conditional Segue in Dynamic Prototype Cells - ios

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);

Related

didSelectRowAt Swift 3 Not Called even after delegate and dataSource are set

This question seems to have been asked many times on StackOverflow, but after searching for hours, I still haven't found the solution to my issue.
I have a table view in SecondViewController.swift and I did make it delegate and dataSource SecondViewController.swift, but the didSelectRowAt method is still not fired when a table cell is clicked. I am trying to apply a segue to another view controller, but the didSelectRowAt method isn't working itself.
I have selected Single Selection in my storyboard in the table view properties, and I have made sure that user interaction is enabled for the table view and the prototype cell.
For the SecondViewController.swift below, please assume that allEvents are populated into the allEvents array. I was able to successfully populate them and display them in the table. The only problem is clicking on the row to perform a segue. Also, please ignore the awkward indentation below.
SecondViewController.swift
import UIKit
class SecondViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet var tableView: UITableView!
var allEvents: Array<JSON> = []
override func viewDidLoad() {
super.viewDidLoad()
tableView.delegate = self
tableView.dataSource = self
//self.tabBarItem.image = myTabImage
self.tabBarController?.tabBar.isTranslucent = false
self.tabBarController?.tabBar.barTintColor = UIColor(red:0.25, green:0.25, blue:0.25, alpha:1.0)
self.tabBarController?.tabBar.tintColor = UIColor.white
//ASSUME ALL EVENTS ARE POPULATED INTO allEvents
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: Tableview Datasource
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return allEvents.count
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 150
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
print("SEGUE")
self.performSegue(withIdentifier: "oneSegue", sender: allEvents[indexPath.row])
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "eventViewTableCell", for: indexPath) as! EventViewTableCell
return cell
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// let detailController = segue.destination as! EventDetailsController
}
}
I have been on this for hours and still have not found out the problem. I would greatly appreciate any help!
You may want to check your tableview again, do choose single selection.
I'm assuming you are selecting No Selection as the picture bellow
Hope it helps.
I had the same problem on a Controller within a TabBarController.
What fixed it for me was this:
Disable the User Interaction for the Content view
My guess is that it was becoming the responder so it removed the event from the TableView
Note: Since the viewDidLoad assignments to delegate and dataSource became redundant after setting it up in the StoryBoard, I removed them, although leaving them does no harm.
If you do nothing else than calling the segue in didSelectRowAt remove the entire method and connect the segue in Interface Builder to the table view cell (rather than to the controller). The sender parameter will contain the reference to the selected table view cell.
I suspect when you collected and populated your allEvents array did you collect any touch events in there ?
or have you used UIGestureRecognizer in this or it's super view ?
If you have intercepted any touch event to populate your array or any other purpose comment it out and test it with a simple preloaded array like :
let dataSource = ["1", "2", "3", "4"]
let me know if this is not your case so I can find another solution.

UITableViewCell basic style on Storyboard can't select

I have strange behavior with UITableView on Storyboard today. I have created UITableView on Storyboard. After that I drag a PrototyleCell to this table and choose style is Basic. And I implement DataSource and Delegate on my ViewController. It show to simulator normal. But I can't tap to table for select a cell and didSelectCellAtIndexPath don't work too. In Storyboard I have checked selectionStyle. If I change style to another style, It work normally.
So my question is: this is a bug or it is a behavior of UITableView? And anyone can give some explanation for it.
Here is my code: Problem Cell Code. I can't select when use it but when I set another style of cell on storyboard everything will ok.
Thanks in advance
No its neither bug nor normal behavior, you must be doing some basic mistake...
Try following code with tableview and prototype cell in storyboard, Everthing will work.
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
var dataSource = ["Ajay","Ajay","Ajay","Ajay","Ajay","Ajay"]
override func viewDidLoad() {
super.viewDidLoad()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell?
if cell == nil {
cell = UITableViewCell(style: .Value1, reuseIdentifier: "cell")
}
cell!.textLabel?.text = dataSource[indexPath.row]
return cell!
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return dataSource.count
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print(indexPath.row)
} }
Have you added the
tableView: cellForRowAtIndexPath delegate method. This is a required delegate you must implement.

Custom UITableView Header set background colour fail

I created a custom UITableViewHeaderFooterView, and the tableview's background colour is white.
self.contentView.backgroundColor = UIColor.clearColor()
However, the section header's background always appears like gray. How can I remove the gray background??
Since I have override the drawRect func of the UITableView, so I want something to appear behind the header view.
I have tried the following:
a) Change the UITableView style to Grouped, the problem goes, but the header cannot glued on top of the table.
b) Use section header title instead of header view
func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String?
the header's background is transparent, but I have multiple labels.
Can anyone help me to figure this out?
Thanks to #Omkar, the correct way is set
cell.layer.backgroundColor = UIColor.clearColor().CGColor
You need to set the background colour of the content view to clear color and at the same time you also need to set the background color of the tableView cell to clear color. Place this in your viewForHeaderInSection method. You will then be able to see the color set to the tableView.
YourCell.contentView.backgroundColor = UIColor.clearColor()
YourCell.backgroundColor = UIColor.clearColor()
Please find the attached image for my code and also the table view whose style is plain style in storyboard. And i have also added the image of how it looks after running
Thanks
This is my ViewController code, the only difference is I use headerfootview subclass. I set the tableview's background to blue, and if i pull down a little bit, you will see there looks like a mask on header.
class ViewController: UIViewController, UITableViewDataSource, UITableViewDelegate {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
tableView.dataSource = self
tableView.delegate = self
tableView.registerClass(UITableViewHeaderFooterView.self, forHeaderFooterViewReuseIdentifier: "HeaderCell")
// 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.
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 4
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 10
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("CustomCell", forIndexPath: indexPath)
cell.textLabel?.text = "\(indexPath.row)"
return cell
}
func tableView(tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let cell = tableView.dequeueReusableHeaderFooterViewWithIdentifier("HeaderCell") as UITableViewHeaderFooterView!
cell!.textLabel?.text = "Header"
cell!.contentView.backgroundColor = UIColor.clearColor()
cell.backgroundColor = UIColor.clearColor()
return cell
}
}

Swift UITableView didSelectRowAtIndexPath not getting called

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. :)

How to add items to UITableView using Swift?

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).

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