How to get the indexpath row when an element is activated

Question

I have a tableview with buttons and I want to use the indexpath row when one of them is tapped  This is what I currently have  but it always is 0  var point   Int   func buttonPressed sender  AnyObject        let pointInTable  CGPoint           sender convertPoint sender bounds origin  toView  self tableView      let cellIndexPath   self tableView indexPathForRowAtPoint pointInTable      println cellIndexPath      point   cellIndexPath  row     println point

User · Answer

Since the sender of the event handler is the button itself, I'd use the button's tag property to store the index, initialized in cellForRowAtIndexPath.

But with a little more work I'd do in a completely different way. If you are using a custom cell, this is how I would approach the problem:

add an 'indexPath` property to the custom table cell
initialize it in cellForRowAtIndexPath
move the tap handler from the view controller to the cell implementation
use the delegation pattern to notify the view controller about the tap event, passing the index path

User · Answer

Very Simple getting Index Path swift 4  5 let cell   tableView dequeueReusableCellWithIdentifier  quot Cell quot   as  Cell cell btn tag   indexPath row cell btn addTarget self  action   quot buttonTapped  quot   forControlEvents   UIControlEvents TouchUpInside   How to get IndexPath Inside Btn Click   func buttonTapped   sender  UIButton         print sender tag

User · Answer

giorashc almost had it with his answer  but he overlooked the fact that cell s have an extra contentView layer  Thus  we have to go one layer deeper   guard let cell   sender superview  superview as  YourCellClassHere else       return    or fatalError   or whatever    let indexPath   itemTable indexPath for  cell    This is because within the view hierarchy a tableView has cells as subviews which subsequently have their own  content views  this is why you must get the superview of this content view to get the cell itself  As a result of this  if your button is contained in a subview rather than directly into the cell s content view  you ll have to go however many layers deeper to access it   The above is one such approach  but not necessarily the best approach  Whilst it is functional  it assumes details about a UITableViewCell that Apple have never necessarily documented  such as it s view hierarchy  This could be changed in the future  and the above code may well behave unpredictably as a result   As a result of the above  for longevity and reliability reasons  I recommend adopting another approach  There are many alternatives listed in this thread  and I encourage you to read down  but my personal favourite is as follows   Hold a property of a closure on your cell class  have the button s action method invoke this   class MyCell  UITableViewCell       var button  UIButton       var buttonAction    Any  - gt  Void         objc func buttonPressed sender  Any            self buttonAction  sender            Then  when you create your cell in cellForRowAtIndexPath  you can assign a value to your closure   func tableView   tableView  UITableView  cellForRowAt indexPath  IndexPath  - gt  UITableViewCell       let cell   tableView dequeueReusableCellWithIdentifier  Cell   as  MyCell     cell buttonAction     sender in            Do whatever you want from your button here               OR     cell buttonAction   buttonPressed closure  buttonAction  indexPath  indexPath      lt - Method on the view controller to handle button presses      By moving your handler code here  you can take advantage of the already present indexPath argument  This is a much safer approach that the one listed above as it doesn t rely on undocumented traits

User · Answer

I used convertPoint method to get point from tableview and pass this point to indexPathForRowAtPoint method to get indexPath     IBAction func newsButtonAction sender  UIButton            let buttonPosition   sender convertPoint CGPointZero  toView  self newsTableView          let indexPath   self newsTableView indexPathForRowAtPoint buttonPosition          if indexPath    nil               if indexPath  row    1                  self performSegueWithIdentifier  alertViewController   sender  self

User · Answer

Sometimes button may be inside of another view of UITableViewCell  In that case superview superview may not give the cell object and hence the indexPath will be nil   In that case we should keep finding the superview until we get the cell object   Function to get cell object by superview  func getCellForView view UIView  - gt  UITableViewCell        var superView   view superview      while superView    nil               if superView is UITableViewCell                       return superView as  UITableViewCell                   else                       superView   superView  superview                      return nil     Now we can get indexPath on button tap as below   IBAction func tapButton   sender  UIButton        let cell   getCellForView view  sender      let indexPath   myTabelView indexPath for  cell

User · Answer

In my case i have multiple sections and both the section and row index is vital  so in such a case i just created a property on UIButton which i set the cell indexPath like so   fileprivate struct AssociatedKeys       static var index   0    extension UIButton        var indexPath  IndexPath            get               return objc getAssociatedObject self   amp AssociatedKeys index  as  IndexPath                   set               objc setAssociatedObject self   amp AssociatedKeys index  newValue   OBJC ASSOCIATION RETAIN NONATOMIC                      Then set the property in cellForRowAt like this    func tableView tableView  UITableView  cellForRowAtIndexPath indexPath  NSIndexPath  - gt  UITableViewCell       let cell   tableView dequeueReusableCellWithIdentifier  Cell   as  Cell     cell button indexPath   indexPath     Then in the handleTapAction you can get the indexPath like this     objc func handleTapAction   sender  UIButton        self selectedIndex   sender indexPath

User · Answer

USING A SINGLE TAG FOR ROWS AND SECTIONS There is a simple way to use tags for transmitting the row item AND the section of a TableView CollectionView at the same time  Encode the IndexPath for your UIView tag in cellForRowAtIndexPath   buttonForCell tag   convertIndexPathToTag with  indexPath   Decode the IndexPath from your sender in your target selector       IBAction func touchUpInsideButton sender  UIButton  forEvent event  UIEvent             var indexPathForButton   convertTagToIndexPath from  sender          Encoder and Decoder  func convertIndexPathToTag indexPath  IndexPath  - gt  Int       var tag  Int   indexPath row    1 000 000   indexPath section           return tag    func convertTagToIndexPath from sender  UIButton  - gt  IndexPath       var section  Int   Int  Float sender tag    1 000 000  rounded  down       var row  Int   sender tag -  1 000 000   section       return IndexPath row  row  section  section     Provided that you don   t need more than 4294967296 rows items on a 32bit device  -  e g   42949 sections with 100 000 items rows 4294 sections with 1 000 000 items rows -  like in the example above  429 sections with 10 000 000 items rows     - WARNING  Keep in mind that when deleting or inserting rows items in your TableView CollectionView you have to reload all rows items after your insertion deletion point in order to keep the tag numbers of your buttons in sync with your model     -

User · Answer

Swift 4 and 5 Method 1 using Protocol delegate For example  you have a UITableViewCell with name MyCell class MyCell  UITableViewCell            var delegate MyCellDelegate            IBAction private func myAction   sender  UIButton           delegate didPressButton cell  self           Now create a protocol protocol MyCellDelegate       func didPressButton cell  UITableViewCell     Next step  create an Extension of UITableView extension UITableView       func returnIndexPath cell  UITableViewCell  - gt  IndexPath           guard let indexPath   self indexPath for  cell  else               return nil                   return indexPath          In your UIViewController implement the protocol MyCellDelegate class ViewController  UIViewController  MyCellDelegate             func didPressButton cell  UITableViewCell            if let indexpath   self myTableView returnIndexPath cell  cell                  print indexpath                     Method 2 using closures In UIViewController override func viewDidLoad             super viewDidLoad            using the same  UITableView extension  get the IndexPath here         didPressButton     cell in             if let indexpath   self myTableView returnIndexPath cell  cell                      print indexpath                                  var didPressButton    UITableViewCell  - gt  Void   class MyCell  UITableViewCell         IBAction private func myAction   sender  UIButton           didPressButton self            Note - if you want to get UICollectionView indexPath you can use this UICollectionView extension and repeat the above steps  extension UICollectionView       func returnIndexPath cell  UICollectionViewCell  - gt  IndexPath           guard let indexPath   self indexPath for  cell  else               return nil                   return indexPath

User · Answer

CustomCell swift  protocol CustomCellDelegate       func tapDeleteButton at cell  CustomCell     class CustomCell  UICollectionViewCell            var delegate  CustomCellDelegate           fileprivate let deleteButton  UIButton             let button   UIButton frame   zero          button setImage UIImage named   quot delete quot    for   normal          button addTarget self  action   selector deleteButtonTapped       for   touchUpInside          button translatesAutoresizingMaskIntoConstraints   false         return button                   objc fileprivate func deleteButtonTapped  sender  UIButton            delegate  tapDeleteButton at  self                    ViewController swift  extension ViewController  UICollectionViewDataSource        func collectionView   collectionView  UICollectionView  cellForItemAt indexPath  IndexPath  - gt  UICollectionViewCell           guard let cell   collectionView dequeueReusableCell withReuseIdentifier  customCellIdentifier  for  indexPath  as  CustomCell else               fatalError  quot Unexpected cell instead of CustomCell quot                     cell delegate   self         return cell           extension ViewController  CustomCellDelegate        func tapDeleteButton at cell  CustomCell               Here we get the indexPath of the cell what we tapped on          let indexPath   collectionView indexPath for  cell

User · Answer

My approach to this sort of problem is to use a delegate protocol between the cell and the tableview   This allows you to keep the button handler in the cell subclass  which enables you to assign the touch up action handler to the prototype cell in Interface Builder  while still keeping the button handler logic in the view controller   It also avoids the potentially fragile approach of navigating the view hierarchy or the use of the tag property  which has issues when cells indexes change  as a result of insertion  deletion or reordering   CellSubclass swift  protocol CellSubclassDelegate  class       func buttonTapped cell  CellSubclass     class CellSubclass  UITableViewCell     IBOutlet var someButton  UIButton   weak var delegate  CellSubclassDelegate   override func prepareForReuse         super prepareForReuse       self delegate   nil     IBAction func someButtonTapped sender  UIButton        self delegate  buttonTapped self      ViewController swift  class MyViewController  UIViewController  CellSubclassDelegate         IBOutlet var tableview  UITableView       func tableView tableView  UITableView  cellForRowAtIndexPath indexPath  NSIndexPath  - gt  UITableViewCell            let cell   tableView dequeueReusableCellWithIdentifier  Cell   forIndexPath  indexPath  as  CellSubclass          cell delegate   self             Other cell setup                  MARK  CellSubclassDelegate      func buttonTapped cell  CellSubclass            guard let indexPath   self tableView indexPathForCell cell  else                  Note  this shouldn t happen - how did the user tap on a button that wasn t on screen              return                        Do whatever you need to do with the indexPath          print  Button tapped on row   indexPath row

User · Answer

I found a very easy way to use for manage any cell in tableView and collectionView by using a Model class and this a work as perfectly   There is indeed a much better way to handle this now  This will work for manage cell and value   Here is my output screenshot  so see this      Its very simple to create model class  please follow the below procedure  Create swift class with name RNCheckedModel  write the code as below    class RNCheckedModel  NSObject        var is check   false     var user name                create your cell class   class InviteCell  UITableViewCell         IBOutlet var imgProfileImage  UIImageView       IBOutlet var btnCheck  UIButton       IBOutlet var lblName  UILabel       IBOutlet var lblEmail  UILabel           and finally use model class in your UIViewController when you use your UITableView        class RNInviteVC  UIViewController  UITableViewDelegate  UITableViewDataSource          IBOutlet var inviteTableView  UITableView       IBOutlet var btnInvite  UIButton       var checkArray   NSMutableArray   NSMutableArray       var userName   NSMutableArray   NSMutableArray        override func viewDidLoad             super viewDidLoad           btnInvite layer borderWidth   1 5         btnInvite layer cornerRadius   btnInvite frame height   2         btnInvite layer borderColor    hexColor hex    512DA8   cgColor          var userName1    Olivia   Amelia   Emily   Isla   Ava   Lily   Sophia   Ella   Jessica   Mia   Grace   Evie   Sophie   Poppy   Isabella   Charlotte   Freya   Ruby   Daisy   Alice             self userName removeAllObjects           for items in userName1              print items                let model   RNCheckedModel               model user name   items             model is check   false             self userName add model                          IBAction func btnInviteClick   sender  Any                  func tableView   tableView  UITableView  numberOfRowsInSection         section  Int  - gt  Int           return userName count            func tableView   tableView  UITableView  cellForRowAt indexPath  IndexPath  - gt  UITableViewCell           let cell  InviteCell   inviteTableView dequeueReusableCell withIdentifier   InviteCell   for  indexPath  as  InviteCell          let image   UIImage named   ic unchecked           cell imgProfileImage layer borderWidth   1 0         cell imgProfileImage layer masksToBounds   false         cell imgProfileImage layer borderColor   UIColor white cgColor         cell imgProfileImage layer cornerRadius    cell imgProfileImage frame size width   2         cell imgProfileImage clipsToBounds   true          let model   self userName indexPath row  as  RNCheckedModel         cell lblName text   model user name          if  model is check                cell btnCheck setImage UIImage named   ic checked    for  UIControlState normal                    else               cell btnCheck setImage UIImage named   ic unchecked    for  UIControlState normal                     cell btnCheck tag   indexPath row         cell btnCheck addTarget self  action   selector self btnCheck       for   touchUpInside           cell btnCheck isUserInteractionEnabled   true      return cell             func tableView   tableView  UITableView  heightForRowAt indexPath  IndexPath  - gt  CGFloat           return 80              objc func btnCheck   sender  UIButton             let tag   sender tag         let indexPath   IndexPath row  tag  section  0          let cell  InviteCell   inviteTableView dequeueReusableCell withIdentifier   InviteCell   for  indexPath  as  InviteCell          let model   self userName indexPath row  as  RNCheckedModel          if  model is check                 model is check   false             cell btnCheck setImage UIImage named   ic unchecked    for  UIControlState normal               checkArray remove model user name              if checkArray count  gt  0                   btnInvite setTitle  Invite    checkArray count     for   normal                  print checkArray count                  UIView performWithoutAnimation                       self view layoutIfNeeded                                   else                   btnInvite setTitle  Invite   for   normal                  UIView performWithoutAnimation                       self view layoutIfNeeded                                             else                model is check   true             cell btnCheck setImage UIImage named   ic checked    for  UIControlState normal               checkArray add model user name              if checkArray count  gt  0                   btnInvite setTitle  Invite    checkArray count     for   normal                  UIView performWithoutAnimation                   self view layoutIfNeeded                                   else                    btnInvite setTitle  Invite   for   normal                                   self inviteTableView reloadData              func hexColor hex String  - gt  UIColor           var cString String   hex trimmingCharacters in   whitespacesAndNewlines  uppercased            if  cString hasPrefix                     cString remove at  cString startIndex                     if   cString count     6                return UIColor gray                    var rgbValue UInt32   0         Scanner string  cString  scanHexInt32  amp rgbValue           return UIColor              red  CGFloat  rgbValue  amp  0xFF0000   gt  gt  16    255 0              green  CGFloat  rgbValue  amp  0x00FF00   gt  gt  8    255 0              blue  CGFloat rgbValue  amp  0x0000FF    255 0              alpha  CGFloat 1 0                      override func didReceiveMemoryWarning             super didReceiveMemoryWarning

User · Answer

In Swift 4   just use this   func buttonTapped   sender  UIButton            let buttonPostion   sender convert sender bounds origin  to  tableView           if let indexPath   tableView indexPathForRow at  buttonPostion                let rowIndex    indexPath row

User · Answer

For Swift2 1  I found a way to do it  hopefully  it ll help   let point   tableView convertPoint CGPoint zero  fromView  sender       guard let indexPath   tableView indexPathForRowAtPoint point  else           fatalError  can t find point in tableView

User · Answer

UPDATE  Getting the indexPath of the cell containing the button  both section and row    Using Button Position  Inside of your buttonTapped method  you can grab the button s position  convert it to a coordinate in the tableView  then get the indexPath of the row at that coordinate   func buttonTapped   sender AnyObject        let buttonPosition CGPoint   sender convert CGPoint zero  to self tableView      let indexPath   self tableView indexPathForRow at  buttonPosition      NOTE  Sometimes you can run into an edge case when using the function view convert CGPointZero  to self tableView  results in finding nil for a row at a point  even though there is a tableView cell there  To fix this  try passing a real coordinate that is slightly offset from the origin  such as   let buttonPosition CGPoint   sender convert CGPoint init x  5 0  y  5 0   to self tableView    Previous Answer  Using Tag Property  only returns row   Rather than climbing into the superview trees to grab a pointer to the cell that holds the UIButton  there is a safer  more repeatable technique utilizing the button tag property mentioned by Antonio above  described in this answer  and shown below   In cellForRowAtIndexPath  you set the tag property   button tag   indexPath row button addTarget self  action   buttonClicked    forControlEvents  UIControlEvents TouchUpInside    Then  in the buttonClicked  function  you reference that tag to grab the row of the indexPath where the button is located   func buttonClicked sender UIButton        let buttonRow   sender tag     I prefer this method since I ve found that swinging in the superview trees can be a risky way to design an app  Also  for objective-C I ve used this technique in the past and have been happy with the result

User · Answer

Try using  selector to call the IBaction In the cellforrowatindexpath              cell editButton tag   indexPath row         cell editButton addTarget self  action   selector editButtonPressed   for   touchUpInside    This way you can access the indexpath inside the method editButtonPressed  func editButtonPressed   sender  UIButton     print sender tag   this value will be same as indexpath row

User · Answer

After seeing Paulw11 s suggestion of using a delegate callback  I wanted to elaborate on it slightly put forward another  similar suggestion  Should you not want to use the delegate pattern you can utilise closures in swift as follows   Your cell class   class Cell  UITableViewCell        IBOutlet var button  UIButton       var buttonAction    sender  AnyObject  - gt  Void         IBAction func buttonPressed sender  AnyObject            self buttonAction  sender            Your cellForRowAtIndexPath method   func tableView tableView  UITableView  cellForRowAtIndexPath indexPath  NSIndexPath  - gt  UITableViewCell       let cell   tableView dequeueReusableCellWithIdentifier  Cell   as  Cell     cell buttonAction      sender  in            Do whatever you want from your button here               OR     cell buttonAction   buttonPressed     lt - Method on the view controller to handle button presses

User · Answer

Use an extension to UITableView to fetch the cell that contains any view    Paulw11 s answer of setting up a custom cell type with a delegate property that sends messages to the table view is a good way to go  but it requires a certain amount of work to set up  I think walking the table view cell s view hierarchy looking for the cell is a bad idea  It is fragile - if you later enclose your button in a view for layout purposes  that code is likely to break  Using view tags is also fragile  You have to remember to set up the tags when you create the cell  and if you use that approach in a view controller that uses view tags for another purpose you can have duplicate tag numbers and your code can fail to work as expected  I have created an extension to UITableView that lets you get the indexPath for any view that is contained in a table view cell  It returns an Optional that will be nil if the view passed in actually does not fall within a table view cell  Below is the extension source file in it s entirety  You can simply put this file in your project and then use the included indexPathForView     method to find the indexPath that contains any view         UITableView indexPathForView swift     TableViewExtension        Created by Duncan Champney on 12 23 16      Copyright    2016-2017 Duncan Champney      May be used freely in for any purpose as long as this      copyright notice is included   import UIKit  public extension UITableView              This method returns the indexPath of the cell that contains the specified view        - Parameter view  The view to find         - Returns  The indexPath of the cell containing the view  or nil if it can t be found                 func indexPathForView   view  UIView  - gt  IndexPath            let center   view center         let viewCenter   self convert center  from  view superview          let indexPath   self indexPathForRow at  viewCenter          return indexPath          To use it  you can simply call the method in the IBAction for a button that s contained in a cell  func buttonTapped   button  UIButton      if let indexPath   self tableView indexPathForView button        print  quot Button tapped at indexPath   indexPath  quot         else       print  quot Button indexPath not found quot           Note that the indexPathForView     function will only work if the view object it s passed is contained by a cell that s currently on-screen  That s reasonable  since a view that is not on-screen doesn t actually belong to a specific indexPath  it s likely to be assigned to a different indexPath when it s containing cell is recycled   EDIT  You can download a working demo project that uses the above extension from Github   TableViewExtension git

User · Answer

In Swift 3   Also used guard statements  avoiding a long chain of braces   func buttonTapped sender  UIButton        guard let cellInAction   sender superview as  UITableViewCell else   return       guard let indexPath   tableView  indexPath for  cellInAction  else   return        print indexPath

User · Answer

Extend UITableView to create function that get indexpath for a view  extension UITableView       func indexPath for view  UIView  - gt  IndexPath            self indexPathForRow at  view convert  zero  to  self            How to use  let row   tableView indexPath for  sender   row

User · Answer

Solution  You have a button  myButton  or any other view in cell  Assign tag in cellForRowAt like this cell myButton tag   indexPath row  Now in you tapFunction or any other  Fetch it out like this and save it in a local variable  currentCellNumber    sender view  tag    After this you can use anywhere this currentCellNumber to get the indexPath row of selected button  Enjoy

[ios] How to get the indexpath.row when an element is activated?

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