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
}
}
Related
I have to create a Web app. I use Split View. In my main view I have and Add button, where I enter the name of the page and its URL, after I press save and it should show up in the UITableView as a new row. All the buttons work, but new row doesn't appear. I'm not sure why.
Here is my main UITableView
import UIKit
import WebKit class WebBrowsers: UITableViewController, NewDelegate {
private var list:[List] = [
List(name: "google", url: URL(string: "https://google.com")),
List(name: "facebook", url: URL(string: "https://www.facebook.com"))
]
#IBOutlet weak var myTableView: UITableView!
#IBAction func addButtonPressed(_ sender: UIBarButtonItem) {
let addContactVC = storyboard?.instantiateViewController(identifier: "AddBrowser") as! AddBrowser
addContactVC.delegate = self
navigationController?.pushViewController(addContactVC, animated: true)
addContactVC.modalPresentationStyle = .fullScreen
}
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = "Browsers"
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem
}
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 {
// #warning Incomplete implementation, return the number of rows
return list.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "myCell", for: indexPath)
cell.textLabel?.text = list[indexPath.row].name
// Configure the cell...
return cell
}
func addSomeCell(name: String?, url:URL!){
let listNew = List.init(name: name,url: url)
self.list.append(listNew)
myTableView.reloadData()
}
/*
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
*/
/*
// Override to support editing the table view.
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCell.EditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
// Delete the row from the data source
tableView.deleteRows(at: [indexPath], with: .fade)
} else if editingStyle == .insert {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destination.
// Pass the selected object to the new view controller.
if segue.identifier == "showDetail"{
if let navcon = segue.destination as? UINavigationController{
if let destination = navcon.visibleViewController as? infoBrowser{
if let row = tableView.indexPathForSelectedRow?.row{
destination.detailUrl = list[row].url
destination.navigationItem.title = list[row].name
}
}
}
}
}
}
public protocol NewDelegate: class{
func addSomeCell(name: String?, url:URL!)}
here is my AddButton ViewController
import UIKit
class AddBrowser: UIViewController {
var delegate: NewDelegate?
#IBOutlet weak var nameTextField: UITextField!
#IBOutlet weak var urlTextField: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
#IBAction func saveButtonPressed(_ sender: UIButton) {
self.delegate?.addSomeCell(name: nameTextField.text!, url: URL(string: urlTextField.text!))
navigationController?.popViewController(animated: true)
}
/*
// 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.destination.
// Pass the selected object to the new view controller.
} }
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.
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.
I have ViewController that contains a UITableView. Data is loaded into that table via the following code:
import UIKit
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, UsernameSentDelegate {
#IBOutlet weak var scrollView: UIScrollView!
#IBOutlet weak var receiveUsername: UILabel!
#IBOutlet weak var userEmailText: UILabel!
var userEmail: String?
var communities = [String]() { didSet { communitiesTableView.reloadData()
}
}
var flag = false
#IBOutlet weak var communitiesTableView: UITableView!
#IBAction func unwindToHome(_ segue: UIStoryboardSegue) {
}
//recieves email address from delegate from LoginViewController
func userLoggedIn(data: String) {
userEmailText.text = data
}
override func viewDidLoad() {
super.viewDidLoad()
self.communitiesTableView.delegate = self
self.communitiesTableView.dataSource = self
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.communities.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let title = self.communities[indexPath.row]
let cell = UITableViewCell()
cell.textLabel?.text = title
return cell
}
I then set up 1 prototype cell within the UITableView so I could create a segue to my second view controller, ShowCommunitiesViewController and named this segue, "showCommunitySegue"
In ShowCommunitiesViewController I have a label set up and ready to use as the title of the cell name carried across, named communityName.
In ViewController I have set up the following function to deal with the segue, including the destination variable for the cell title that has been selected.
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.performSegue(withIdentifier: "showCommunitySegue", sender: self)
showCommunityController.communityName = //what do I put here?
}
What do I need to put on that last line so showCommunityController.communityName displays the cell title?
Just declare selectedCellTitle as String in your viewController where your cells are.
var selectedCellTitle: String?
This will be the global variable keeping track of the selected cell's title.
Add the following in didSelectRowAt:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// Set your global variable to the title
self.selectedCellTitle = self.communities[indexPath.row]
// Trigger your segue
performSegue(withIdentifier: "showCommunitySegue", sender: self)
}
Override prepareforsegue method the following way:
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == "showCommunitySegue" {
// Check if the segue's destination viewcontroller is your viewcontroller
if let showCommunityController = segue.destination as? ShowCommunityViewController {
// Assign the selected title to communityName
showCommunityController.communityName = self.selectedCellTitle
}
}
}
I'm trying to pass the indexPath.row data from the selected cell to the next view controller using both the didSelectCellAtIndexPath and the prepareForSegue methods but the value isnt passing through.
Code for both ViewControllers is show below:
import UIKit
class MainMenu: UIViewController, UITextFieldDelegate, UITableViewDelegate, UITableViewDataSource {
// array of the menu options
let mainMenuOptions = ["Exercises 1", "Exercises 2", "Exercises 3"]
// UITableView
#IBOutlet weak var exerciseOptions: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
exerciseOptions.delegate = self
exerciseOptions.dataSource = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// Table configuration
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "ExercisesTableViewCells"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! ExercisesTableViewCell
cell.textLabel!.text = mainMenuOptions[indexPath.row]
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
// Segue to VC based on row selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if indexPath.row == 0{
self.performSegueWithIdentifier("SegueToExercises", sender: self)
}
else if indexPath.row == 1{
self.performSegueWithIdentifier("SegueToExercises", sender: self)
}
else{
self.performSegueWithIdentifier("SegueToReminders", sender: self)
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "SegueToExercise"){
let viewController = segue.destinationViewController as? ExerciseMenu
viewController!.mainMenuValue = exerciseOptions.indexPathForSelectedRow!.row
}
}
For the Second View Controller:
import UIKit
class ExerciseMenu: UIViewController, UITextFieldDelegate, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var exerciseOptionsTitle: UILabel!
#IBOutlet weak var exerciseOptionsTable: UITableView!
#IBAction func beginWorkout(sender: AnyObject) {
}
// receives data from MainMenu
var mainMenuValue: Int!
override func viewDidLoad() {
super.viewDidLoad()
exerciseOptionsTable.delegate = self
exerciseOptionsTable.dataSource = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cellIdentifier = "ExerciseMenuCell"
let cell = tableView.dequeueReusableCellWithIdentifier(cellIdentifier, forIndexPath: indexPath) as! ExercisesTableViewCell
cell.textLabel!.text = String(mainMenuValue)
return cell
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1
}
See this thread for possible explanations for this behavior.
The first step of troubleshooting would be to put a breakpoint in your prepareForSegue method to see if exerciseOptions.indexPathForSelectedRow is already nil at that point, in which case something is happening before the segue even occurs that's messing with the value (which the link above can help you diagnose).
Try making a property in your table view controller called something like selectedRow, and in didSelectRowAtIndexPath, set self.selectedRow = indexPath.row. This way you have your own variable that'll be more reliable than exerciseOptions.indexPathForSelectedRow. Then change the code in prepareForSegue appropriately. So to give you the full methods as I'm envisioning them:
(As a property of the first view controller) var selectedRow: Int?
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if indexPath.row == 0{
self.performSegueWithIdentifier("SegueToExercises", sender: self)
self.selectedRow = 0
}
else if indexPath.row == 1{
self.performSegueWithIdentifier("SegueToExercises", sender: self)
self.selectedRow = 1
}
else{
self.performSegueWithIdentifier("SegueToReminders", sender: self)
self.selectedRow = indexPath.row
}
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "SegueToExercise"){
let viewController = segue.destinationViewController as? ExerciseMenu
viewController!.mainMenuValue = self.selectedRow!
}
}
Disclaimer: I'm still learning Swift, so my judgment regarding optionals/optional unwrapping might be unideal for a technical reason I'm not aware of, but the overall theory here is sound, I think.