I have a working UITableview which currently allows multiple Cells to be selected. I would like just one to be selected and if a previous one was chosen then the new selection should uncheck the previous one. Mind bender! Here is my code:
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
let indexPath = tableView.indexPathForSelectedRow();
let CurrentCell = tableView.cellForRowAtIndexPath(indexPath!) as UITableViewCell!;
if CurrentCell.imageView!.image == nil {
let SelectedCell = CurrentCell.textLabel!.text
CurrentCell.imageView!.image = UIImage(named:"check")!
CurrentCell.textLabel!.font = UIFont(name:"OpenSans-Bold", size:15)
println("Selected Cell is")
println(SelectedCell)
} else {
CurrentCell.imageView!.image = nil
let SelectedCell = "NothingSelected"
CurrentCell.textLabel!.font = UIFont(name:"OpenSans-Regular", size:15)
println("Nothing Selected")
}
}
A very effective way to manage the selection state is to add a selected property to the data model, in this example just called Model
class Model {
var selected = false
...
}
In the UITableViewController class we assume there is an Array data which holds the Model items as the data source for the table view.
var data = [Model]()
In cellForRowAtIndexPath set the image and text depending on the selected property:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("MyIdentifier") as! UITableViewCell
let currentItem = data[indexPath.row]
if currentItem.selected {
cell.imageView!.image = UIImage(named:"check")!
cell.textLabel!.font = UIFont(name:"OpenSans-Bold", size:15)
} else {
cell.imageView!.image = nil
cell.textLabel!.font = UIFont(name:"OpenSans-Regular", size:15)
}
return cell
}
In didSelectRowAtIndexPath set the property selected of the currently selected cells to false, set the property selected of the just selected cell to true and reload the table, the changes are applied in cellForRowAtIndexPath
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
data.filter {$0.selected == true}.map {$0.selected = false}
let currentItem = data[indexPath.row]
currentItem.selected = true
tableView.reloadData()
}
you can create your instance var to keep your selection index
and then in your cellForINdexPath method check if the current cell is equals to it:
that was discussed here:
How to uncheck all rows using UITableViewCellAccessoryCheckmark
Related
I have a tableview and in each cell there is a checkbox. I also have a "select all" button.
My problem is that when I click select all I want to update all the checkboxes to checked state. So from a list of 100 cells, all get checked but every 13th cell does not. To make it clearer, on my simulators screen are 12 cells visible that all get checked. When I start scrolling, the first cell that comes up is unchecked, and is then followed by 12 checked ones :S
When I scroll a little and click "select all" again, the skipped ones become also checked..
Anyone have a clue what am I missing?
This is the cell code:
class ListTableViewCell: UITableViewCell {
#IBOutlet weak var checkbox: UIButton!
var buttonState = false{
didSet{
if buttonState{
checkbox.setImage(#imageLiteral(resourceName: "checked"), for: .normal)
}else{
checkbox.setImage(#imageLiteral(resourceName: "unchecked"), for: .normal)
}
}
}
#IBAction func checkboxAction(_ sender: UIButton) {
if buttonState {
buttonState = false
}else{
buttonState = true
}
}
func simulateCheck(){
buttonState = true
}
And here are some snipets from my controller:
private var articleValues: [ArticleValue] = []{
didSet{
tableView.reloadData()
}
}
func selectAll(){
for i in 0..<articleValues.count{
let cell = tableView.cellForRow(at: IndexPath(item: i, section: 0)) as? ListTableViewCell
cell?.simulateCheck()
tableView.reloadData()
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "articleValueItem", for: indexPath)
// Cell Configuration
let articleValue = articleValues[indexPath.row]
if let articleValueCell = cell as? ListTableViewCell{
articleValueCell.articleValue = articleValue
}
return cell
}
Your UITableView is backed by a data source. This means that you shouldn't change cells directly like you do here:
cell?.simulateCheck()
tableView.reloadData()
Instead you should keep a list of all the checked positions, maybe another array that has bools for each corresponding articleValue (this is not the best design).
var checkedValues = Bool
In your
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell method you would then set the state of the cell:
articleValueCell.buttonState = checkedValues[indexPath.row]
In your selectAll method fill this array with true values and then call tableView.reloadData()
private var checkedValues = [Bool]()
private var articleValues: [ArticleValue] = []{
didSet{
checkedValues = Array(repeating: false, count: articleValues.count)
tableView.reloadData()
}
}
func selectAll(){
checkedValues = Array(repeating: true, count: articleValues.count)
tableView.reloadData()
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "articleValueItem", for: indexPath)
// Cell Configuration
let articleValue = articleValues[indexPath.row]
if let articleValueCell = cell as? ListTableViewCell{
articleValueCell.articleValue = articleValue
articleValueCell.buttonState = checkedValues[indexPath.row]
}
return cell
}
Another mistake is that you should never iterate on all the cells in the table because they are reused, no point in going through your data source and getting a cell for each. It only makes sense to iterate through tableView.visibleCells. But like in your case, most of the time you don't need that either, you should just update your data source accordingly and reload the table or just the modified cell.
It's not recommended that you refer to cells directly within a table view. The reason is that UITableViews have an efficient method of only loading the cells as they are needed (and deallocating them when they are no longer needed, e.g. the cell scrolls off screen). Because of this the cell you are try to refer to may not be loaded.
Instead you should interact with it via the cellForRowAt method. If you want to "select all" cells, you should create a property that stores the value of checked or not checked via a Bool and then set all of the ArticleValue elements to true for that property and reload the data inside selectAll().
It could work something like this:
func selectAll() {
articleValues.forEach {
$0.checked = true
}
tableView.reloadData()
}
// ...
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "articleValueItem", for: indexPath)
// Cell Configuration
let articleValue = articleValues[indexPath.row]
if let articleValueCell = cell as? ListTableViewCell{
articleValueCell.articleValue = articleValue
if articleValue.checked {
articleValueCell.simulateCheck()
}
}
return cell
}
I have a tableViewCell that uses a checkmark in accessoryType of cell. I have a function that puts the contents of the cell into textField and similarly removes the text from the text field when it is unchecked.
It seems to work fine but if I check a cell and want to check a cell thats not visible (IOW) I need to scroll the tableView, the cell that was checked (is now not visible) seems to uncheck itself (Only when I check a new visible cell).
The multi select works with visible cells only.
Here is my code:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath)
let row = indexPath.row
cell.textLabel?.text = painArea[row]
cell.accessoryType = .None
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
//selectedRow = indexPath
tableView.deselectRowAtIndexPath(indexPath, animated: true)
let row = indexPath.row
let cell = tableView.cellForRowAtIndexPath(indexPath)
if cell!.accessoryType == .Checkmark {
cell!.accessoryType = .None
} else {
cell!.accessoryType = .Checkmark
}
populateDescription()
print(painArea[row])
}
var painDescription = ["very sore"]
func populateDescription() {
painDescription.removeAll()
severityText.text = ""
for cell in tableView.visibleCells {
if cell.accessoryType == .Checkmark {
painDescription.append((cell.textLabel?.text)! + " ")
}
var painArea = ""
var i = 1
while i <= painDescription.count {
painArea += painDescription[i-1] + "~"
i = i + 1
}
severityText.text = painArea
}
I hope I am explaining myself adequately. I don't want the non visible cells to be unchecked and thus removed from my text field unless I uncheck it.
Any ideas would be most appreciated.
Kind regards
Wayne
It is happing because of reusability of Cell. Instead of setting Checkmark in didSelect try to set in the cellForRowAtIndexPath. Also you need to create model class like this to solve your problem
class ModelClass: NSObject {
var isSelected: Bool = false
//Declare other property that you are using cellForRowAtIndexPath
}
Now check this isSelected in cellForRowAtIndexPath like below.
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(textCellIdentifier, forIndexPath: indexPath)
let row = indexPath.row
let modelClass = painArea[row]
cell.textLabel?.text = modelClass.name
if modelClass.isSelected {
cell.accessoryType = .Checkmark
}
else {
cell.accessoryType = .None
}
return cell
}
Now change your didSelect like this
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
var modelClass = painArea[indexPath.row]
modelClass.isSelected = !modelClass.isSelected
self.tableView.reloadData()
populateDescription()
print(painArea[row])
}
Hope this will help you.
It's because whenever u scroll the cell out of view and scroll back, it will call the cellForRow again and set everything back to default, what you have to do is create a properly dataSource, whenever a cell got checked, you update the dataSource with a Bool indicate it has been checked, then set it back in the cellForRow or cellWillDisplay
I have a tableView with list of persons. I want to select multiple cells. I've created a dictionary to store selected cells (screenshot).
var checkedSubjects: [Person: Bool] = [Person: Bool]()
Then when I select a cell it shows a checkmark near the cell and save it in my array (screenshot).
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell: SearchTableViewCell = tableView.dequeueReusableCellWithIdentifier("CELL", forIndexPath: indexPath) as! SearchTableViewCell
cell.tintColor = UIColor(hex: 0x3f51b5)
cell.subjectNameLabel.text = subjects[indexPath.row].name
cell.subjectDescriptionLabel.text = "(\(subjects[indexPath.row].type))"
let person = Person(id: subjects[indexPath.row].id, name: subjects[indexPath.row].name, type: subjects[indexPath.row].type)
if checkedSubjects[person] != nil {
cell.accessoryType = checkedSubjects[person]! ? .Checkmark : .None
}
return cell
}
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
tableView.deselectRowAtIndexPath(indexPath, animated: false)
let index = indexPath.row
let person = Person(id: subjects[index].id, name: subjects[index].name, type: subjects[index].type)
if tableView.cellForRowAtIndexPath(indexPath)!.accessoryType == .Checkmark {
tableView.cellForRowAtIndexPath(indexPath)!.accessoryType = .None
checkedSubjects[person] = false
counter--
} else {
tableView.cellForRowAtIndexPath(indexPath)!.accessoryType = .Checkmark
checkedSubjects[person] = true
counter++
}
if counter > 0 {
saveBtn.enabled = true
let text = counter == 1 ? "Add \(counter) person" : "Add \(counter) persons"
saveBtn.setTitle(text, forState: UIControlState.Normal)
} else {
saveBtn.enabled = false
saveBtn.setTitle("Choose persons", forState: UIControlState.Normal)
}
}
But when I press this cell one more time I want it to return to default view. It removes checkmark but the text doesn't take empty space (screenshot). The trailing constraint of the label is set to container margin.
I've tried to reloadData() of tableView in didSelectRowAtIndexPath but it doesn't helped.
Any ideas how I can solve this issue?
I think the problem here is that you're trying to manipulate the physical cell in your didSelectRow implementation. This is the wrong way to go about things. Do not attempt to change or even read the accessory type of a cell in your didSelectRow implementation! Instead, operate there entirely on the model (checkedSubjects) and reload the affected row, so that the view picks up changes to the model (because cellForRow will be called).
I have a UITableView in my ViewController.
One of the cell could be tap into another TableViewController to allow select a value.
I want to update my cell after back from the callee ViewController.
right now, i could pass back the selected value by delegate.
However, i tried following way, none of them works.
self.mainTable.reloadData()
dispatch_async(dispatch_get_main_queue()) {
self.mainTable.reloadData()
}
self.mainTable.beginUpdates()
self.mainTable.reloadRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.None)
self.mainTable.endUpdates()
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
was called and executed without error.
but the UI just doesn't change
here is the way I update value in cellForRowAtIndexPath
if let currentCell = tableView.cellForRowAtIndexPath(indexPath) as UITableViewCell! {
currentCell.textLabel?.text = address
return currentCell
}
Here is my cellForRowAtIndexPath -
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let id = "Cell"
println(indexPath)
if indexPath.row == 1 {
var cell = tableView.dequeueReusableCellWithIdentifier(id) as? UITableViewCell
if cell == nil {
cell = UITableViewCell(style: UITableViewCellStyle.Default, reuseIdentifier: id)
cell?.contentMode = UIViewContentMode.Center
cell?.selectionStyle = UITableViewCellSelectionStyle.None
cell?.contentView.addSubview(mapView!)
}
return cell!
}else{
let cell = UITableViewCell()
cell.textLabel?.text = self.address
return cell
}
}
Here is the delegate method -
func passBackSelectedAddress(address: String) {
self.address = address
var indexPath = NSIndexPath(forRow: 0, inSection: 0)
self.mainTable.beginUpdates()
self.mainTable.reloadRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
self.mainTable.endUpdates()
}
My fix:
After more debug, i find the cause,
the self.address value is updated in delegate, however it roll back to previous value in cellForRowAtIndexPath.
I change the property to a static property, then resolve the problem.
I'm not sure what's wrong with instance property, and why it reverses back.
static var _address:String = ""
It seems like you're trying to grab a cell from the UITableView and then update the textLabel value that way. However, UITableView and UITableViewCell are not meant to be updated in this way. Instead, store the value of address in your class and update this value when the delegate calls back into your class. If cellForRowAtIndexPath constructs the UITableViewCell with the value of self.address, calling mainTable.reloadData() after should update the cell to the new value.
For example:
var address: String
func delegateCompleted(address: String) {
self.address = address
self.mainTable.reloadData()
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(<your identifier>)
if (indexPath == <your address cell indexPath>) {
let textLabel = <get your textLabel from the cell>
textLabel?.text = self.address
}
return cell
}
Your cellForRowAtIndexPath has some problems -
You are using the same re-use identifier for different types of cell (one with a map, one without)
When you allocate the table view cell for the other row, you don't include the re-use identifier.
You have no way of referring to the map view that you are adding after the method exits because you don't keep a reference.
If you are using a storyboard then you should create the appropriate prototype cells and subclass(es) and assign the relevant cell reuse ids. If you aren't then I suggest you create a cell subclass and register the classes against the reuse identifiers. Your cellForRowAtIndexPath will then look something like -
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var returnCell:UITableViewCell
if indexPath.row == 1 {
var myMapCell = tableView.dequeueReusableCellWithIdentifier("mapCell", forIndexPath:indexPath) as MYMapCell
myMapCell.contentMode = UIViewContentMode.Center
myMapCell.selectionStyle = UITableViewCellSelectionStyle.None
// Set the properties for a map view in the cell rather than assigning adding an existing map view
returnCell=myMapCell
}else{
returnCell = tableView.dequeueReusableCellWithIdentifier("addressCell", forIndexPath:indexPath)
returnCell.textLabel?.text = self.address
}
return returnCell;
}
I have been trying to implement a feature in my app so that when a user taps a cell in my table view, the cell expands downwards to reveal notes. I have found plenty of examples of this in Objective-C but I am yet to find any for Swift.
This example seems perfect: Accordion table cell - How to dynamically expand/contract uitableviewcell?
I had an attempt at translating it to Swift:
var selectedRowIndex = NSIndexPath()
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
selectedRowIndex = indexPath
tableView.beginUpdates()
tableView.endUpdates()
}
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
if selectedRowIndex == selectedRowIndex.row && indexPath.row == selectedRowIndex.row {
return 100
}
return 70
}
However this just seems to crash the app.
Any ideas?
Edit:
Here is my cellForRowAtIndexPath code:
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
var cell:CustomTransactionTableViewCell = self.tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as CustomTransactionTableViewCell
cell.selectionStyle = UITableViewCellSelectionStyle.None
if tableView == self.searchDisplayController?.searchResultsTableView {
cell.paymentNameLabel.text = (searchResults.objectAtIndex(indexPath.row)) as? String
//println(searchResults.objectAtIndex(indexPath.row))
var indexValue = names.indexOfObject(searchResults.objectAtIndex(indexPath.row))
cell.costLabel.text = (values.objectAtIndex(indexValue)) as? String
cell.dateLabel.text = (dates.objectAtIndex(indexValue)) as? String
if images.objectAtIndex(indexValue) as NSObject == 0 {
cell.paymentArrowImage.hidden = false
cell.creditArrowImage.hidden = true
} else if images.objectAtIndex(indexValue) as NSObject == 1 {
cell.creditArrowImage.hidden = false
cell.paymentArrowImage.hidden = true
}
} else {
cell.paymentNameLabel.text = (names.objectAtIndex(indexPath.row)) as? String
cell.costLabel.text = (values.objectAtIndex(indexPath.row)) as? String
cell.dateLabel.text = (dates.objectAtIndex(indexPath.row)) as? String
if images.objectAtIndex(indexPath.row) as NSObject == 0 {
cell.paymentArrowImage.hidden = false
cell.creditArrowImage.hidden = true
} else if images.objectAtIndex(indexPath.row) as NSObject == 1 {
cell.creditArrowImage.hidden = false
cell.paymentArrowImage.hidden = true
}
}
return cell
}
Here are the outlet settings:
It took me quite a lot of hours to get this to work. Below is how I solved it.
PS: the problem with #rdelmar's code is that he assumes you only have one section in your table, so he's only comparing the indexPath.row. If you have more than one section (or if you want to already account for expanding the code later) you should compare the whole index, like so:
1) You need a variable to tell which row is selected. I see you already did that, but you'll need to return the variable to a consistent "nothing selected" state (for when the user closes all cells). I believe the best way to do this is via an optional:
var selectedIndexPath: NSIndexPath? = nil
2) You need to identify when the user selects a cell. didSelectRowAtIndexPath is the obvious choice. You need to account for three possible outcomes:
the user is tapping on a cell and another cell is expanded
the user is tapping on a cell and no cell is expanded
the user is tapping on a cell that is already expanded
For each case we check if the selectedIndexPath is equal to nil (no cell expanded), equal to the indexPath of the tapped row (same cell already expanded) or different from the indexPath (another cell is expanded). We adjust the selectedIndexPath accordingly. This variable will be used to check the right rowHeight for each row. You mentioned in comments that didSelectRowAtIndexPath "didn't seem to be called". Are you using a println() and checking the console to see if it was called? I included one in the code below.
PS: this doesn't work using tableView.rowHeight because, apparently, rowHeight is checked only once by Swift before updating ALL rows in the tableView.
Last but not least, I use reloadRowsAtIndexPath to reload only the needed rows. But, also, because I know it will redraw the table, relayout when necessary and even animate the changes. Note the [indexPath] is between brackets because this method asks for an Array of NSIndexPath:
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
println("didSelectRowAtIndexPath was called")
var cell = tableView.cellForRowAtIndexPath(indexPath) as! MyCustomTableViewCell
switch selectedIndexPath {
case nil:
selectedIndexPath = indexPath
default:
if selectedIndexPath! == indexPath {
selectedIndexPath = nil
} else {
selectedIndexPath = indexPath
}
}
tableView.reloadRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
}
3) Third and final step, Swift needs to know when to pass each value to the cell height. We do a similar check here, with if/else. I know you can made the code much shorter, but I'm typing everything out so other people can understand it easily, too:
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
let smallHeight: CGFloat = 70.0
let expandedHeight: CGFloat = 100.0
let ip = indexPath
if selectedIndexPath != nil {
if ip == selectedIndexPath! {
return expandedHeight
} else {
return smallHeight
}
} else {
return smallHeight
}
}
Now, some notes on your code which might be the cause of your problems, if the above doesn't solve it:
var cell:CustomTransactionTableViewCell = self.tableView.dequeueReusableCellWithIdentifier("Cell", forIndexPath: indexPath) as CustomTransactionTableViewCell
I don't know if that's the problem, but self shouldn't be necessary, since you're probably putting this code in your (Custom)TableViewController. Also, instead of specifying your variable type, you can trust Swift's inference if you correctly force-cast the cell from the dequeue. That force casting is the as! in the code below:
var cell = tableView.dequeueReusableCellWithIdentifier("CellIdentifier" forIndexPath: indexPath) as! CustomTransactionTableViewCell
However, you ABSOLUTELY need to set that identifier. Go to your storyboard, select the tableView that has the cell you need, for the subclass of TableViewCell you need (probably CustomTransactionTableViewCell, in your case). Now select the cell in the TableView (check that you selected the right element. It's best to open the document outline via Editor > Show Document Outline). With the cell selected, go to the Attributes Inspector on the right and type in the Identifier name.
You can also try commenting out the cell.selectionStyle = UITableViewCellSelectionStyle.None to check if that's blocking the selection in any way (this way the cells will change color when tapped if they become selected).
Good Luck, mate.
The first comparison in your if statement can never be true because you're comparing an indexPath to an integer. You should also initialize the selectedRowIndex variable with a row value that can't be in the table, like -1, so nothing will be expanded when the table first loads.
var selectedRowIndex: NSIndexPath = NSIndexPath(forRow: -1, inSection: 0)
override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
if indexPath.row == selectedRowIndex.row {
return 100
}
return 70
}
Swift 4.2 var selectedRowIndex: NSIndexPath = NSIndexPath(row: -1, section: 0)
I suggest solving this with modyfing height layout constraint
class ExpandableCell: UITableViewCell {
#IBOutlet weak var img: UIImageView!
#IBOutlet weak var imgHeightConstraint: NSLayoutConstraint!
var isExpanded:Bool = false
{
didSet
{
if !isExpanded {
self.imgHeightConstraint.constant = 0.0
} else {
self.imgHeightConstraint.constant = 128.0
}
}
}
}
Then, inside ViewController:
class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
#IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
self.tableView.estimatedRowHeight = 2.0
self.tableView.rowHeight = UITableViewAutomaticDimension
self.tableView.tableFooterView = UIView()
}
// TableView DataSource methods
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 3
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell:ExpandableCell = tableView.dequeueReusableCell(withIdentifier: "ExpandableCell") as! ExpandableCell
cell.img.image = UIImage(named: indexPath.row.description)
cell.isExpanded = false
return cell
}
// TableView Delegate methods
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
guard let cell = tableView.cellForRow(at: indexPath) as? ExpandableCell
else { return }
UIView.animate(withDuration: 0.3, animations: {
tableView.beginUpdates()
cell.isExpanded = !cell.isExpanded
tableView.scrollToRow(at: indexPath, at: UITableViewScrollPosition.top, animated: true)
tableView.endUpdates()
})
}
func tableView(_ tableView: UITableView, didDeselectRowAt indexPath: IndexPath) {
guard let cell = tableView.cellForRow(at: indexPath) as? ExpandableCell
else { return }
UIView.animate(withDuration: 0.3, animations: {
tableView.beginUpdates()
cell.isExpanded = false
tableView.endUpdates()
})
}
}
Full tutorial available here
A different approach would be to push a new view controller within the navigation stack and use the transition for the expanding effect. The benefits would be SoC (separation of concerns). Example Swift 2.0 projects for both patterns.
https://github.com/justinmfischer/SwiftyExpandingCells
https://github.com/justinmfischer/SwiftyAccordionCells
After getting the index path in didSelectRowAtIndexPath just reload the cell with following method
reloadCellsAtIndexpath
and in heightForRowAtIndexPathMethod check following condition
if selectedIndexPath != nil && selectedIndexPath == indexPath {
return yourExpandedCellHieght
}