-> I have taken a class which is a child of NSObject in that class I have created the tableView object.
-> The numberOfRowsInSection & cellForRowAt methods are in the same class
-> I have even assigned the object of the same class to the dataSource & delegate property
So my problem is the numberOfRowsInSection is getting called but the cellForRowAt is not getting called. I am just getting a tableView without any cell.
-> I have checked that the numberOfRowsInSection is not returning 0
Please Check The Code Below:
This is the class that I have created. I am creating the object of this class in a UIViewController child class
NOTE:-
1) I have called the configureTV() function in the init method.
In this configureTV() I have assigned both the dataSource & delegate property its value.
2) I have verified that the configureTV() method is getting called
3) I have verified that I am registering the reuseId for the cell
4) I have checked that the dataSource property is being assigned the reference or the object of the class successfully
5) I have verified that the numberOfRows & numberOfSection methods are being called. Even I have tried these two methods with hardcoded values as well
import UIKit
class MyClass:NSObject,UITableViewDataSource,UITableViewDelegate
{
var superView:UIView!
var tableView:UITableView = UITableView()
let value = ["A","B","C","D","E","F"]
override init()
{
super.init()
}
convenience init(superView:UIView)
{
self.init()
self.superView = superView
self.configureTV()
print("SuperView Initialized")
}
func configureTV()
{
self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "c")
self.tableView.dataSource = self
self.tableView.delegate = self
self.tableView.frame = self.superView.frame
self.superView.addSubview(self.tableView)
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
print(value.count)
return value.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = tableView.dequeueReusableCell(withIdentifier: "c", for: indexPath)
cell.backgroundColor = .green
cell.textLabel?.text = value[indexPath.row]
return cell
}
}
//-------Creating The Object Of The Above Class------------
class ABCD:UIViewController
{
override func viewDidLoad()
{
let obj = MyClass(superView: self.view)
}
}
----------------------------I Got The Solution-------------------------
I found the solution by myself but the solution is very strange.
Inside the class ABCD I have created an object as Shown below
//Code Before Being Corrected: —
class ABCD:UIViewController
{
override func viewDidLoad()
{
let obj = MyClass(superView: self.view)
}
}
Now I have done a very minor change i.e. I have made the “obj” variable as the property of the class & the
Problem got solved.
//Code After Correction Which Solved The Problem:—
class ABCD:UIViewController
{
var obj:MyClass!
override func viewDidLoad()
{
obj = MyClass(superView: self.view)
}
}
I want to know why this happened.
Related
Here's my DisruptionsViewController which has the tableView. the function setUp() is used in another ViewController class to set up the DisruptionsViewController.
public class DisruptionsInfoViewController: UIViewController {
#IBOutlet weak var tableView: UITableView!
public override func viewDidLoad() {
super.viewDidLoad()
self.setUp()
tableView.dataSource = self
tableView.delegate = self
tableView.register(UINib(nibName: "DisruptionInfoTableViewCell", bundle: nil), forCellReuseIdentifier: "disruptionsInfoTableViewCell")
}
private func loadFromNib() -> UIView? {
let nibName = String(describing: DisruptionsInfoViewController.self)
let nib = UINib(nibName: nibName, bundle: Bundle(for: type(of: self)))
return nib.instantiate(withOwner: self, options: nil).first as? UIView
}
public func setUp() {
guard let disruptionsInfoViewController = self.loadFromNib() else { return }
disruptionsInfoViewController.frame = self.view.bounds
}
}
extension DisruptionsInfoViewController: UITableViewDataSource, UITableViewDelegate {
public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 2
}
public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let cell = tableView.dequeueReusableCell(withIdentifier: "disruptionsInfoTableViewCell", for: indexPath) as? DisruptonInfoTableViewCell else { return UITableViewCell() }
return cell
}
}
Here's the tableViewCell class.
import UIKit
class DisruptonInfoTableViewCell: UITableViewCell {
#IBOutlet weak var testLabel: UILabel!
}
I can see the tableView in the view debugger, but unable to see it in the view as the tableViewCell is not registered for some reason.
Here's how I am using it in another controller's delegate method
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
guard let viewModel = presenter.headerViewModel(for: section) else { return nil }
let dateSummaryView = DateSummaryView(frame: .zero)
dateSummaryView.setup(with: viewModel)
let disruptionsViewController = DisruptionsInfoViewController()
return disruptionsViewController.view
}
Does anyone know where the problem could be?
I tried following tutorials from YouTube and other articles, they use the same approach but for some reason it doesn't work for me.
First, as mentioned in the comments, nothing in your setUp() is doing anything, so it can be removed.
The reason you are not seeing your table view rows in your other table's section header views is because here (I'll ignore the first three lines since they have nothing to do with this):
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
//guard let viewModel = presenter.headerViewModel(for: section) else { return nil }
//let dateSummaryView = DateSummaryView(frame: .zero)
//dateSummaryView.setup(with: viewModel)
let disruptionsViewController = DisruptionsInfoViewController()
return disruptionsViewController.view
// as soon as we return, disruptionsViewController is released
// and no code it contains will be executed
}
You created an instance of DisruptionsInfoViewController, pulled out its view, and then tossed away the controller code.
If you want to use this approach (rather odd, but we have to assume you have a logical reason to do this), you need to keep a reference to DisruptionsInfoViewController so its code can be used:
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let disruptionsViewController = DisruptionsInfoViewController()
// add disruptionsViewController as a child view controller
// this will "hold on to it" so its code can execute
addChild(disruptionsViewController)
disruptionsViewController.didMove(toParent: self)
return disruptionsViewController.view
}
Now, this is technically incorrect, as Apple's docs state:
Call the addChildViewController: method of your container view controller.
Add the child’s root view to your container’s view hierarchy.
Add any constraints for managing the size and position of the child’s root view.
Call the didMoveToParentViewController: method of the child view controller.
But, because we are returning the view for use as a section header view, we cannot perform 2. before calling didMove(toParent: self).
You didn't include in your post (or mention in your comments) how you're setting the Height of the section header, so, using:
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
return 150.0
}
We get this with your original code - section header view background color is blue, the "table view in header view" background color is green:
and we get this when using addChild():
Here is a complete example project: https://github.com/DonMag/Disrupt
While this will work, if you really want to embed a table view in another table view's section header(s), there are better ways to do it.
I need to create a view that contains a vertical stack view, which holds a Label, a TableView, another Label, and a Button (in descending order). I have been struggling trying to configure the TableView, as I cannot get it to fill with cells (currently just appears as a blank space in the super view). Right now, I have a ViewController for the main view - 'YourOrderViewController' - and a TableViewController for the TableView - 'OrderItemsTableViewController'. It looks like this:
The main view
class YourOrderViewController: UIViewController{
var cellTitle = String()
var cellSubtitle = String()
#IBOutlet weak var orderListTable: UITableView!
let orderTableController = OrderItemsTableViewController()
override func viewDidLoad() {
super.viewDidLoad()
orderListTable.delegate = orderTableController
orderListTable.dataSource = orderTableController
}
And the TableView subview
class OrderItemsTableViewController: UITableViewController {
var drinkOrderList = [Drink]()
var foodOrderList = [Food]()
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
if section == 0 {
return drinkOrderList.count + foodOrderList.count + 1
} else {
return 0
}
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCell(withIdentifier: "OrderItemCell", for: indexPath)
if indexPath.row < drinkOrderList.count {
cell.textLabel?.text = drinkOrderList[indexPath.row].drinkName
} else if indexPath.row - drinkOrderList.count < foodOrderList.count {
cell.textLabel?.text = foodOrderList[indexPath.row].foodName
} else {
print("Also here")
cell = tableView.dequeueReusableCell(withIdentifier: "AddToOrderCell", for: indexPath)
}
return cell
}
I initially tried making the whole thing in one view controller, a UIViewController that was the delegate and data source of the UITableView, but that did not work either. Any help is appreciated.
Plain & simple you are over doing it.
For example:
orderListTable.delegate = orderTableController
orderListTable.dataSource = orderTableController
orderTableController instance of OrderItemsTableViewController is a controller type, instead it should an NSObject type of class which conforms to tableView delegate & datasource.
class TableViewDataSource: NSObject, UITableViewDataSouce {
// no need of controller's life cycle
// just declare all & implement all protocol required
}
class TableViewDelegate: NSObject, UITableViewDelegate {
// have some property where you could set the data after you initialize this object
}
Now you could do
let _delegate = TableViewDelegate()
let _dataSource = TableViewDataSource()
_dataSource.someDataProperty = data //<-- important
orderListTable.delegate = _delegate
orderListTable.dataSource = _dataSource
Also, in you controller, you need to add method to reload this tableView
In your cellForRowAt, just use one custom cell for now until you got it working
I'm a newbie to Swift and XCode, taking a class in iOS development this summer. A lot of projects we're doing and examples I'm seeing for UI elements like PickerViews, TableViews, etc. are defining everything in the ViewController.swift file that acts as the controller for the main view. This works fine, but I'm starting to get to the point of project complexity where I'd really like all of my code to not be crammed into the same Swift file. I've talked to a friend who does iOS development on the side, he said this is sane and reasonable and well in-line with proper object-oriented programming... but I just can't seem to get it to work. Through trial and error I've gotten to this situation: the app runs in the simulator, the UITableView appears, but I'm not getting it populated with entries. I can get it working just fine when all the code is in the ViewController, but once I start trying to create a new controller class and make an instance of that class the dataSource/delegate of the UITableView I start getting nothing. I feel like I'm either missing some core understanding of Swift here, or doing something wrong with the Interface Builder in XCode.
My end result should be a UITableView with three entries in it; currently I'm getting a UITableView with no entries. I'm following along with a few different examples I've Googled, but primarily this other SO question: UITableView example for Swift
ViewController.swift:
import UIKit
class ViewController: UIViewController{
#IBOutlet var stateTableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
var viewController = StateViewController()
self.stateTableView.delegate = viewController
self.stateTableView.dataSource = viewController
}
}
StateViewController.swift:
import UIKit
class StateViewController: UITableViewController{
var states = ["Indiana", "Illinois", "Nebraska"]
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int
{
return states.count;
}
func tableView(cellForRowAttableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = UITableViewCell(style:UITableViewCellStyle.default, reuseIdentifier:"cell")
cell.textLabel?.text = states[indexPath.row]
return cell
}
}
In XCode I have the UITableView hooked up to the View Controller; the outlets are set to dataSource and delegate and the referencing outlet is stateTableView.
I'm not getting any errors; I do get a warning on my `var viewController = StateViewController()' statement in ViewController.swift where it wants me to use a constant, but switching it to a constant doesn't change the behavior (this is as it should be, I assume).
Originally I assumed that the error was in my StateViewController.swift file, where I'm not creating an object that adheres to the UITableViewDataSource or UITableViewDelegate protocol, but if I even add them into the class statement I immediately get errors like "Redundant conformance of 'StateViewController' to protocol 'UITableViewDataSource'" - I'm reading that this is because inheriting from UITableViewController automatically inherits the other protocols as well.
The last thing I tried was instead referring to self.states in the StateViewController's tableView functions, but I'm pretty sure self in Swift works the same as it does in Python and it feels like I'm just trying to add magic words at this point.
I've investigated as far as my currently-limited Swift knowledge can take me, so any answer that explains what I'm doing wrong rather than just telling me what to fix would be very appreciated.
Your issue is being caused by a memory management problem. You have the following code:
override func viewDidLoad() {
super.viewDidLoad()
var viewController = StateViewController()
self.stateTableView.delegate = viewController
self.stateTableView.dataSource = viewController
}
Think about the lifetime of the viewController variable. It ends when the end of viewDidLoad is reached. And since a table view's dataSource and delegate properties are weak, there is no strong reference to keep your StateViewController alive once viewDidLoad ends. The result, due to the weak references, is that the dataSource and delegate properties of the table view revert back to nil after the end of viewDidLoad is reached.
The solution is to create a strong reference to your StateViewController. Do this by adding a property to your view controller class:
class ViewController: UIViewController{
#IBOutlet var stateTableView: UITableView!
let viewController = StateViewController()
override func viewDidLoad() {
super.viewDidLoad()
self.stateTableView.delegate = viewController
self.stateTableView.dataSource = viewController
}
}
Now your code will work.
Once you get that working, review the answer by Ahmed F. There is absolutely no reason why your StateViewController class should be a view controller. It's not a view controller in any sense. It's simply a class that implements the table view data source and delegate methods.
Although I find it more readable and understandable to implement dataSource/delegate methods in the same viewcontroller, what are you trying to achive is also valid. However, StateViewController class does not have to be a subclass of UITableViewController (I think that is the part that you are misunderstanding it), for instance (adapted from another answer for me):
import UIKit
// ViewController File
class ViewController: UIViewController {
var handler: Handler!
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
handler = Handler()
tableView.dataSource = handler
}
}
Handler Class:
import UIKit
class Handler:NSObject, UITableViewDataSource {
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("myCell")
cell?.textLabel?.text = "row #\(indexPath.row + 1)"
return cell!
}
}
You can also use adapter to resolve this with super clean code and easy to understand, Like
protocol MyTableViewAdapterDelegate: class {
func myTableAdapter(_ adapter:MyTableViewAdapter, didSelect item: Any)
}
class MyTableViewAdapter: NSObject {
private let tableView:UITableView
private weak var delegate:MyTableViewAdapterDelegate!
var items:[Any] = []
init(_ tableView:UITableView, _ delegate:MyTableViewAdapterDelegate) {
self.tableView = tableView
self.delegate = delegate
super.init()
tableView.dataSource = self
tableView.delegate = self
tableView.rowHeight = UITableViewAutomaticDimension
tableView.register(UITableViewCell.self, forCellReuseIdentifier: "cell")
}
func setData(data:[Any]) {
self.items = data
reloadData()
}
func reloadData() {
tableView.reloadData()
}
}
extension MyTableViewAdapter: UITableViewDataSource, UITableViewDelegate {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = "Hi im \(indexPath.row)"
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
tableView.deselectRow(at: indexPath, animated: true)
delegate?.myTableAdapter(self, didSelect: items[indexPath.row])
}
}
Use Plug and Play
class ViewController: UIViewController, MyTableViewAdapterDelegate {
#IBOutlet var stateTableView: UITableView!
var myTableViewAdapter:MyTableViewAdapter!
override func viewDidLoad() {
super.viewDidLoad()
myTableViewAdapter = MyTableViewAdapter(stateTableView, self)
}
func myTableAdapter(_ adapter: MyTableViewAdapter, didSelect item: Any) {
print(item)
}
}
You are trying to set datasource and delegate of UITableView as UITableViewController. As #Ahmad mentioned its more understandable in same class i.e. ViewController, you can take clear approach separating datasource and delegate of UITableView from UIViewController. You can make subclass of NSObject preferably and use it as datasource and delgate class of your UITableView.
You can also also use a container view and embed a UITableViewController. All your table view code will move to your UITableViewController subclass.Hence seprating your table view logic from your View Controller
Hope it helps. Happy Coding!!
The way I separate those concerns in my projects, is by creating a class to keep track of the state of the app and do the required operations on data. This class is responsible for getting the actual data (either creating it hard-coded or getting it from the persistent store). This is a real example:
import Foundation
class CountriesStateController {
private var countries: [Country] = [
Country(name: "United States", visited: true),
Country(name: "United Kingdom", visited: false),
Country(name: "France", visited: false),
Country(name: "Italy", visited: false),
Country(name: "Spain", visited: false),
Country(name: "Russia", visited: false),
Country(name: "Moldova", visited: false),
Country(name: "Romania", visited: false)
]
func toggleVisitedCountry(at index: Int) {
guard index > -1, index < countries.count else {
fatalError("countryNameAt(index:) - Error: index out of bounds")
}
let country = countries[index]
country.visited = !country.visited
}
func numberOfCountries() -> Int {
return countries.count
}
func countryAt(index: Int) -> Country {
guard index > -1, index < countries.count else {
fatalError("countryNameAt(index:) - Error: index out of bounds")
}
return countries[index]
}
}
Then, I create separate classes that implement the UITableViewDataSource and UITableViewDelegate protocols:
import UIKit
class CountriesTableViewDataSource: NSObject {
let countriesStateController: CountriesStateController
let tableView: UITableView
init(stateController: CountriesStateController, tableView: UITableView) {
countriesStateController = stateController
self.tableView = tableView
self.tableView.register(UITableViewCell.self, forCellReuseIdentifier: "UITableViewCell")
super.init()
self.tableView.dataSource = self
}
}
extension CountriesTableViewDataSource: UITableViewDataSource {
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// return the number of items in the section(s)
return countriesStateController.numberOfCountries()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// return a cell of type UITableViewCell or another subclass
let cell = tableView.dequeueReusableCell(withIdentifier: "UITableViewCell", for: indexPath)
let country = countriesStateController.countryAt(index: indexPath.row)
let countryName = country.name
let visited = country.visited
cell.textLabel?.text = countryName
cell.accessoryType = visited ? .checkmark : .none
return cell
}
}
import UIKit
protocol CountryCellInteractionDelegate: NSObjectProtocol {
func didSelectCountry(at index: Int)
}
class CountriesTableViewDelegate: NSObject {
weak var interactionDelegate: CountryCellInteractionDelegate?
let countriesStateController: CountriesStateController
let tableView: UITableView
init(stateController: CountriesStateController, tableView: UITableView) {
countriesStateController = stateController
self.tableView = tableView
super.init()
self.tableView.delegate = self
}
}
extension CountriesTableViewDelegate: UITableViewDelegate {
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("Selected row at index: \(indexPath.row)")
tableView.deselectRow(at: indexPath, animated: false)
countriesStateController.toggleVisitedCountry(at: indexPath.row)
tableView.reloadRows(at: [indexPath], with: .none)
interactionDelegate?.didSelectCountry(at: indexPath.row)
}
}
And this is how easy is to use them from the ViewController class now:
import UIKit
class ViewController: UIViewController, CountryCellInteractionDelegate {
public var countriesStateController: CountriesStateController!
private var countriesTableViewDataSource: CountriesTableViewDataSource!
private var countriesTableViewDelegate: CountriesTableViewDelegate!
private lazy var countriesTableView: UITableView = createCountriesTableView()
func createCountriesTableView() -> UITableView {
let tableViewOrigin = CGPoint(x: 0, y: 0)
let tableViewSize = view.bounds.size
let tableViewFrame = CGRect(origin: tableViewOrigin, size: tableViewSize)
let tableView = UITableView(frame: tableViewFrame, style: .plain)
return tableView
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
guard countriesStateController != nil else {
fatalError("viewDidLoad() - Error: countriesStateController was not injected")
}
view.addSubview(countriesTableView)
configureCountriesTableViewDelegates()
}
func configureCountriesTableViewDelegates() {
countriesTableViewDataSource = CountriesTableViewDataSource(stateController: countriesStateController, tableView: countriesTableView)
countriesTableViewDelegate = CountriesTableViewDelegate(stateController: countriesStateController, tableView: countriesTableView)
countriesTableViewDelegate.interactionDelegate = self
}
func didSelectCountry(at index: Int) {
let country = countriesStateController.countryAt(index: index)
print("Selected country: \(country.name)")
}
}
Note that ViewController didn't create the countriesStateController object, so it must be injected. We can do that from the Flow Controller, from the Coordinator or Presenter, etc. I did it from AppDelegate like so:
class AppDelegate: UIResponder, UIApplicationDelegate {
var window: UIWindow?
let countriesStateController = CountriesStateController()
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
// Override point for customization after application launch.
if let viewController = window?.rootViewController as? ViewController {
viewController.countriesStateController = countriesStateController
}
return true
}
/* ... */
}
If it's never injected - we get a runt-time crash, so we know we must fix it straight away.
This is the Country class:
import Foundation
class Country {
var name: String
var visited: Bool
init(name: String, visited: Bool) {
self.name = name
self.visited = visited
}
}
Note how clean and slim the ViewController class is. It's less than 50 lines, and if create the table view from Interface Builder - it becomes 8-9 lines smaller.
ViewController above does what it's supposed to do, and that's to be a mediator between View and Model objects. It doesn't really care if the table displays one type or many types of cells, so the code to register the cell(s) belongs to CountriesTableViewDataSource class, which is responsible to create each cell as needed.
Some people combine CountriesTableViewDataSource and CountriesTableViewDelegate in one class, but I think it breaks the Single Responsibility Principle. Those two classes both need access to the same DataProvider / State Controller object, and ViewController needs access to that as well.
Note that View Controller had now way to know when didSelectRowAt was called, so we needed to create an additional protocol inside UITableViewDelegate:
protocol CountryCellInteractionDelegate: NSObjectProtocol {
func didSelectCountry(at index: Int)
}
And we also need a delegate property to make the communication possible:
weak var interactionDelegate: CountryCellInteractionDelegate?
Note that neither CountriesTableViewDataSource not CountriesTableViewDelegate class knows about the existence of the ViewController class. Using Protocol-Oriented-Programming - we could even remove the tight-coupling between those two classes and the CountriesStateController class.
My goal is to make a grouped tableView, but for somehow the data is not added to the table View
Here's the story board picture
I added a table View on top of view controller which is
and the code that I wrote seems like it don't work
import UIKit
import Alamofire
import SwiftyJSON
import KeychainAccess
class SettingsViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
let keychain = Keychain(server: "https://genietesting.herokuapp.com", protocolType: .HTTPS)
var profile: [String]?
let aboutGenie = [
"How it works",
"About",
"Contact"
]
override func viewDidLoad() {
super.viewDidLoad()
let firstName = keychain[string: "first_name"]
profile = [
firstName!
]
tableView.dataSource = self
tableView.delegate = self
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 2
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 0 {
return profile!.count
} else {
return aboutGenie.count
}
}
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if section == 0 {
return "Profile"
} else {
return "About Genie"
}
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let tableCell = tableView.dequeueReusableCellWithIdentifier("myCell")
return tableCell!
}
}
and of course, I want to make it clickable so that it would go to its own viewController
After some suggestion, I changed most of my codes above and the result is still the same but this time it shows the header
The result is
airsoftFreak,
There are multiple mistakes I can figure out
There is no IBOutlet for your tableView which is added on top of your ViewController.
So you must be having something like
#IBOutlet var tableView: UITableView!
Your SettingsViewController only confirms to UITableViewDataSource and not to UITableViewDelegate. If you wamt to get didSelectRowAtIndexPath to be triggerred you have to confirm to UITableViewDelegate
class SettingsViewController: UIViewController,UITableViewDelegate,UITableViewDataSource {
As many have noticed and mentioned in their answer you will have to set your viewController as delegate for both UITableViewDelegate,UITableViewDataSource so
self.tableView.dataSource = self
self.tableView.delegate = self
The way you are instantiating cell is wrong as well :) Yopu should not create tableViewCell everytime for each cell :) Go to your TableView in storyBoard add a prototype cell, decorate it the way you want and the set the reusableIndentifier for it. Lets say reusableIndentifier you set is 'myCell'
your cellForRowAtIndexPath will change to
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
//assuming you have different cells for each section
switch indexPath.section {
case 0: let tableCell = tableView.dequeueReusableCellWithIdentifier("myCell")
tableCell.textLabel.text = profile[indexPath.row]
return tableCell
//in swift switch has to be exhaustive so default
default: let secondSectionCell = tableView.dequeueReusableCellWithIdentifier("second_section_cell_identifier")
secondSectionCell.textLabel.text =aboutGenie[indexPath.row]
return secondSectionCell
}
}
Try to drag (ctrl+drag) the tableview to the yellow button at the top of the viewcontroller. You will now see to options: datasource and delegate. Choose one of these to and perform the action again for the other. Now the tableview should be linked to your code.
If the option to make it clickable was a question as well:
With the function didSelectRowAtIndexpath, you can achieve this. There should be a lot of stacks about this issue available.
You probably have not wired the UITableView delegate and dataSource methods to the viewController. You can do this in two ways.
1. programatically
create a tableViewOutlet
override fun viewDidLoad() {
super.viewDidLoad()
yourTableViewOutlet.delegate = self
yourTableViewOutlet.dataSource = self
}
in interfaceBuilder
a) open the document outline in the storyboard.
b) control drag from your tableView to your ViewController.
c) connect delegate and dataSource one by one.
click on the cell will fire the delegate method didSelectRowAtIndexPath
self.tableView.delegate and self.tableView.datasource
override func viewDidLoad() {
super.viewDidLoad()
let firstName = keychain[string: "first_name"]
profile = [
firstName!
]
self.tableView.delegate = self
self.tableView.datasource = self
}
EDIT Answer below in this post
I'm trying to set up a UITableView controller in storyboard, with a separate datasource, and I've hit a wall. The data source doesn't seem to respond to changes or push it's 'updates' to the table view. I've tried implementing the data source in the MainMenuTableViewController which worked fine.
This is my MainMenuTableViewController
override func viewDidLoad() {
super.viewDidLoad()
sharedLightsManager.delegate = self
sharedLightsManager.loadNetworkContext()
dataSource = MainMenuTableViewDataSource(sharedLightsManager: sharedLightsManager)
tableView.dataSource = dataSource
tableView.delegate = dataSource
title = "test"
}
//This method fires each time a change happens
func updateLights(){
lights = sharedLightsManager.localNetworkContext.allLightsCollection.lights
tableView.reloadData()
}
MainMenuDataSource:
class MainMenuTableViewDataSource: NSObject, UITableViewDataSource, UITableViewDelegate
{
let reuseIdentifier = "tableViewCell"
var sharedLightsManager: SharedLightsManager?
var lights = []
init(sharedLightsManager: SharedLightsManager)
{
self.sharedLightsManager = sharedLightsManager
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return lights.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = tableView.dequeueReusableCellWithIdentifier("tableViewCell", forIndexPath: indexPath) as UITableViewCell
var lights = sharedLightsManager!.localNetworkContext.allLightsCollection.lights
var light = LFXLight()
if lights.count == 0 {
println("Lights array still loading...")
} else {
light = lights[indexPath.row] as LFXLight
}
return cell
}
}
and here is my outlets:
I've just figured it out. A bit embarrassing. It was due to the lights array not having any objects in it, so obv. lights.count would return 0, therefore no rows...
The data source will not push updates unless the UITableView is told to reloadData. If you change the numberOfRows value, it will not update unless the tableView is notified through methods like insertRowAtIndexPath, reloadData, deleteRowAtIndexPath etc.