I am trying to implement a UISearchController (not UISearchDisplayController which is deprecated)
I face a ridiculously time eating issue.
When I try to dequeueResusableCellWithIdentifier it doesn't works with my CellAutocompletion (UITableViewCell subclassing)
Like this :
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let item = filteredProducts[indexPath.row]
let cell:CellAutocompletion = self.tableView.dequeueReusableCellWithIdentifier("suggestionCell") as! CellAutocompletion
cell.itemLabel?.text = item.item_name;
return cell
}
This throw me fatal error: unexpectedly found nil while unwrapping an Optional value
BUT when I do this :
let cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "suggestionCell");
It works. So with a Default iOS cell, it works, with my custom cell not. Any idea?
I think I ask the wrong tableview but considering I am inside a TableviewController included inside UISearchController which is used by another VC, I am lost.
My main VC which instanciate my searchController and the TableViewController where I have issue.
//ViewDidLoad
resultsTableController = ProductResultTabController();
resultsTableController.tableView.delegate = self;
self.searchController = UISearchController(searchResultsController: resultsTableController);
searchController.searchResultsUpdater = self;
searchController.dimsBackgroundDuringPresentation = true;
searchController.searchBar.sizeToFit()
tableView.tableHeaderView = searchController.searchBar
My CustomCell Class
class CellAutocompletion:UITableViewCell{
#IBOutlet weak var itemLabel: UILabel!
#IBOutlet weak var parentItemLabel: UILabel!
}
ProductResultTabController (subclass of TableViewController)
class ProductResultTabController: UITableViewController {
var filteredProducts = [ITEM]();
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1;
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return filteredProducts.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let item = filteredProducts[indexPath.row]
let cell:CellAutocompletion = self.tableView.dequeueReusableCellWithIdentifier("suggestionCell") as! CellAutocompletion!
cell.itemLabel?.text = item.item_name;
return cell
}
}
As I understand, your ProductResultTabController lives in the storyboard with the cell prototype. As a consequence, call resultsTableController = ProductResultTabController() doesn't do the most essential part of creating a TableViewController, which is registering your tableView: for a class or nib. You could create your cell in a nib and call tableview.registerNib: in your PRTC viewDidLoad:, but there is an other, slightly more convenient way:
Create your PRTC in the storyboard and prototype the cell (I believe you've already done that)
In SB, go to attributes inspector and give the controller a storyboard ID
3 - In your main VC's viewDidLoad:, replace resultsTableController = ProductResultTabController()`by the following:
let storyboard = UIStoryboard(name: "Main", bundle: nil)
resultsTableController = storyboard.instantiateViewControllerWithIdentifier(myStoryboardID)
Related
i'm trying to use a xib file as cell in a table view. but it says "unexpectedly found nil while unwrapping an Optional value" on registerNib. i think it's about referencing outlet but i don't know why it occurs.
my view is as follow:
as it shows, table view is inside Play Video View Controller.
my viewDidLoad is:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.tableView.registerNib(UINib(nibName: "NewestTableViewCell", bundle: nil), forCellReuseIdentifier: "NewestTableViewCell")
}
and table view methods:
// MARK: - Table view data source
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return video.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell : NewestTableViewCell = tableView.dequeueReusableCellWithIdentifier("NewestTableViewCell") as! NewestTableViewCell
let vd = video[indexPath.row]
cell.title.text = vd.title
cell.title.textAlignment = .Right
cell.duration.layer.borderColor = UIColor.whiteColor().CGColor
cell.duration.layer.borderWidth = 1.0
cell.duration.layer.cornerRadius = 3.0
cell.duration.clipsToBounds = true
cell.duration.text = vd.length
imageDl(vd.imageUrl){ image in
cell.videoImage.image = image
}
cell.time.text = vd.published
cell.time.textAlignment = .Right
cell.viewed.text = vd.view
cell.viewed.textAlignment = .Right
return cell
}
I used this nib in other TableViewControllers but when using in UIViewController which contains tableView, it'n not working. what reason causes this?
thanks
The only thing in the line that could be forcefully unwrapped is your tableView. Check its referencing outlet.
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
}
Usually, We use the dequeueReuseableCellwithIdentifier method in ViewController class but I want to use this method in the UITableViewCell.I have tried but I got the exception like this.
fatal error: unexpectedly found nil while unwrapping an optional value
ViewController Class:
#IBOutlet var tableView: UITableView!
var tableData:[songData] = [songData]()
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.backgroundColor = UIColor.orangeColor()
}
func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return tableData.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = TableViewCell()
cell.datas()
return cell
}
}
TableViewCell Class:
#IBOutlet var text1: UILabel!
#IBOutlet var text2: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
func datas(){
let vc = ViewController()
let tableData = vc.tableData
print(tableData)
let tableview = vc.tableView
let indexpath:NSIndexPath = NSIndexPath()
let cell = tableview.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexpath) as! TableViewCell //The fatal error is showing exactly at this line.
let artistAndAlbum = tableData[indexpath.row]
cell.text1.text = artistAndAlbum.country
cell.text2.text = artistAndAlbum.currency
tableview.reloadData()
}
I need to customize my table data in the TableViewCell class.If it is possible help me or else why it is not possible?
You're going about this the wrong way. It honestly doesn't make any sense for your table cell subclass to be creating itself. It does make sense, however, for your cell subclass to be passed data and for it to populate itself from that.
You should have your view controller dequeue the cell as normal and then change your table cell function to take some data as a parameter and update itself.
In your view controller:
override func viewDidLoad() {
super.viewDidLoad()
tableView.registerNib(UINib(nibName: "INSERT_NIB_NAME", bundle: nil), forCellReuseIdentifier: "Cell")
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as! TableViewCell
cell.updateWithData(tableData[indexPath.row])
return cell
}
If your cell is a prototype cell in the storyboard then you have to set the reuse identifier there instead of registering in viewDidLoad.
In your table cell:
func updateWithData(artistAndAlbum: songData) {
text1.text = artistAndAlbum.country
text2.text = artistAndAlbum.currency
}
In your view controller's viewDidLoad(), register the class with a reuse identifier.
tableView.registerClass(TableViewCell.self, forCellReuseIdentifier: "ID")
Then your cellForRowAtIndexPath method can dequeue your custom cell.
tableView.dequeueReuseableCellWithIdentifier("ID", indexPath: indexPath)
This isn't just limited to view controllers. If you have a custom table view cell, then register the class for a reuse identifier wherever you setup the table view and then dequeue your custom cell with that identifier in its cellForRowAtIndexPath.
As a general rule of thumb, your view should not keep a reference to its view controller. The view shouldn't care about any view controllers or need to know what the view controller is doing. Either the entire table view and all of its workings should go in your view, hidden from the view controller, or you should keep all of your table view code in the view controller. This will make your life much easier.
Firstly you must set name for cell identifier
after it in cellForRowAtIndexPath method used this code:-
for custom cell
CustomCellTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CELL" forIndexPath:indexPath];
//-------------------------------------------------------------
for normal cell
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CELL" forIndexPath:indexPath];
Check your vc.tableView. It's probably nil
I'm using Xcode 7.0, Swift 2
I'm basically trying to create a custom class that will build a UITable, then in the ViewController I make a new object of the table and load it into self.view;
The problem I'm having is that the function func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell isn't being called at all from within the custom class. I've been looking for a solution for 3 days now and I've tried rebuilding the App and code several times with no luck.
Please note, if I use the same code (that is everything required to build the table; excluding init functions, etc) in the ViewController.swift file, it works fine.
I know the problem is with the cellForRowAtIndexPath function because it will not print out the statement I set in that block of code when it runs. All other functions are called, but for some reason this isn't being called. Not sure if I overlooked something here. Any help would be appreciated. Thanks in advance.
class sideTest: NSObject, UITableViewDelegate, UITableViewDataSource {
let tesTable: UITableView = UITableView()
var items: [String]?
var mView: UIView = UIView()
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
print("The number of rows is: \(self.items!.count)")
return self.items!.count
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
print("\nLets create some cells.")
let sCell: UITableViewCell = tableView.dequeueReusableCellWithIdentifier("cell") as UITableViewCell!
sCell.textLabel?.text = self.items![indexPath.row]
sCell.textLabel?.textColor = UIColor.darkTextColor()
return sCell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
print("You selected cell #\(indexPath.row)!")
}
func tblSetup() {
self.tesTable.frame = CGRectMake(0, 0, 320, mView.bounds.height)
self.tesTable.delegate = self
self.tesTable.dataSource = self
self.tesTable.backgroundColor = UIColor.cyanColor()
// load cells
self.tesTable.registerClass(UITableViewCell.self, forCellReuseIdentifier: "Cell")
self.tesTable.reloadData()
print("Currenlty in tblSetup.\nCurrent rows is: \(self.items!.count)")
}
//Init
override init() {
super.init()
self.items = nil
self.tblSetup()
}
init(sourceView: UIView , itemListAsArrayString: [String]) {
super.init()
self.items = itemListAsArrayString
self.mView = sourceView
self.tblSetup()
}
}
Here is the code from ViewController.swift; Please do note that the table gets built, but the cells do not populate, even if I manually enter cell info by doing: sCell.textLabel?.text = "test cell"
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let myTable: sideTest = sideTest(sourceView: self.view, itemListAsArrayString: ["Cell 1", "Cell 2", "Cell 3"])
self.view.addSubview(myTable.tesTable)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Again, any help is greatly appreciated. Thanks.
Your view controller don't have a strong reference to your sideTest var.
Once your view did load finished,your sideTest is nil.Although you have a tableview(by add subview), but you no longer have a data source.
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {}
is called after view did load. That cause the problem.
change your view controller to:
var tb :sideTest?
override func viewDidLoad() {
super.viewDidLoad()
let myTable: sideTest = sideTest(sourceView: self.view, itemListAsArrayString: ["Cell 1", "Cell 2", "Cell 3"])
print(myTable.tesTable.frame)
tb=myTable
self.view.addSubview(myTable.tesTable)
}
change your cellforrowatindexpath to:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
print("create cells")
var cell :UITableViewCell?
if let sCell: UITableViewCell = tableView.dequeueReusableCellWithIdentifier("cell"){
cell=sCell
}else{
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: "cell")
}
cell!.textLabel?.text = self.items![indexPath.row]
cell!.textLabel?.textColor = UIColor.darkTextColor()
return cell!
}
this will fix most of the problems.
Your code:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let myTable: sideTest = sideTest(sourceView: self.view, itemListAsArrayString: ["Cell 1", "Cell 2", "Cell 3"])
self.view.addSubview(myTable.tesTable)
}
I would think that the myTable variable goes out of scope and is released when viewDidLoad finishes, so there is no data source or delegate after that. Did you verify that the self.view.addSubview(myTable.tesTable) retains it? Try moving declaration of myTable outside of the function level (to property level) or add a diagnostic print to deinit..
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.