I am endeavouring to master segues and have created to simple view controllers, the first being a simple TableViewController using the following class
import UIKit
class CourseTVC: UITableViewController {
var courseVenue = ["Cardiff", "Swansea", "Rhyl", "Bangor"]
var courseDate = ["27th February 2017", "9th March 2017", "17th March 2017", "23rd March 2017"]
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return courseVenue.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "courseCell", for: indexPath)
cell.textLabel?.text = courseVenue[indexPath.row]
cell.detailTextLabel?.text = courseDate[indexPath.row]
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showMapDeail" {
let destinationController = segue.destination as! CourseMapVC
if let indexPath = tableView.indexPathForSelectedRow {
destinationController.courseTitle = courseVenue[indexPath.row]
}
}
}
}
I am using simple script arrays to populate the cell data. This works well and I want to pass the selected row title to a second ViewController and simply display the venue title. The second view controller opens up (the segue is named showMapDetail on the storyboard and is a show segue) but displays no venue title. The class for the second view controller is thus
import UIKit
class CourseMapVC: UIViewController {
#IBOutlet weak var venueTitle: UILabel!
var courseTitle: String = ""
override func viewDidLoad() {
super.viewDidLoad()
venueTitle.text = courseTitle
}
}
There are no errors and no data passed or nil value passed. There seems to be clue that i can interrogate further, so any pointers greatly received.
thanks.
Sorry Guys, as soon as I posted this I noticed a typo in the segue identifier.
Thanks anyways.
Related
I am trying to create a simple app which lets appending data into an array in first ViewController and then send it to the SecondViewController through the segue. However instead of appending new data it is updating first index of an array.
import UIKit
class ViewController: UIViewController {
var data = [String]()
#IBOutlet weak var textField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
#IBAction func sendButton(_ sender: Any) {
if textField.text != nil {
let activity = textField.text
data.append(activity!) //Data should be appended here.
performSegue(withIdentifier: "sendSegue", sender: self)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "sendSegue" {
let destVC: AppTableViewController = segue.destination as! AppTableViewController
destVC.newData = data
}
}
}
Here is my SecondTableViewController and it just update first index so I am just keep changing my first index instead of adding new values into it.
import UIKit
class AppTableViewController: UITableViewController {
var newData = [String]()
#IBOutlet var myTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return newData.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = newData[indexPath.row]
return cell
}
}
Based on this link,
Please change the function name sendButton to btnSendButton.
So that it will run before prepare.
As of now sendButton is running after prepare. So the data is not appending.
I'm trying to segue from one UITableView to another UITableView. I want to segue and pass the myCell.textLabel?.text value of the selected cell to the second UITableView.
The code for my first UITableView (MenuTypeTableViewController and the code for my second UITableView (TypeItemsTableViewController) is also below.
I'm fully aware this involves the prepareForSegue function which currently I've not created, purely because I'm unsure where I override it and how to pass in the textLabel value to it.
Hope my question makes sense, I will update with suggestions and edits.
class MenuTypeTableViewController: UITableViewController, MenuTypeServerProtocol {
//Properties
var cellItems: NSArray = NSArray()
var menuType: MenuTypeModel = MenuTypeModel()
override func viewDidLoad() {
super.viewDidLoad()
let menuTypeServer = MenuTypeServer()
menuTypeServer.delegate = self
menuTypeServer.downloadItems()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return cellItems.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier: String = "cellType"
let myCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
let item: MenuTypeModel = cellItems[indexPath.row] as! MenuTypeModel
myCell.textLabel?.text = item.type
return myCell
}
func itemsDownloaded(items: NSArray) {
cellItems = items
tableView.reloadData()
}
}
class TypeItemsTableViewController: UITableViewController, TypeItemsServerProtocol {
//Properties
var cellItems: NSArray = NSArray()
var typeItemList: TypeItemsModel = TypeItemsModel()
override func viewDidLoad() {
super.viewDidLoad()
let typeItemsServer = TypeItemsServer()
typeItemsServer.delegate = self
typeItemsServer.downloadItems()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return cellItems.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cellIdentifier: String = "cellTypeItem"
let myCell: UITableViewCell = tableView.dequeueReusableCell(withIdentifier: cellIdentifier)!
let item: TypeItemsModel = cellItems[indexPath.row] as! TypeItemsModel
myCell.textLabel?.text = item.name
return myCell
}
func itemsDownloaded(items: NSArray) {
cellItems = items
tableView.reloadData()
}
}
Hi try the following set of code, I have added few additional changes in your code make use of it, I hope it will solve your issue.
I have added only the extra codes which you needed
class TypeItemsTableViewController: UITableViewController, TypeItemsServerProtocol {
// Add this variable in this class and use it whereever you needed it in this class
var selectedItem: String?
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// Get the selected cell
let selectedCell = tableView.cellForRow(at: indexPath)
// Now maintain the text which you want in this class variable
selectedItem = selectedCell?.textLabel?.text
// Now perform the segue operation
performSegue(withIdentifier: "TypeItemsTableViewController", sender: self)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "TypeItemsTableViewController" {
let destinationVC = segue.destination as? TypeItemsTableViewController
destinationVC?.selectedItem = self.selectedItem // Pass the selected item here which we have saved on didSelectRotAt indexPath delegate
}
}
In Second class:
class TypeItemsTableViewController: UITableViewController, TypeItemsServerProtocol {
// Add this variable in this class and use it whereever you needed it in this class
var selectedItem: String?
What you can do is to make a variable in your second UITableView
var String: labelSelected?
then in you prepare for segue method just set the labelSelected to the value of the cell.
refToTableViewCell.labelSelected = youCell.textlabel?.text
If you set up a segue in storyboards from one storyboard to another, you can use the code below in your prepareForSegue method. You'll need to add a testFromMenuTableViewController property to your TypeItemsTableViewController.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if let destination = segue.destination as? TypeItemsTableViewController,
let path = self.tableView.indexPathForSelectedRow,
let cell = self.tableView.cellForRow(at: path),
let text = cell.textLabel?.text {
destination.textFromMenuTypeTableViewController = text
}
}
For more info check this SO answer.
see this gif
when I choose the city Med , it passed to the TableVC not to the FirstVC (MainVC)
can I do that ? segue to the mainVC with the data passed through
the container (TableVC) ?
here what I did so far
MainVC
Empty
TableVC
import UIKit
class passedViewController: UITableViewController {
#IBOutlet weak var passcelltow: UITableViewCell!
#IBOutlet weak var passcell: UITableViewCell!
var passedCity1 = "اختر المدينة الاولى"
var passedCity2 = "اختر المدينة الثانية"
override func viewDidLoad() {
super .viewDidLoad()
passcell.textLabel?.text = passedCity1
passcelltow.textLabel?.text = passedCity2
}
}
Table 1 with data to pass to the TableVC
import UIKit
class city2ViewController: UIViewController , UITableViewDelegate , UITableViewDataSource{
#IBOutlet weak var tableView: UITableView!
var city2 = ["RUH" , "Med" , "Jed"]
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return city2.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell()
print(indexPath.row)
cell.textLabel?.text = city2[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "show", sender: city2[indexPath.row])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let passing = segue.destination as! passedViewController
passing.passedCity2 = sender as! String
}
}
Table 2 is the same ..
commend error
0 1 2 Could not cast value of type 'UIViewController' (0x107a10288) to
'table_view_test_pass.passedViewController' (0x105dbfdf8). (lldb)
You can pass data via segues or protocols. Since you are using segues i will show you a complete example and how to do it the right way in Swift 3. Using only two ViewControllers.
Create two UITextFields in the main "ViewController".
Create a new view controller of type UIViewController call it "MainTabelViewController" and add a tableView in it. Select content Dynamic prototypes Style Grouped and create 1 prototype cell and add a UILabel to it for the city name. "Don't forget the put the cell identifier name". I called it "cell".
Add the delegates and data sources to the class and add its functions like in code.
Create a segue from the main view controller to the main table view controller. And create another segue the opposite direction. "Don't forget the put the segue identifier names" I called them "toCity" & "toMain"
Create a "CityTableViewCell" controller of type UITableViewCell and create an IBOutlet of UILabel type where you will save the city name in as a text.
Edit this part in the AppDelegate.swift To delete the city names saved using in the UserDefaults every time the app is launched. So i wont populate the UITextFields randomly every time.
import UIKit
#UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
var userDefaults: UserDefaults!
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
userDefaults = UserDefaults.standard
userDefaults.removeObject(forKey: "City One")
userDefaults.removeObject(forKey: "City Two")
return true
}
This is the ordinary main ViewController.swift where you have your UITextFields in. I distinguish which UITextField did the user click on using the tags. You need to add also the UITextFieldDelegate protocol to be able to use the the textFieldDidBeginEditing function. And i also save the selected city names using UserDefaults class to call them when user chooses the other city.
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet var cityOneLabel: UITextField!
#IBOutlet var cityTwoLabel: UITextField!
#IBOutlet var continueButton: UIButton!
var selectedCityOne = ""
var selectedCityTwo = ""
var userDefaults: UserDefaults!
override func viewDidLoad() {
super.viewDidLoad()
cityOneLabel.delegate = self
cityTwoLabel.delegate = self
cityOneLabel.tag = 1
cityTwoLabel.tag = 2
continueButton.isEnabled = false
}
override func viewDidAppear(_ animated: Bool) {
userDefaults = UserDefaults.standard
cityOneLabel.text = selectedCityOne
cityTwoLabel.text = selectedCityTwo
if selectedCityOne != "" {
userDefaults.set(selectedCityOne, forKey: "City One")
} else {
cityOneLabel.text = userDefaults.string(forKey: "City One")
}
if selectedCityTwo != "" {
userDefaults.set(selectedCityTwo, forKey: "City Two")
} else {
cityTwoLabel.text = userDefaults.string(forKey: "City Two")
}
if cityOneLabel.text != "" && cityTwoLabel.text != "" {
continueButton.isEnabled = true
} else {
continueButton.isEnabled = false
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func continueButtonAction(_ sender: UIButton) {
//Later on continue after selecting the cities
}
func textFieldDidBeginEditing(_ textField: UITextField) {
performSegue(withIdentifier: "toCity", sender: textField.tag)
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "toCity" {
guard let cityVC = segue.destination as? MainTableViewController else {
return
}
cityVC.selectedTextField = sender as! Int
}
}
}
In the CityTabelViewCell.swift add the IBOutlet UILabel for the city name.
import UIKit
class CityTableViewCell: UITableViewCell {
#IBOutlet var cityNameLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
For the MainTabelViewController.swift write this:
Here is where i create an array of strings to populate my table view UILabels with.
import UIKit
class MainTableViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet var cityTabelView: UITableView!
var cityNamesArray = ["Cairo", "Alexandria", "Suez"]
var selectedTextField = Int()
var selectedCityName = ""
override func viewDidLoad() {
super.viewDidLoad()
cityTabelView.delegate = self
cityTabelView.dataSource = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath) as! CityTableViewCell
cell.cityNameLabel.text = cityNamesArray[indexPath.row]
return cell
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return cityNamesArray.count
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
selectedCityName = cityNamesArray[indexPath.row]
performSegue(withIdentifier: "toMain", sender: self)
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
var title = ""
if selectedTextField == 1 {
title = "City One"
} else if selectedTextField == 2 {
title = "City Two"
}
return title
}
// 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?) {
if segue.identifier == "toMain" {
guard let mainVC = segue.destination as? ViewController else {
return
}
if selectedTextField == 1 {
mainVC.selectedCityOne = selectedCityName
} else if selectedTextField == 2 {
mainVC.selectedCityTwo = selectedCityName
}
}
}
}
This is how my layout looks like. Try it. I just added a continue button too if the user will have to go to another UIViewController after selecting the two cities.
If you want to segue to MainVC, you should instantiate a view controller from that class in prepare for segue.
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let passing = segue.destination as! ViewController
passing.passedCity2 = sender as! String
}
Change ViewController to whatever the name of your class is for MainVC.
If you want to go back to the Parent View, you should be using an unwind-segue.
For that you must create the unwind segue method in the Parent View like this
#IBAction func unwindSegueFromChild(segue: UIStoryboardSegue){
// This code executes when returning to view
}
And in your child view you must create the unwind segue ctrl+dragging
There a dropdown appears and you select unwindSegueFromChild
Once you've done that, you must assign the unwind segue an identifier and programmatically perform it like a normal segue.
This is my TableViewController: Cells will segue to First controller
import UIKit
class SubjectsTableViewCell: UITableViewCell {
#IBOutlet weak var subjectImage: UIImageView!
#IBOutlet weak var subjectName: UILabel!
}
class AddQuestionTableViewController: UITableViewController {
var Subjects = ["Geology", "Mathematics", "Computer", "English", "History", "Science"]
override func viewDidLoad() {
super.viewDidLoad()
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return (Subjects.count)
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
performSegue(withIdentifier: "pickedSubjectSegue", sender: Subjects[indexPath.row])
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
let next = segue.destination as! SubViewController
next.myLabel = sender as! String
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! SubjectsTableViewCell
cell.subjectName?.text = Subjects[indexPath.row]
cell.subjectImage?.image = UIImage(named: (Subjects[indexPath.row] + ".jpeg"))
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
How can I move to second view controller using the Add navigation bar item?
What I tried: ctrl + dragging then modal - failed.
Should I use action or segue? But i already use segue in the table cells.
Any help is greatly appreciated. Thanks
Connect seque to second view controller and give it a name other than the segue that is connected to first view controller i.e. pickedSubjectSegue
Example: "secondSegue"
Then in prepareSegue method check the identifiers of both segues before performing any operation:
Code:
override func prepare(for segue: UIStoryboardSegue, sender: Any?)
{
if segue.identifier = "pickedSubjectSegue"
{
let next = segue.destination as! SubViewController
next.myLabel = sender as! String
}
else
{
//Write your code here
}
}
I have a view controller which is used as a table view. From the table view I wish to select an item from the rows available and once selected I wish for that chosen thing to be the name of a label in a second view controller.
So
tableViewController - select an item from the list in the table
secondViewcontroller - label name is what is selected in the tableViewController
I have looked around and there is talk of using NSNotification but I can't seem to get it to work, in addition to using prepareForSegue.
My relevant code for the tableViewContrller is this:
//MARK Table View
//number of sections the table will have
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
//number of rows each section of the table will have
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return peripheralArray.count
}
//the way the data will be displayed in each row for the sections
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
let BluetoothNaming = peripheralArray[indexPath.row].peripheral.name
cell.textLabel?.text = BluetoothNaming
return cell
}
//what happens when we select an item from the bluetooth list
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
stopScanning()
peripheral = peripheralArray[(indexPath as NSIndexPath).row].peripheral
print ("connecting to peripheral called \(peripheral)")
//store the name of the connected peripeheral
let connectedPeripheral = peripheral
manager?.connect(connectedPeripheral!, options: nil)
performSegue(withIdentifier: "segueBackwards", sender: nil)
}
My secondViewController does not have much on its just the label:
import UIKit
class HomepageViewController: UIViewController {
#IBOutlet var ConnectionLabel: UILabel!
func changeBlueoothLabel() {
self.ConnectionLabel.text = "aaaa"
}
}
What do I need to do so that when I select a row in the table that the label in the secondViewController changes its label to reflect it.
Furthermore, if I wanted to change it so that I have another label on the secondViewController and I wanted to change it from disconnected to connected, would there be much more work involved?
Many thanks
to pass data add a string variable in the HomepageViewController and implement prepareForSegue method to pass selected name from tableViewController to HomepageViewController
in HomepageViewController
var selectedName: String?
in tableViewController:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showHomePage" {
if let indexPath = self.tableView.indexPathForSelectedRow {
let peripheral = peripheralArray[indexPath.row].peripheral.name
let homeController = segue.destination as! HomepageViewController
homeController.selectedName = peripheral
}
}
in HomepageViewController
import UIKit
class HomepageViewController: UIViewController {
#IBOutlet var ConnectionLabel: UILabel!
var selectedName: String?
override func viewDidLoad() {
super.viewDidLoad()
// Used the text from the First View Controller to set the label
if let name = selectedName {
ConnectionLabel.text = name
}
}
}