I have a custom class (superclass UITableViewController).
I have an add button that:
Begins table updates.
Inserts row in table.
Ends table updates.
Calls selectRowAtIndexPath.
Calls didSelectRowAtIndexPath.
Unfortunately, didDeselectRowAtIndexPath is not being called after programatically selecting a row.
Note: Using Swift (not Objective-C).
#IBAction func addButton(sender: UIBarButtonItem) {
let indexPathZero: NSIndexPath = NSIndexPath(forRow: 0, inSection: 0)
todoController.addNewTodoItem(nameOfItem: "test5")
self.tableView.beginUpdates()
self.tableView.insertRowsAtIndexPaths([indexPathZero], withRowAnimation: UITableViewRowAnimation.Top)
self.tableView.contentOffset.y = 64
self.tableView.endUpdates()
// Ask user for input
editCell(indexPathZero)
}
func editCell(indexPath: NSIndexPath) {
self.tableView.selectRowAtIndexPath(indexPath, animated: true, scrollPosition: UITableViewScrollPosition.None)
self.tableView(self.tableView, didSelectRowAtIndexPath: indexPath)
}
Solution
let indexPathZero: NSIndexPath = NSIndexPath(forRow: 0, inSection: 0)
todoController.addNewTodoItem(nameOfItem: "test5")
let currSelectedIndexPath = self.tableView.indexPathForSelectedRow()
if currSelectedIndexPath != nil {
self.tableView.deselectRowAtIndexPath(currSelectedIndexPath!, animated: true)
self.tableView(self.tableView, didDeselectRowAtIndexPath: currSelectedIndexPath!)
}
self.tableView.beginUpdates()
self.tableView.insertRowsAtIndexPaths([indexPathZero], withRowAnimation: UITableViewRowAnimation.Top)
self.tableView.contentOffset.y = 64
self.tableView.endUpdates()
// Ask user for input
editCell(indexPathZero)
See the apple docs. When you call selectRowAtIndexPath, it will not call didSelectRowAtIndexPath.
"Calling this method does not cause the delegate to receive a tableView:willSelectRowAtIndexPath: or tableView:didSelectRowAtIndexPath: message, nor does it send UITableViewSelectionDidChangeNotification notifications to observers."
Related
I have written sample code here - when i tap button "Select" it should select all the cells of UICollectionView. But is does not work and no error is reported. Below is code
// collectionView is name of UICollectionView
let collectonViewCount = collectionView.numberOfItemsInSection(0);
for i in 0...collectonViewCount {
let indexPath = NSIndexPath(forRow: i, inSection: 0)
collectionView.selectItemAtIndexPath(indexPath, animated: true, scrollPosition: .None)
}
I'm not sure what could be wrong in the above code.
cybergeeeek,
you can try
for i in 0...collectonViewCount {
let indexPath = NSIndexPath(forRow: i, inSection: 0)
collectionView.delegate?.collectionView!(collectionView, didSelectItemAtIndexPath: indexPath)
}
This answer ofcourse assumes that you have set the collectionView delegate and have implemented didSelectItemAtIndexPath this will select the collectionView cell and will trigger didSelectItemAtIndexPath :)
I have an UITableViewController and I need to select and scroll to one of the cells when the view loads. The reason I need the cell selected rather than just making it look selected (with an accessory or whatever) is that I want it to have a different background and no separators above/below (which is what happens when a table cell is selected), and I want the cell initially visible (if it's too far down).
I've read the two other answers and they don't work or I don't understand them. I'm not sure where I should put the self.tableView.selectRowAtIndexPath and self.scrollToRowAtIndexPath. I tried putting it in viewDidLoad() and it had no effect.
Try to use viewDidAppear
func viewDidAppear(animated: Bool){
super.viewDidAppear(animated)
let path = NSIndexPath(forRow: 1, inSection: 0)
tableView.selectRowAtIndexPath(myPath, animated: false, scrollPosition: UITableViewScrollPosition.None)
}
Swift 4:
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
let path = IndexPath(row: 0, section: 0)
tableView.selectRow(at: path, animated: false, scrollPosition: .none)
}
Use the selectRowAtIndexPath method of UITableView in your view controller's viewDidAppear method
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
// replace forRow: value with the index of the cell
// replace inSection: value with the section the cell is in
let indexPath = NSIndexPath(forRow: 2, inSection: 0)
tableView.selectRowAtIndexPath(indexPath, animated: true, scrollPosition: .Middle)
}
Given solutions didn't work for me. So, here is the solution for swift 5
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
//Choose the row and section
let indexPath = IndexPath(row: 0, section: 0)
tableView.selectRow(at: indexPath, animated: true, scrollPosition: .middle)
tableView.delegate?.tableView!(tableView, didSelectRowAt: indexPath)
}
I have a delegate function that changes a UITableViewCell's section location on tap:
//On cell tap, expand
func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
if indexPath.section == 0
{
let data = firstDataSource[indexPath.row]
tableView.beginUpdates()
secondDataSource.append(data)
firstDataSource.removeAtIndex(indexPath.row)
let newIndexPath = NSIndexPath(forRow: find(secondDataSource, data)!, inSection: 1)
tableView.moveRowAtIndexPath(indexPath, toIndexPath: newIndexPath)
tableView.endUpdates()
} else if indexPath.section == 1 {
let data = secondDataSource[indexPath.row]
tableView.beginUpdates()
firstDataSource.append(data)
secondDataSource.removeAtIndex(indexPath.row)
let newIndexPath = NSIndexPath(forRow: find(firstDataSource, data)!, inSection: 0)
tableView.moveRowAtIndexPath(indexPath, toIndexPath: newIndexPath)
tableView.endUpdates()
}
}
I would like for this action to occur when I fire an IBAction from a button tap, but I'm not sure how I can access the indexPath argument as is given in the delegate function. Here is my current code for the IBAction button:
#IBAction func checkOffTask(sender: UIButton) {
var checkedOff = false
let indexOfCell = sender.tag
sender.setImage(UIImage(named: "checkbox-checked"), forState: UIControlState.Normal)
self.tableView.beginUpdates()
self.tableView.reloadRowsAtIndexPaths([NSIndexPath(forItem: indexOfCell, inSection: 1)], withRowAnimation: UITableViewRowAnimation.Automatic)
self.tableView.endUpdates()
}
Any idea on how to get the delegate function to work for the IBAction function?
Okay, so your action is coming from a button, that button is within a table view cell, the question is: what's the indexPath of that table view cell.
The easiest way is:
get the location of the button within the table view;
ask for the index path at that position.
E.g.
#IBAction func checkOffTask(sender: UIButton!) {
let originInTableView = self.tableView.convertPoint(CGPointZero, fromView: sender)
let indexPath = self.tableView.indexPathForRowAtPoint(originInTableView)
}
Okay, this is a workaround I have used before.
Doesn't look pretty but does the job:
UIButton *likeButton = (UIButton *)sender;
UITableViewCell *cell = (UITableViewCell *)likeButton.superview.superview;
NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
Just find the correct superview for the button which is of UICollectionView Class type.
P.S. - My Swift is not the best. Hoping you can convert this.
I need to select a row in a UITableView programmatically using Swift 1.2.
This is the simple code:
var index = NSIndexPath(forRow: 0, inSection: 0)
self.tableView.selectRowAtIndexPath(index, animated: true, scrollPosition: UITableViewScrollPosition.Middle)
self.tableView(self.tableView, didSelectRowAtIndexPath: index)
The above gives me the following error:
Cannot invoke 'selectRowAtIndexPath' with an argument list of type '(NSIndexPath!, animated: Bool, scrollPosition: UITableViewScrollPosition)'
What is wrong with my Swift 1.2 code?
My UItableView has been created in IB in the UIViewController that I am trying to call the code above.
When I put the code in a UITableViewController the compiler does not give any errors.
Do I need to embed a UITableViewController in a container or is there another way?
Swift 3 to Swift 5 Solution
Selecting a Row
let indexPath = IndexPath(row: 0, section: 0)
myTableView.selectRow(at: indexPath, animated: true, scrollPosition: .bottom)
myTableView.delegate?.tableView!(myTableView, didSelectRowAt: indexPath)
DeSelecting a Row
let deselectIndexPath = IndexPath(row: 7, section: 0)
myTableView.deselectRow(at: deselectIndexPath, animated: true)
myTableView.delegate?.tableView!(myTableView, didDeselectRowAt: indexPath)
The statement
self.tableView.selectRowAtIndexPath(index, animated: true, scrollPosition: UITableViewScrollPosition.Middle)
assumes that tableView is a property of the view controller, connected
to a table view in the Storyboard. A UITableViewController, for example, already has this
property.
In your case, the view controller is a not a table view controller
but a subclass of a UIViewController. It also has an outlet that is
connected to the table view, but it is not called
tableView but menuTable. Then of course you have to call
self.menuTable.selectRowAtIndexPath(index, animated: true, scrollPosition: UITableViewScrollPosition.Middle)
to select a row of that table view.
The strange error messages are caused by the fact that
self.tableView can also be understood by the compiler as a
"curried function" (compare http://oleb.net/blog/2014/07/swift-instance-methods-curried-functions/).
Use below code,after loading your table view with data:
let rowToSelect:NSIndexPath = NSIndexPath(forRow: 0, inSection: 0); //slecting 0th row with 0th section
self.tableView.selectRowAtIndexPath(rowToSelect, animated: true, scrollPosition: UITableViewScrollPosition.None);
now,you have to manually call didSelectRowAtIndexPath: delegate method using below code:
self.tableView(self.tableView, didSelectRowAtIndexPath: rowToSelect); //Manually trigger the row to select
Thanks.
Swift 3.x
if you want to do it at the 'cell-creation', you can do it like this
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = TableViewCell()
let item = items[indexPath.row]
cell.textLabel?.text = item.title
if (item.checked) {
tableView.selectRow(at: indexPath, animated: false, scrollPosition: .none)
}
return cell
}
Using Swift 2.x, as described by Pankaj purohit answers the correct method is:
func tapRowAtIndex(index:Int) {
let rowToSelect:NSIndexPath = NSIndexPath(forRow: index, inSection: 0)
self.tableView.selectRowAtIndexPath(rowToSelect, animated: true, scrollPosition: UITableViewScrollPosition.None)
self.tableView(self.tableView, didSelectRowAtIndexPath: rowToSelect)
}
Keep in mind that if you call this method from an external class for example, you dont know when tableView has finished its loading, so what's the possibilities?, how to workaround this problem? :
Step one: create a class boolean var
var automatingTap: Bool = false
Step two: check when the table finish its loading and launch an "end operations" method:
func tableView(tableView: UITableView, didEndDisplayingCell cell: UITableViewCell, forRowAtIndexPath indexPath: NSIndexPath)
{
let lastRowIndex = tableView.numberOfRowsInSection(0)
if indexPath.row == lastRowIndex - 1 {
endOperations()
}
}
func endOperations()
{
print("finished loading")
if automatingTap {
tapRowAtIndex(0)
automatingTap = false
}
}
Step three: call my tableView class from another class
for example:
override func prepareForSegue(segue: UIStoryboardSegue?, sender: AnyObject?) {
if segue!.identifier == "DetailsTableView" {
let viewController:ViewController = segue!.destinationViewController as ViewController
viewController.automatingTap = true
}
}
Reusable function with validation of table size
Swift 4 and 5
This reusable function works and validate the size of table.
func selectRow(tableView: UITableView, position: Int) {
let sizeTable = tableView.numberOfRows(inSection: 0)
guard position >= 0 && position < sizeTable else { return }
let indexPath = IndexPath(row: position, section: 0)
tableView.selectRow(at: indexPath, animated: true, scrollPosition: .middle)
}
you can use it in this way
selectRow(tableView: myTableView, position: pos)
or you can implement this extension:
extension UITableView {
func selectRow(row: Int, section: Int = 0) {
let sizeTable = self.numberOfRows(inSection: section)
guard row >= 0 && row < sizeTable else { return }
let indexPath = IndexPath(row: row, section: section)
self.selectRow(at: indexPath, animated: true, scrollPosition: .middle)
}
}
and you can use it in this way:
mytableView.selectRow(row: pos, section: 0)
or
mytableView.selectRow(row: pos)
Swift 4.2:
Select one or more Rows
let ndx:IndexSet = [1]
// or: let ndx:IndexSet = [1, 2, 3]; // etc
tableview?.selectRowIndexes(ndx, byExtendingSelection: false);
Deselect a Single Row
tableview?.deselectRow(current)
Note that if you have (func tableViewSelectionDidChange(...)) implemented, that will be triggered by the above.
Also see Charlton Provatas' answer at https://stackoverflow.com/a/48696458/352920 for an extension to NSTableView, that provides a simple
tableview?.selectRow(at:)
I have a button in my custom cell that deletes the cell.
So i have a delegate that removes it.
code in view controller:
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("swipeTableViewCell", forIndexPath: indexPath) as! swipeTableViewCell
cell.initCell(self, indexPath: indexPath, text: data[indexPath.row])
return cell
}
delegate method:
func removeCell(indexPath: NSIndexPath){
data.removeAtIndex(indexPath.row)
table.beginUpdates()
table.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
table.endUpdates()
}
code in cell:
func initCell(handler: handleCells, indexPath: NSIndexPath, text: String) {
self.handler = handler
self.indexPath = indexPath
}
button pressed:
#IBAction func OnDelButtonClickListener(sender: UIButton) {
self.handler.removeCell(indexPath)
}
This removes the cell with animation but the reloadData is not called and then the cells have the wrong indexPath.
So when I press a second cells delete the wrong cell gets removed.
If I call reloadData after table.endUpdates() there is no animation.
if I call
let indexSet = NSIndexSet(index: indexPath.section)
self.table.reloadSections(indexSet, withRowAnimation: UITableViewRowAnimation.Automatic)
instead of
table.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
I don't get a removal animation.
Any suggestions?
Thanks
Have a look at Apple's programming guide for UITableViews, at the row deleting section.
I may be missing something in your code, but it looks like you don't actually delete the object in the datasource that corresponds to your deleted cell. Try removing the object from your datasource in the removeCell function before you delete the row.
func removeCell(indexPath: NSIndexPath){
// here you delete the object form the datasource
// after that, you do this
table.beginUpdates()
table.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
table.endUpdates()
}
I think the key problem is in the Cell indexPath could not update when the table view delete the cell.
so we can try create a help array in the ViewController,help us update the really data to delate.
lazy var listHelper:Array<Int> = {
var array = [Int]()
for i in 0...self.data.count {
array.append(i)
}
return array
}()
update the removeCell function to this :
func removeCell(indexPath: NSIndexPath) {
// if first delete delete the date, and remove index in help list
if indexPath.row < listHelper.count - 1 && indexPath.row == listHelper[indexPath.row] {
data.removeAtIndex(indexPath.row)
tableView.beginUpdates()
tableView.deleteRowsAtIndexPaths([indexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
tableView.endUpdates()
listHelper.removeAtIndex(indexPath.row)
}else {
// if indexPath.row != listHelper[indexPath.row],we find the really data we want to delete, used Array extension .indexOf
let locationData = listHelper.indexOf(indexPath.row)
data.removeAtIndex(locationData!)
// we create NSIndexPath and delete it.
let theindexPath = NSIndexPath(forRow: locationData!, inSection: 0)
tableView.beginUpdates()
tableView.deleteRowsAtIndexPaths([theindexPath], withRowAnimation: UITableViewRowAnimation.Automatic)
tableView.endUpdates()
listHelper.removeAtIndex(locationData!)
}
}
the Extension of Array :
extension Array {
func indexOf <U: Equatable> (item: U) -> Int? {
if item is Element {
return Swift.find(unsafeBitCast(self, [U].self), item)
}
return nil
}
}
My English is poor. and U can see the code . I had try it, and it can work. I hope can solve you problem.