My app use MMDrawerControllerin order to implement a left drawer which handle a simple menu. A entry of this menu refers to a UITabController which I instantiate in this way.
mainWindowController = self.storyboard?.instantiateViewControllerWithIdentifier("UITabBarController") as! UITabBarController
Now, the first UIViewController used by the TabController has a table view which uses a custom UIViewCell. The class for the custom cell is this:
class NewsCell: UITableViewCell {
#IBOutlet weak var title: UILabel!
#IBOutlet weak var date: UILabel!
#IBOutlet weak var newsText: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
}
I checked that the outlets are properly connected with the correct storybook element. However, my app crash at this instruction,
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("NewsCell", forIndexPath: indexPath) as! NewsCell
with the following error: exception 'NSInvalidArgumentException', reason: '-[UILabel isEqualToString:]: unrecognized selector sent to instance 0x7ff4d362a6f0'.
It seems like I have no set the proper identifier in my inspector; however, obviously, I have done it. The situation of my storyboard is this:
Do anyone have any suggestions which can explain this problem? I hope I made myself clear.
Somewhere you are using isEqualToString Method and instead of passing string to that method,UILabel is passing. Please check. Otherwise put that code, I'll check and let you know.
Related
I'm building an app with multiple scenes and a table view with custom cells in each. I got the home screen table view to work fine and then I segue to the new scene from the custom cells. When it segues, my second view controller crashes.
Here is my code for the view controller
import UIKit
class QuestionViewController: UIViewController {
#IBOutlet weak var questionLabel: UILabel!
#IBOutlet weak var submitButton: UIButton!
#IBOutlet weak var qTableView: UITableView!
var answers : [QuestionOption] = []
override func viewDidLoad() {
super.viewDidLoad()
answers = [QuestionOption(text: "test"), QuestionOption(text: "test"), QuestionOption(text: "test"), QuestionOption(text: "test")]
qTableView.delegate = self
qTableView.dataSource = self
submitButton.setTitle("Submit", for: .normal)
questionLabel.text = "test question"
}
}
extension QuestionViewController: UITableViewDataSource, UITableViewDelegate{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return answers.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let a = answers[indexPath.row]
let cell = qTableView.dequeueReusableCell(withIdentifier: "QuestionOptionCell") as! QuestionOptionCell
cell.setOption(option: a)
return cell
}
}
Here's my code for the cell
import UIKit
class QuestionOptionCell: UITableViewCell {
#IBOutlet weak var cellTitle: UILabel!
func setOption(option: QuestionOption){
cellTitle.text = option.text
}
}
Here's my code for the QuestionOption class
import Foundation
import UIKit
class QuestionOption{
var text: String
init(text: String){
self.text = text
}
}
Crash log
2019-02-20 14:33:28.394695-0800 iQuiz[8935:822409] *** NSForwarding: warning: object 0x7fd608407c40 of class 'iQuiz.QuestionOption' does not implement methodSignatureForSelector: -- trouble ahead
Unrecognized selector -[iQuiz.QuestionOption initWithCoder:]
2019-02-20 14:33:28.395281-0800 iQuiz[8935:822409] Unrecognized selector -[iQuiz.QuestionOption initWithCoder:]
Here's my storyboard if that helps at all
I've made sure my identifier matches and I don't have any extraneous or unconnected outlets, those are the only solution to this problem I can find online.
The crash log says that QuestionOption must be a subclass of NSObject and adopt NSCoding which is overkill in this case. Actually a struct would be sufficient.
You can avoid it by deleting the method in QuestionOptionCell
func setOption(option: QuestionOption){
cellTitle.text = option.text
}
and set the value in cellForRowAt directly by replacing
cell.setOption(option: a)
with
cell.cellTitle.text = a.text
Things to check:
Verify that "QuestionOptionCell" is indeed the reuse identifier for the cell.
Verify that the selected type for the cell is QuestionOptionCell.
In cellForRowAt, use tableView.dequeueReusableCell instead of qTableView.dequeueReusableCell.
Otherwise, share the crash log with us.
I've a custom UITableViewCell, in that I've two UILabels & one UIButton. I'm able to load data...and display it as per requirement.
Problem Statement-1: Now problem exist in my UIButton, which is in my UICustomTableViewCell. Due to this I'm unable to handle click event on that UIButton.
Problem Statement-2: On button Click I have to identify the index of that Button click and pass data to next ViewController using segue.
Now have a look on...what did I've tried for this...
Yes, first-of-all I have thought that Binding IBOutlet action in my CustomCell will resolve my problem...but actually it doesn't solved my problem.
After that I've accessed button using .tag and initialised index path.row to it.
But it won't helped me.
So now I'm using Protocol oriented concept using delegate to handle click event on my UIButton which is available in CustomCell.
What did I tried:
SwiftyTableViewCellDelegate:
protocol SwiftyTableViewCellDelegate : class {
func btnAuditTrailDidTapButton(_ sender: LeadCustomTableViewCell)
}
CustomTableViewCell with delegate:
class LeadCustomTableViewCell: UITableViewCell {
#IBOutlet weak var lblMeetingPersonName: UILabel!
#IBOutlet weak var lblPolicyNo: UILabel!
#IBOutlet weak var btnLeadAuditTrail: UIButton!
weak var delegate: SwiftyTableViewCellDelegate?
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
}
#IBAction func btnAuditTrailTapped(_ sender: UIButton) {
delegate?.btnAuditTrailDidTapButton(self)
}
}
ViewController implementing delegate:
class LeadViewController: UIViewController, UITableViewDelegate, UITableViewDataSource, SwiftyTableViewCellDelegate {
//IBOutlet Connections - for UITableView
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
//setting dataSource & delegates of UITableView with this ViewController
self.tableView.dataSource = self
self.tableView.delegate = self
//Reloading tableview with updated data
self.tableView.reloadData()
//Removing extra empty cells from UITableView
self.tableView.tableFooterView = UIView()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell:LeadCustomTableViewCell = self.tableView.dequeueReusableCell(withIdentifier: "cell") as! LeadCustomTableViewCell
//Assigning respective array to its associated label
cell.lblMeetingPersonName.text = (meetingPersonNameArray[indexPath.section] )
cell.lblPolicyNo.text = (String(policyNoArray[indexPath.section]))
cell.btnLeadAuditTrail.tag = indexPath.section
cell.delegate = self
return cell
}
//This is delegate function to handle buttonClick event
func btnAuditTrailDidTapButton(_ sender: LeadCustomTableViewCell) {
guard let tappedIndexPath = tableView.indexPath(for: sender) else { return }
print("AuditTrailButtonClick", sender, tappedIndexPath)
}
Don't know why this is not working.
Link the touch up inside event in cellForRow by adding the following code:
cell.btnLeadAuditTrail.addTarget(self, action:#selector(btnAuditTrailDidTapButton(_:)), for: .touchUpInside)
I'm trying to follow along the following Using Auto Layout in UITableView for dynamic cell layouts & variable row heights top answer in Swift but for the IOS 7 version to mitigate some bugs in the IOS 8.
Right now, my custom cell class is:
class PostCell: UITableViewCell {
#IBOutlet var name: UILabel!
#IBOutlet var timestamp: UILabel!
#IBOutlet var postBody: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
// Initialization code
}
override func setSelected(selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
// Configure the view for the selected state
}
}
In my Storyboard I set my custom class as the class for the cell. I don't know if I have to use my reuseIdentifier anywhere. I don't know how to get that working in the next piece of code.
func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
var cell = PostCell()
var post = self.posts[indexPath.row]
cell.name.text = post.name
cell.timestamp.text = post.timestamp
cell.postBody.text = post.body
cell.setNeedsUpdateConstraints()
cell.updateConstraintsIfNeeded()
cell.bounds = CGRectMake(0.0, 0.0, CGRectGetWidth(feed.bounds), CGRectGetHeight(cell.bounds))
cell.setNeedsLayout()
cell.layoutIfNeeded()
var height = cell.contentView.systemLayoutSizeFittingSize(UILayoutFittingCompressedSize).height
height += 1.0
return height
}
I thought that would work, but when I call cell.name.text = post.name, I get an EXC_BAD_INSTRUCTION. I'm guessing the cell isn't properly hooked up to the storyboard somehow or something. How do I fix this?
The problem is that you don't understand how nibs work. You have set up your PostCell to be configured when it is loaded from its nib:
class PostCell: UITableViewCell {
#IBOutlet var name: UILabel!
}
So that means that name is nil - until this cell is instantiated from the nib, at which time the outlet will be hooked up. But then later you say:
var cell = PostCell()
But that is the wrong PostCell! You didn't load it from the nib; you just made one out of whole cloth. So since there was no nib-loading, the outlet (as you rightly suspect) was naturally never connected, and so cell.name is nil.
So the solution is: do not make one out of whole cloth. Load it from the nib.
I have a UITableViewController and a custom TableViewCell and within that UITableViewCell there is a UISwitch. This switch is wired to an IBAction, but as soon as i tap the switch, i get an error:
unrecognised selector sent to instance 0x13ce30a50
SelectFriendsViewController.swift
class SelectFriendsViewController: UITableViewController, SelectorDelegate {
func selectUser(string: String) {
selectedUser = string;
}
.... lots of code removed for simplification.
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell:SelectorTableViewCell = tableView!.dequeueReusableCellWithIdentifier("MyCell", forIndexPath: indexPath) as SelectorTableViewCell;
cell.delegate = self;
}
}
protocol SelectorDelegate {
func selectUser(string: String)
}
class SelectorTableViewCell: UITableViewCell {
#IBOutlet var swUser: UISwitch! = UISwitch();
#IBOutlet var lblUserName: UILabel! = UILabel();
var delegate: SelectorDelegate!
#IBAction func SwitchUser(sender: UISwitch) {
//delegate.selectUser("test");
//even with just this println i get the error
println("test");
}
}
You have some strange stuff in this code:
your cellForRowAtIndexPath should return a cell (you probably have done this, and just didn't copy it across to your stackoverflow question)
You're generating your UISwitch either from storyboard or xib as you say 'the switch on the storyboard is highlighted' - however you're also instantiating these in code!
eg.
#IBOutlet var swUser: UISwitch! = UISwitch();
But I believe your problem in the end is related to your IBAction 'SwitchUser'. You either renamed this method at some point or created an IBAction earlier and then deleted it. To check the current status of your IBActions, click on your cell in the storyboard or xib and open the Connections Inspector. I bet you'll find your problem there.
Try changing the function name to switchUser instead of SwitchUser
https://developer.apple.com/library/ios/documentation/Swift/Conceptual/Swift_Programming_Language/Functions.html#//apple_ref/doc/uid/TP40014097-CH10-XID_243
I've linked output from the IB to the code, as shown below.
class DiaryTableViewCell: UITableViewCell {
#IBOutlet weak var TitleLabel: UILabel!
#IBOutlet weak var SubTitleLabel: UILabel!
#IBOutlet weak var leftImageView: UIImageView!
#IBOutlet weak var rightImageView: UIImageView!
}
Here, I'm registering the class:
override func viewDidLoad() {
self.title = "My Diary"
cellNib = UINib(nibName: "TableViewCells", bundle: nil)
tableView.registerClass(DiaryTableViewCell.classForCoder(), forCellReuseIdentifier: kCellIdentifier)
}
But I keep getting the following runtime error:
*** Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '...setValue:forUndefinedKey:]: this class is not key value
coding-compliant for the key SubTitleLabel.'
From within the following code:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCellWithIdentifier(kCellIdentifier) as DiaryTableViewCell?
if (cell == nil) {
tableView.registerClass(DiaryTableViewCell.classForCoder(), forCellReuseIdentifier: kCellIdentifier)
cell = cellNib?.instantiateWithOwner(self, options: nil)[0] as? DiaryTableViewCell
cell?.selectionStyle = .None
}
if (cell != nil) {
println("\(x++)) Inside cell")
cell!.TitleLabel.text = "Hello"
cell!.SubTitleLabel.text = "World"
}
return cell!
}
Specifically, it's happening here:
cell = cellNib?.instantiateWithOwner(self, options: nil)[0] as? DiaryTableViewCell
Question: How am I violating the key value coding-compliant for a UILabel?
This hasn't happened before... UILabel is KVO compliant.
I linked to the WRONG Source!
Here's the result:
You should not be calling instantiateWithOwner yourself inside tableView:cellForRowAtIndexPath.
Register the nib in viewDidLoad and then dequeueReusableCellWithIdentifier will do all the work for you.
The reason for your particular error is that you are calling instantiateWithOwner passing self as the owner and so the nib is trying to wire the outlets up to your UITableViewDataSource implementation class rather than a DiaryTableViewCell.
Show the references of your ViewController rigth-clicking in it on the Document Outline. Probably you will see a warning in one of the references. Delete it and link it again if still need it.
sometimes its like when you create button in your xib, you create one button and copy paste other buttons from one buttons, in that case this error occurs, and yes removed connections from xib could also be an reason.
I have created a TableViewCell same like your & have the same problem. I have research solving the problem but nothing. Then I delete Label in TableViewCell and recreate again, connect it to TableViewCell through File Owner,v..v And the result is right. No error. You should recreate them again.