I am creating a statistics page that displays the number of times an item is used.
Each row has an itemTitle and itemCount.
Not every itemTitle have data (if user does not populate that data, but every row will have itemCount).
I want to hide the empty rows.
Here is what I am trying, but when this is true it hides all rows, not just the individual empty rows.
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: UITableViewCell! = tableView.dequeueReusableCell(withIdentifier: "StatsCell", for: indexPath)
let itemTitle: UILabel = cell.viewWithTag(1000) as! UILabel
let itemCount: UILabel = cell.viewWithTag(1001) as! UILabel
itemTitle.text = self.statsArray[(indexPath as NSIndexPath).row].itemTitle
itemCount.text = "\(self.statsArray[(indexPath as NSIndexPath).row].itemCount)"
if (self.statsArray[(indexPath as NSIndexPath).row].itemTitle).isEmpty {
tableView.rowHeight = 0
}
return cell
}
See the attached example
Thanks
You should implement override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat in your code and return the height as 0 for the row which has an empty array in the datasource. Return the normal height otherwise.
Related
I am using a UITableView and what I am doing is I am changing the color of the cell when I tap on the cell using didSelectRow function of UITableView at cellForRowAt. The thing which is bothering me is when I scroll down or scroll up, those cells whom I changed the color before were changed to other cells. Here is my code:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = myTableView.dequeueReusableCell(withIdentifier: "TasksTableViewCell") as! TasksTableViewCell
cell.backView.backgroundColor = .white
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let cell = myTableView.cellForRow(at: indexPath) as! TasksTableViewCell
cell.backView.backgroundColor = UIColor(named: "primaryViewColor")
}
Does anyone knows why this happens? Does anyone has a solution that when only those cells changes color whom I tap on, and when I scroll down or move up only those cells have the other color?
cellForRowAt will be called every time that cell is displayed.
you need selected list to save selected index.
var listSelected: [Int] = []
and
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "TasksTableViewCell") as! TasksTableViewCell
cell.backView.backgroundColor = listSelected.contains(indexPath.row) ? UIColor(named: "primaryViewColor") : .white
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
if listSelected.contains(indexPath.row) {
listSelected = listSelected.filter{$0 != indexPath.row}
} else {
listSelected.append(indexPath.row)
}
tableView.reloadRows(at: [indexPath], with: .automatic)
}
I encountered do you see the problem many times. Even if using and iVar can solve the problem, You are mixing "Controller" logic and "Model" logic.
I usually prefer to move "selection" state inside the model.
Suppose You have a class "Contact" you use to fill cell data (usual MVC pattern)
I add:
class contact{
..
var selected = false
}
AND in TV delegation method I use to apply selection, OR better I use a custom selection method in a custom cell (for example to see a √ element in cell)
As a bonus multiple selection come for free, and you can also save current selections for next run :)
So as I understand you select a cell and after that other cells look like they are selected?
If so I think this is happening because you change the background color of the cell and tableViews and collectionViews are reusing the cells, basically keeping the background you changed behind.
TableViewCells are reused as soon as they leave the visible area.
This means that a cell whose background you have colored will be deleted from the view hierarchy as soon as it is scrolled up or down. If the corresponding row is scrolled in again, the function cellForRowAt is called again for this IndexPath and the cell gets a white background.
The easiest is to save the IndexPaths of the selected cells and check in the cellForRowAt function if the current cell has to be selected.
Add the following var to the viewController class:
var selectedIndexPaths = Set<IndexPath>()
and modify the tableView delegate methods:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
let cell = myTableView.dequeueReusableCell(withIdentifier: "TasksTableViewCell") as! TasksTableViewCell
cell.backView.backgroundColor = (selectedIndexPaths.contains(indexPath) ? UIColor(named: "primaryViewColor") : .white)
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath)
{
if selectedIndexPaths.contains(indexPath)
{
selectedIndexPaths.remove(indexPath)
}
else
{
selectedIndexPaths.insert(indexPath)
}
tableView.reloadRows(at: [indexPath], with: .none)
}
You can use
step 1: create model
class DemoModel {
var isSelected: Bool = false
var color: UIColor = .While
}
step 2: and in tableview
var listDemo: [DemoModel] = [DemoModel(),...]
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = myTableView.dequeueReusableCell(withIdentifier:
"TasksTableViewCell") as! TasksTableViewCell
var obj = listDemo[indexPath.row]
cell.backView.backgroundColor = obj.color
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
var obj = listDemo[indexPath.row]
obj.color = UIColor(named: "primaryViewColor")
tableView.reloadRows(at: [indexPath], with: .automatic)
}
How to implement two xib cells and only one array, if array count is nil show empty xib cell and if array count is not nil show xib cell with data swift. Please solve the problem i have searched lot of no answer is related to me.
This example assumes your data array is named myData:
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// return either 1, or the count of your data, whichever is greater
return max(1, myData.count)
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
// if it's the first row, and your data is empty
if indexPath.row == 0 && myData.count == 0 {
let cell = tableView.dequeueReusableCell(withIdentifier: "emptyCell", for: indexPath) as! EmptyCell
return cell;
}
let cell = tableView.dequeueReusableCell(withIdentifier: "dataCell", for: indexPath) as! DataCell
// populate the cell
return cell
}
I'm trying to display tableview cells based on items in an array but for some strange reason it will only display the first item in the array. When I use a print statement it shows the array it being iterated through correctly.
Here is the array:
var restaurants = ["Truckyard", "EasySlider", "Revolver", "Armoury"]
Here is the cellForRowAtIndexPath:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = restaurantTableView.dequeueReusableCell(withIdentifier: reuseIdentifier, for: indexPath) as! restaurantCell
for rest in restaurants {
cell.restaurantImageView.image = UIImage(named: rest)
cell.restaurantNameLabel.text = rest
}
return cell
}
cellForIndexPath is called once for each row. Try this instead:
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = restaurantTableView.dequeueReusableCell(withIdentifier: reuseIdentifier, for: indexPath) as! restaurantCell
cell.restaurantImageView.image = UIImage(named: restaurants[indexPath.row])
cell.restaurantNameLabel.text = restaurants[indexPath.row]
return cell
}
No need for a loop. cellForRowAt is providing you with an indexPath. Check the indexPath.row property. If you only have one section, the row is the index of the item in your array you want to access. You are basically iterating over your array for each row and this will inevitably set your last item as the title/image
Requirement :
I have a list of UITableviewCell loaded from a nib that I'm presenting on UITableview. The first time I open the UIViewController all cells are shown correctly and work as expected.
Issue :
If I navigate back to the parent and then open the UIViewController again the UITableviewCell are 'invisible'. I say invisible because with a breakpoint in cellForRowAt I can see that the table view does load all cells and the cells are valid.
Code :
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 13
}
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
return 40
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = (project?.sliderData.sliders[indexPath.row].view)! as UITableViewCell
print(cell.contentView.subviews.count)
if let left = cell.viewWithTag(2) as? UILabel {
left.text = "left"
}
if let middle = cell.viewWithTag(3) as? UILabel {
middle.text = "middle"
}
if let right = cell.viewWithTag(4) as? UILabel {
right.text = "right"
}
return cell
}
Screen Shot Image
Expected observation :
I was thinking that maybe the subviews of the cells get released because I don't have any bindings to them in IB. To test this I'm printing the count of subviews and writing some text to the subview labels. And everything seems to go fine, the cells are loaded and the labels are there but the cells just don't show up.
But then, if I scroll the TableView up and down a little to get some cells updated those cells do appear at the top and bottom of the view as shown in the pic.
You need to call dequeueReusableCell(withIdentifier: "cell") inside your code then will show your table cell. It will reuse cell for your all numbers of row data content.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! UITableViewCell
return cell
}
More Details : How to create uitableview with multiple sections in iOS Swift.
Did not find reason why the tableView behaves the way it does so I solved the issue by dequeueing default cells. The views provided by the slider objects are added as subviews to the dequeued cells. Now the subviews can of course be any UIViews.
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cell = tableView.dequeueReusableCell(withIdentifier: "sliderCell")
if cell == nil {
cell = UITableViewCell.init(style: .default, reuseIdentifier: "sliderCell")
}
cell?.addSubview((project?.sliderData.sliders[indexPath.row].view)!)
return cell!
}
I Have a UITableView which is controlled by NSFetchedResultsController. I want to add single cell to the first row and make this cell static. In other words, there will be a button which will open another View Controller.
Until now, I was ok with fetched results controller and table. Now I'm a bit confused. How should I do this?
Instead using a header might be ok too, but I don't want this header to be on top all the time. I want this cell to be just like WhatsApp iOS "Create new group" cell on chats panel.
Thank you!
var dataArray = ["A","B","C"]
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return self.dataArray.count+1
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell
{
if indexPath.row == 0
{
let cell = tableView.dequeueReusableCell(withIdentifier: "CreateNewGroupCell") as! CreateNewGroupCell
return cell
}
else
{
// Get the data from Array
let data = self.dataArray[indexPath.row-1]
// Logic to show other cells
let cell = tableView.dequeueReusableCell(withIdentifier: "OtherCell") as! OtherCell
return cell
// ....
}
}
You will need to create tableview with number of rows fetched from NSFetchedResultsController +1. Also in cellForRowIndex method you will need to add a check like indexPath.row == 0 and in there you will make the changes.
Also you will have to add action for that button within that section. You can also set different custom tableview for first row.
It can be similar to following:
func tableView(_ tableView: UITableView, cellForRowAtIndexPath indexPath: IndexPath) -> UITableViewCell {
if(indexPath.row==0){
let cell = tableView.dequeueReusableCell(withIdentifier: "CellWithButton", for: indexPath) as! CellWithButton
}
else{
let cell = tableView.dequeueReusableCell(withIdentifier: "OtherCells", for: indexPath) as! OtherCells
//here add data for cells from your array
}
return cell
}