender) {
case (.Some("senddata"), let controller as ViewController, let text as String):
controller.label = text
default:
break
}
}
I have a problem that the self.performSegueWithIdentifier("contact_segue", sender: self) do not work and complain that Receiver has no segue with identifier 'contact_segue' even i have the identifier. I have used the SWReveal framework to build the left-side sliding menu which is work with table view(class: slidingMenuController). After I clicked the cell to call function changeView of MainNavigationController to do changing views.
import UIKit
class MainNavigationController: UINavigationController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func viewDidAppear(animated: Bool){
super.viewDidAppear(false)
self.performSegueWithIdentifier("Home", sender: self)
}
override func prepareForSegue(segue: UIStoryboardSegue!, sender: AnyObject!) {
if segue.identifier == "Contact_se" {
}
}
func changeView(){
self.performSegueWithIdentifier("contact_segue", sender: self)
}
}
The changeView which is called by an a left-side sliding menu (class: slidingMenuController) in a tablecell:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let selectedItemMenu = arrayOfSlider[indexPath.row]
let mainNav = MainNavigationController()
mainNav.changeView()
}
Just add this code self.performSegueWithIdentifier("contact_segue", sender: self) on your didSelectRowAtIndexPath? I believe there's no need for the MainNavigationController here.