I have a posts array in which I'm returning all the posts from a PHP file. I'm trying to assign the number of posts to a label in a tableview cell. However, when I assign the number of posts to a label, I'm getting a nil value. Can anyone help with this?
var posts = [AnyObject]()
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 0 {
return 1
} else {
return posts.count
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.section == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell", for: indexPath) as! InfoCell
print(posts.count)
cell.PostsLbl.text = String(posts.count)
return cell
}
}
It looks like you are getting posts async from PHP file and after you get them you reload only the second section.
Related
I have implemented side menu in tableview and now my scenario is like, I have to manage sidemenu options as user types
Let me show my code
var items = ["Social Media Post", "Messages", "Manage User","My Account","Information","Logout"]
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") as! MenuTableViewCell
cell.lblTitle.text = items[indexPath.row]
cell.imgMenuLogo.image = image[indexPath.row]
print(User_type)
if User_type == 2{
items.remove(at: 0)
}
return cell
}
but now i want . to de like this
if user_type == "3"{
// Social Media , Messages And Manage User options i want to remove
}
I am not able to understand how to remove from index.
Try something like this:
override func viewDidLoad() {
super.viewDidLoad()
getList()
}
func getList(){
switch userType{
case 0:
items = ["UserTypeOne_Home","UserType_One Settings","etc"]
break
case 1:
items = ["UserTypeTwo_Home","UserType_Two Settings","etc"]
break
default:
break
}
self.tableView.reloadData()
}
extension ViewController: UITableViewDelegate,UITableViewDataSource{
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return items.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCell(withIdentifier: "Some ID")
cell?.textLabel?.text = items[indexPath.row]
return cell!
}
}
Try not to change the array from within the cellForRowAt indexPath method using indexPath.row, that will not give you the result you want. Modulate the array from outside the protocol method overrides, and just call the reloadData() method.
Try to use enum of UserType and check type of current user than Make an array with default options available to every user and then append specific data in array according to user type. Hope it clarifies :)
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "Cell") as! MenuTableViewCell
cell.lblTitle.text = items[indexPath.row]
cell.imgMenuLogo.image = image[indexPath.row]
print(User_type)
if User_type == 2{
items.remove(at: 0)
}
return cell
}
This will work, But you have done a small mistake here.
You have removed from array after setting label. So you need to remove the item from array first then do set label.
Btw, I will not recommend this method as you need to add/remove from array for every cellForRowAt method.
I have a multi selected tableview.
what I am doing : when user select items, this items append to the array.
When user deselect the item from cell, this deselected items remove from array.
what I did :
My array : var selectedTagList:[Tag] = []
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.tagTableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
self.selectedTagList.append(tagList![indexPath.row])
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
self.tagTableView.cellForRow(at: indexPath)?.accessoryType = .none
self.selectedTagList.remove(at: indexPath.row)
}
Any advice or sample code please ?
//DataSource and Delegate
extension PickVideoViewController : UITableViewDataSource,UITableViewDelegate {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
guard let tlist = self.tagList , !tlist.isEmpty else { return 1}
return tlist.count
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
guard let tlist = self.tagList , !tlist.isEmpty else {
let cell = UITableViewCell()
cell.selectionStyle = .none
cell.backgroundColor = .clear
cell.textLabel?.textAlignment = .center
cell.textLabel?.textColor = UIColor.black
cell.textLabel?.text = "nodataavaiable".localized()
return cell }
let cell = tableView.dequeueReusableCell(withIdentifier: "TagCell", for: indexPath) as! TagCell
cell.tagName.text = tlist[indexPath.row].tag
cell.accessoryType = cell.isSelected ? .checkmark : .none
cell.selectionStyle = .none // to prevent cells from being "highlighted"
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
self.tagTableView.cellForRow(at: indexPath)?.accessoryType = .checkmark
self.selectedTagList.append(tagList![indexPath.row])
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
self.tagTableView.cellForRow(at: indexPath)?.accessoryType = .none
self.selectedTagList.remove(at: <#T##Int#>)
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
guard let tlist = self.tagList , !tlist.isEmpty else {return tableView.frame.height }
return 40
}
}
self.selectedTagList.remove(at: indexPath.row)
indexPath.row is the wrong value to remove. Since your data source populates based on tagList and not selectedTagList, you need to get the item out of tagList and find the equivalent item in selectedTagList.
You don't show what type of object is in tagList, but you will probably need to make them conform to Equatable so you can do this lookup. Once you do, you should have something like this:
let deselectedTag = self.tagList[indexPath.row]
// You will need the items in `tagList` to conform to `Equatable` to do this
guard let indexOfDeselectedTag = self.selectedTagList.index(of: deselectedTag else) {
// Data inconsistency: the item wasn't found in selectedTagList
return
}
self.selectedTagList.remove(at: indexOfDeselectedTag)
You don't need to maintain a list of selected items. You already have all of the items and the tableView can tell you which rows/items are selected.
https://developer.apple.com/documentation/uikit/uitableview/1614864-indexpathsforselectedrows
Discussion
The value of this property is an array of index-path
objects each identifying a row through its section and row index. The
value of this property is nil if there are no selected rows.
You are trying to reinvent the wheel. Always check the documentation for existing functionality.
If you then want a list of selected items from this you just create an array of the items at those index paths, something like this: (untested)
let selectedItems = tableView.indexPathsForSelectedRows().map {
self.tagList[$0.row]
}
This code will iterate over the index paths and return the item from the array at each one. (this is untested, you may need to use flatMap as you are changing the type)
I have a dynamic tableView with 2 prototype cells. I am using one of the cells for section header, the section header cell has it's own class. Data have been populated to these cells without problems.
I am getting this error message "Error: “Unexpected nil index path in _canPerformAction:forCell:sender:, this should never happen.” at runtime when I tap on the section header. Anyone knows how to get rid of this error? Thanks in advance!
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "MachineTableViewCell") as! MachineTableViewCell
if self.uptime.count == self.machines.count {
cell.GPUNumber.text = self.allGPUNumber[indexPath.section][indexPath.row]
}
return cell
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
guard let header = tableView.dequeueReusableCell(withIdentifier: "header") as? HeaderTableViewCell
else {
return nil
}
let machine = machine[section]
header.name.text = machine.name + " - " + machine.ip + ":" + machine.port
return header
}
func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat
{
return 124
}
I initially missed this as well but if you take a step back and look at the return type you almost kick yourself.
For a regular cell the return type is UITableViewCell.
However for the header it's UIView.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell")...
///
return cell
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
let header = tableView.dequeueReusableCell(withIdentifier: "header")...
///
return header
}
Therefore, what you need to do is return the contentView.
return header.contentView
I have the following code thus far.
var someData = [SomeData]()
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.row == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell1", for: indexPath) as! Cell1
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell2", for: indexPath) as? Cell2
let someData = [indexPath.row]
//Set up labels etc.
return cell!
}
}
I need Cell1 which is a static cell and will always remain at indexPath 0 to be in a section called "Section1" for example & all of the Cell2's to be in a section called "Section2"
Other DataSource & Delegate Methods;
func numberOfSections(in tableView: UITableView) -> Int {
return 2
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 0 {
return 1
} else {
return someData.count
}
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if section == 0 {
return "Section1" }
else {
return "Section2"
}
}
This returns me everything I need for the first section, however, when it comes to the second section (because of the code inside cellForRowAtIndex somewhere) section 2 contains Cell2 at indexPath 0.
Any help greatly appreciated.
Root cause:
In cellForRowAtIndexPath check for indexPath.section instead of indexPath.row
Fix:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
if indexPath.section == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell1", for: indexPath) as! Cell1
return cell
} else {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell2", for: indexPath) as? Cell2
let someData = [indexPath.row]
//Set up labels etc.
return cell!
}
}
I have a tableview with cells that when selected displays an image within the selected cell, this image then disappears when the cell is selected again, and so on. When i press a submit button the selected cells are remembered and the tableview reloads with new data. But when doing this all the new data loads but the selected cell image persists. I have tried calling tableView.reloadData() on the main queue but it still persists. The image also persists when i press the submit button several times.
Heres my code:
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return currentQuestion.answers.count
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return tableView.frame.height/CGFloat(currentQuestion.answers.count)
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
setSelectedArray()
let cell: AnswersTableViewCell = tableView.dequeueReusableCell(withIdentifier: "answersTableViewCell") as! AnswersTableViewCell
let text = currentQuestion.answers[indexPath.row]
let isAnAnswer = currentQuestion.answerKeys[indexPath.row]
cell.answerTextLabel.text = text
cell.answerView.backgroundColor = UIColor.white.withAlphaComponent(0.5)
cell.contentView.sendSubview(toBack: cell.answerView)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if let cell: AnswersTableViewCell = tableView.cellForRow(at: indexPath) as? AnswersTableViewCell {
if cell.answerImageView.image == nil {
cell.answerImageView.image = UIImage(named: "paw.png")
selected[indexPath.row] = true
} else {
cell.answerImageView.image = nil
selected[indexPath.row] = false
}
}
}
#IBAction func submitButtonWasPressed() {
if questionNumber < questions.count - 1 {
questionNumber += 1
setCurrentQuestion()
self.answersTableView.reloadData()
self.view.setNeedsDisplay()
}
}
Any help would be great. Thanks
You need to set the image back to its correct value in cellForRow. Cells in your table are reused between calls to reloadData, and since you're not touching the imageView, it's keeping its previous value. Looks to me like you want:
cell.answerImageView.image = selected[indexPath.row] ? UIImage(named: "paw.png") : nil
inside of tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath).