i have been busting my brain trying to figure out how this works, but i can't seem to get it. i have tried using other tutorials, but with the many beta releases, everything keeps changing. i am fairly new to IOS development, so i'm kind of struggling.
in storyboard i have UITableView, which contains a cell with the identifier "myCell".
here's what i have so far. when i run the IOS simulator, nothing is presented on the table view.
any suggestions on how to fix this?
class ViewController: UITableViewController {
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("myCell", forIndexPath: indexPath) as UITableViewCell
cell.textLabel?.text = "Cell #: \(indexPath.row)" // display the row number
return cell
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10; // testing out with 10 cells
}
}
Add the function
optional func numberOfSectionsInTableView(tableView: UITableView) -> Int
and return the number of sections you want.
You should make sure in the storyboard your UITableViewController has the class ViewController like so:
and that ViewController is both the delegate and datasource of the UITableViewController like so (Referencing Outlets):
You should also check that your UITableViewController is set to initialViewController if you don't see any lines at all (check the one at the bottom).
Related
I will be using a dynamic number of cells and resizing the height of the table on that basis. I could work out how to do this myself by I can't seem to resize the table. Whether I use 100 cells or 10 the view is set at the same height.
class generalTableViewController: UITableViewController {
override func viewWillAppear(_ animated: Bool) {
tableView.rowHeight = UITableViewAutomaticDimension
// self.tableView.contentSize.height = 2000
// self.tableView.frame.size.height = 2000
}
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 1000
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
return cell
}
}
UITableViewControllers generally take over the entire view. To occupy only a portion of the view with a UITableView use a UIViewController.
You should use a UIViewController subclass rather than a subclass of UITableViewController to manage a table view if the view to be managed is composed of multiple subviews, only one of which is a table view. The default behavior of the UITableViewController class is to make the table view fill the screen between the navigation bar and the tab bar (if either are present).
See here for Apple guidance. You basically just need to take care of some of the things the controller would normally handle for you.
I'm using a TableViewController that has a table with 2 sections of static cells. This is embedded in a view controller. I cannot get didSelectRowAtIndexPath to run when I tap the cells. I've already check all of the usual suspects from this question as well as this one. When I try with a table view inside a viewcontroller with a dynamic table, I am able to get it to work just fine. Is there an issue with using a TableViewController with static cells that would not allow for using didSelectRowAtIndexPath?
Here is what I have in the custom class for the TableViewController:
import UIKit
class OptionTableViewController: UITableViewController {
#IBOutlet var optionsTable: UITableView!
let numberOfRows = [7,2]
let cellIdentifier = "OptionCells"
override func viewDidLoad() {
super.viewDidLoad()
self.optionsTable.delegate = self
self.optionsTable.dataSource = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 2
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
var rows = 0
if(section < numberOfRows.count){
rows = numberOfRows[section]
}
return rows
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
print("You selected cell #\(indexPath.row)!")
}
}
Update:
I tried replacing the tableviewcontroller and the viewcontroller it was embedded in but I am still not able to get didSelectRowAtIndexPath to run.
Update 2:
Does anyone know if this is possible in Swift 3? I found a working example using Swift 2.2 with a tableviewcontroller and static cells here. Maybe there is a bug doing this with Swift 3?
Wow, so it turns out that didSelectRowAtIndexPath is no longer correct in Swift 3. The correct usage is now didSelectRowAt. I didn't see this mentioned anywhere except this question which I stumbled upon.
This:
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("You selected cell #\(indexPath.row)!")
}
Not This:
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
print("You selected cell #\(indexPath.row)!")
}
It's possible you have the wrong table view hooked up. Normally, a UITableViewController has it's tableView in the view property and you don't need to set up the data source and delegate programatically.
I'm just starting with Swift and xCode, and currently messing around with UITableView, I can't manage to just write 'test' into a table.
I created a UITableViewController in the Storyboard, specified a custom class for it (my swift file below), filled in 'ClientCell' as a reuse identifier of the cell and the code is as follows:
class TableViewController: UITableViewController {
#IBOutlet var clientTable: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
clientTable.dataSource = self.dataSource;
clientTable.delegate = self;
}
func numberOfRowsInSection(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("ClientCell", forIndexPath: indexPath) as! CustomTableViewCell
cell.tableLabel.text = "test"
return cell
}
}
In the storyboard, I added a 'UILabel' into the prototype cell, and created an outlet for it named 'tableLabel' in the CustomTableViewCell.swift.
I confused by all the side-things I've to consider when doing something as simple as this.
When I run it, the simulator just shows a table with a lot of horizontal lines, but nowhere it says 'test'.
You haven't used the numberOfRowsInSection method.....
Additionally you also need to set the table view's data source and delegate to be the class you are writing these methods in (in case you haven't).
At a bare minimum you need this:
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 1 // this should really be from your data source
}
If you create a UITableViewController subclass in Xcode the template will have commented-out versions of all the methods you likely will want to fill out.
Another noob question but I could really do with some help on this one. I am looking for a way to have a list of cells in a dynamic prototype table view and each cell to go to a new view controller. I have managed to do this to about 75% :/. Basically I have made it work but it always loads the first cell first because its reuse identifier is called cell. Is there a way to make each one just load the View Controller I want? (code below)
Thanks
Sam
Edit 1: I have changed code to how it now looks below. But the Alton Barnes view controller is still loading in front of which ever cell you click and want to see.
import UIKit
class LocalAttractionsTableViewController: UITableViewController {
#IBOutlet weak var menuButton: UIBarButtonItem!
var Locations = ["Alton Barnes White Horse","Avebury","Barbury Castle","Bowood","Broad Town White Horse","Caen Locks","Cherhill White Horse","Corsham Court","Devices white Horse","Dragon Hill","Hackpen Hill White Horse","Iford Manor","Lacock","Longleat House","Longleat Safari Park","Marlborough white Horse","Pewsey White Horse","Salisbury Cathedral","Sheldon Manor","Silbury Hill","Stonehenge","The Barge Inn","Uffington White Horse","Westbury White Horse","West Kennet Long Barow","Wilton Windmill","Woodhenge"]
override func viewDidLoad() {
super.viewDidLoad()
// Side Menu
if self.revealViewController() != nil {
menuButton.target = self.revealViewController()
menuButton.action = "revealToggle:"
self.view.addGestureRecognizer(self.revealViewController().panGestureRecognizer())
}
tableView.backgroundColor = UIColor.grayColor()
tableView.tableFooterView = UIView(frame:CGRectZero)
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 27
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return Locations.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = Locations[indexPath.row]
cell.backgroundColor = UIColor.clearColor()
return cell
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath)
{performSegueWithIdentifier(Locations[indexPath.row], sender:self);
}
}
I guess you have created the segues the wrong way.
If you have ctrl-dragged a segue from the prototype cell in InterfaceBuilder, this segue is performed without code. Then in your code you call performSegueWithIdentifier(...) which causes another segue to trigger.
You need to ctrl-drag all the segues from the tableViewController icon in InterfaceBuilder to the destination viewControllers and then give them the identifiers.
you created a segue with identifier name : Alton . Instead of "Alton" you need to rename the Segue identifier as Alton Barnes White Horse , later you need to do :
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {performSegueWithIdentifier(Locations[indexPath.row], sender:self);
New to IOS development and am having trouble with handling cell selection on a table. Whenever I select, the method is not getting called below - any idea why?
My project structure is:
View Controller -> View -> Table View
The below code demonstrates the method calls. The others get called no problem! I know touch is working as pull down successfully refreshes and on clicking a cell it does become highlighted.
import UIKit
class ViewController: UIViewController, UITableViewDelegate
{
let blah = ["blah1"]
//How many sections are in the table?
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
//How many rows? (returns and int)
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return blah.count
}
//table contents for each cell?
//Each time this is called it'll return the next row and thus build a table...
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
print("Populating each cell of table view!\n")
tableView.rowHeight = 80.0
var cell = UITableViewCell()
var(a) = blah[indexPath.row]
var image : UIImage = UIImage(named: a)!
cell.imageView.image = image
return cell
}
//Code Cell Selected
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath){
println("You selected cell #\(indexPath.row)!")
}
func tableView(tableView: UITableViewDelegate, didDeselectRowAtIndexPath indexPath: NSIndexPath) {
print("wananananaanan" )
println("You deselected cell #\(indexPath.row)!")
}
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.
}
}
Everybody is mentioning to set dataSource and delegate of the tableView.
But after setting also not working fine then sometimes it may happen because of none or disable selection of table view.
To enable it
Go to storyboard -> Select tableView -> click on the attribute inspector ->go to selector -> Select selection as single selection (or multiple selection according to the requirements.)
Please find attached screenshot for your suitability.
You have to set an #IBOutlet to the tableView in you ViewController and set as it's delegate and dataSource to you can see the data an respond to changes in the tableView.
Something like this :
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
}
And implements the UITableViewDataSource protocol too.
Or you can too in the Interface Builder set the ViewController as it's delegate and dataSource (more easy to do I think) and avoid to set manually in code like above. Is up to you.
I hope this help you.
SWIFT 3
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// Do here
}
Use the above delegate method in swift 3
Couple of checks that can help you:-
myTableView.allowsSelection = true
myTableView.delegate = self
Make sure you written didSelectRowAt correctly:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
If you are using UIButton on UITableViewCell then it overlaps cell so check Solution here
I faced the same issue when compared two identical code examples where one was working well and the other was not calling didSelectRowAtIndexPath
Take a look at two possible ways to solve the issue:
1) In the code itself:
#IBOutlet weak var table: UITableView!
override func viewDidLoad() {
table.delegate = self
table.dataSource = self
//data source might be already set if you see contents of the cells
//the main trick is to set delegate
}
2) Using Storyboard or Document Outline (which was the problem in my case cause storyboard changes are not visible in .swift controller classes.
Open Document Outline and Control + Press your TableView
you will see two outlets called "delegate" and "dataSource"
drag them 1 by 1 to the containing ViewController (right onto the yellow circle)
That's it!
Another caveat is tap gesture recognizers. It's a common use case to use tap gesture recognizer to handle different logic within your view controllers with table views, whether that's exiting touch control or first responders.
let tapGesture = UITapGestureRecognizer(target: self, action: #selector(viewTapped))
view.addGestureRecognizer(tapGesture)
E.G. This line of code handles dismissing a date picker in my application and prevents my tableview from calling didSelectRow delegate method
You have to use this: First take a look what are you extending and then use the tableView method.
class YourViewController : UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var mUITableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
// We need to tell to UITableView that we will add the data by ourselves
self.mUITableView.delegate = self
self.mUITableView.dataSource = self
// Register the UITableViewCell class with the tableView
self.mUITableView?.registerClass(UITableViewCell.self, forCellReuseIdentifier: self.cellIdentifier)
// Setup table data
getEvents()
self.mUITableView.allowsSelection = true
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, commitEditingStyle editingStyle: UITableViewCellEditingStyle, forRowAtIndexPath indexPath: NSIndexPath) {
// here to create you cell view
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("You selected cell #\(indexPath.row)!")
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell: UITableViewCell = UITableViewCell(style: UITableViewCellStyle.Subtitle, reuseIdentifier: "subtitleCell")
cell.accessoryType = UITableViewCellAccessoryType.DisclosureIndicator
cell.textLabel?.text = "\(tableData[indexPath.row].name) - (\(tableData[indexPath.row].eventStateId))"
cell.detailTextLabel?.text = tableData[indexPath.row].lastUpdate
return cell
}
}
Another reason you may write this function which allowed to click under condition
func tableView(_ tableView: UITableView, shouldHighlightRowAt indexPath: IndexPath) -> Bool {
if(indexPath.section == 1){
return true
}
return false
}
Another caveat which took me ages to figure out is to make sure that all three of your Table View, your Cell and your Content View all have User Interaction Enabled. Then in Swift 4, at least, you can use:
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
if you are editing your tableView:
tableView.allowsSelectionDuringEditing = true
Another thing to check is the access level for your class & method:
I had a Swift UIViewController class marked #objc public, to make it visible to my objective-c code.
In this context you must add public access to this function, or it will not be called.
public func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
Nothing happened till I've cleaned and built again. :)