Assertion failure in dequeueReusableCellWithIdentifier forIndexPath

Question

So I was making an rss reader for my school and finished the code  I ran the test and it gave me that error  Here is the code it s referring to   -  UITableViewCell   tableView  UITableView   tableView           cellForRowAtIndexPath  NSIndexPath   indexPath       static NSString  CellIdentifier     Cell       UITableViewCell  cell          tableView dequeueReusableCellWithIdentifier CellIdentifier                                       forIndexPath indexPath       if  cell    nil             cell               UITableViewCell alloc  initWithStyle UITableViewCellStyleSubtitle                                   reuseIdentifier CellIdentifier            here s the error in the output      2012-10-04 20 13 05 356 Reader 4390 c07    Assertion failure in   - UITableView dequeueReusableCellWithIdentifier forIndexPath     SourceCache UIKit Sim UIKit-2372 UITableView m 4460 2012-10-04   20 13 05 357 Reader 4390 c07    Terminating app due to uncaught   exception  NSInternalInconsistencyException   reason   unable to   dequeue a cell with identifier Cell - must register a nib or a class   for the identifier or connect a prototype cell in a storyboard      First throw call stack   0x1c91012 0x10cee7e 0x1c90e78 0xb64f35 0xc7d14 0x39ff 0xd0f4b 0xd101f 0xb980b 0xca19b 0x6692d 0x10e26b0   0x228dfc0 0x228233c 0x228deaf 0x1058cd 0x4e1a6 0x4ccbf 0x4cbd9 0x4be34   0x4bc6e 0x4ca29 0x4f922 0xf9fec 0x46bc4 0x47311 0x2cf3 0x137b7 0x13da7   0x14fab 0x26315 0x2724b 0x18cf8 0x1becdf9 0x1becad0 0x1c06bf5   0x1c06962 0x1c37bb6 0x1c36f44 0x1c36e1b 0x147da 0x1665c 0x2a02 0x2935    libc  abi dylib  terminate called throwing an exception   and here s the code it shows in the error screen   int main int argc  char  argv           autoreleasepool           return UIApplicationMain argc  argv  nil  NSStringFromClass  AppDelegate class               please help

User · Answer

I setup everything correctly in the Storyboard and did a clean build but kept getting the error " must register a nib or a class for the identifier or connect a prototype cell in a storyboard"

[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"Cell"];

Corrected the error but i'm still at a loss. I'm not using a 'custom cell', just a view with a tableview embeded. I have declared the viewcontroller as delegate and datasource and made sure the cell identifier matches in file. whats going on here?

User · Answer

The problem is most likely because you config custom UITableViewCell in storyboard but you do not use storyboard to instantiate your UITableViewController which uses this UITableViewCell  For example  in MainStoryboard  you have a UITableViewController subclass called MyTableViewController and have a custom dynamic UITableViewCell called MyTableViewCell with identifier id  MyCell     If you create your custom UITableViewController like this    MyTableViewController  myTableViewController     MyTableViewController alloc  init     It will not automatically register your custom tableviewcell for you  You have to manually register it   But if you use storyboard to instantiate MyTableViewController  like this   UIStoryboard  storyboard    UIStoryboard storyboardWithName   MainStoryboard  bundle nil   MyTableViewController  myTableViewController    storyboard  instantiateViewControllerWithIdentifier   MyTableViewController      Nice thing happens  UITableViewController will automatically register your custom tableview cell that you define in storyboard for you   In your delegate method  cellForRowAtIndexPath   you can create you table view cell like this    -  UITableViewCell   tableView  UITableView   tableView cellForRowAtIndexPath  NSIndexPath   indexPath   static NSString  CellIdentifier     MyCell   UITableViewCell  cell    tableView dequeueReusableCellWithIdentifier CellIdentifier forIndexPath indexPath      Configure your cell here      return cell      dequeueReusableCellWithIdentifier will automatically create new cell for you if there is not reusable cell available in the recycling queue   Then you are done

User · Answer

If you are going with Custom Static Cells just comment this method      -  UITableViewCell   tableView  UITableView   tableView cellForRowAtIndexPath  NSIndexPath   indexPath        static NSString  CellIdentifier     notificationCell         UITableViewCell  cell    tableView dequeueReusableCellWithIdentifier CellIdentifier forIndexPath indexPath         return cell        and give the cells an identifier at  Attributes Inspector  in storyboard

User · Answer

I spent hours last night working out why my programmatically generated table crashed on  myTable setDataSource self   It was OK commenting out and popping up an empty table  but crashed every time I tried to reach the datasource   I had the delegation set up in the h file   interface myViewController   UIViewController    I had the data source code in my implementation and still BOOM   crash every time  THANK YOU to  xxd   nr 9   adding that line of code solved it for me   In fact I am launching a table from a IBAction button  so here is my full code       -  IBAction tapButton  id sender        UIViewController  popoverContent     UIViewController alloc init        UIView  popoverView     UIView alloc  initWithFrame CGRectMake 0  0  200  300        popoverView backgroundColor    UIColor greenColor       popoverContent view   popoverView         Add the table     UITableView  table     UITableView alloc  initWithFrame CGRectMake 0  0  200  300          style UITableViewStylePlain          NEXT THE LINE THAT SAVED MY SANITY Without it the program built OK  but crashed when      tapping the button        table registerClass  UITableViewCell class  forCellReuseIdentifier   Cell        table delegate self       table setDataSource self        popoverView addSubview table       popoverContent contentSizeForViewInPopover       CGSizeMake 200  300          create a popover controller     popoverController3     UIPopoverController alloc                            initWithContentViewController popoverContent       CGRect popRect   CGRectMake self tapButton frame origin x                                  self tapButton frame origin y                                  self tapButton frame size width                                  self tapButton frame size height          popoverController3 presentPopoverFromRect popRect inView self view   permittedArrowDirections UIPopoverArrowDirectionAny animated YES                 Table view data source in same m file     -  NSInteger numberOfSectionsInTableView  UITableView   tableView          NSLog   Sections in table           Return the number of sections      return 1           -  NSInteger tableView  UITableView   tableView numberOfRowsInSection  NSInteger section          NSLog   Rows in table            Return the number of rows in the section      return myArray count           -  UITableViewCell   tableView  UITableView   tableView cellForRowAtIndexPath  NSIndexPath      indexPath           static NSString  CellIdentifier     Cell       UITableViewCell  cell    tableView dequeueReusableCellWithIdentifier CellIdentifier forIndexPath indexPath        NSString  myValue         This is just some test array I created      myValue  myArray objectAtIndex indexPath row        cell textLabel text myValue      UIFont  myFont     UIFont fontWithName    Arial  size  12 0        cell textLabel font    myFont       return cell         By the way  the button must be linked up with as an IBAction and as a IBOutlet if you want to anchor the popover to it    UIPopoverController  popoverController3 is declared in the H file directly after  interface between

User · Answer

Make sure that the CellIdentifier    identifier of the cell in a storyboard  both names are same  Hope this works for u

User · Answer

you have to be aware that when using interface builder and creating a Xib  nib  containing one cell that there is also a placeholder created that points to the class that will be used  Meaning  when you place two UITableViewCell in one Xib file you possibly run into the exact same trouble causing an     Assertion failure      The placeholder mechanism doesn t work adn will be confused then  Instead placing different placeholders in one Xib read on   The most easy solution  even if that seems a bit to simple  is to place one Cell at a time in one Xib  IB will create a placeholder for you and all works as expected then  But this then leads directly to one extra line of code  because then you need to load the correct nib xib asking for the reuseIdentified Cell where it resides in  So the following example code focuses the use of multiple Cell Indentifiers in one tableview where an Assertion Failure is very common     possibly above class implementation static NSString  firstCellIdentifier     quot firstCellIdentifier quot   static NSString  secondCellIdentifier     quot secondCellIdentifier quot       possibly in - instancetype init  UINib  firstNib    UINib nibWithNibName   quot FirstCell quot  bundle nil    self tableView registerNib firstNib forCellReuseIdentifier firstCellIdentifier   UINib  secondNib    UINib nibWithNibName   quot SecondCell quot  bundle nil    self tableView registerNib secondNib forCellReuseIdentifier secondCellIdentifier    Another trouble with the use of two CellIdentifier s in one UITableView is that row height and or section height have to be taken care of  Two cells can have different heights of course  When registering classes for reuse the code should look different  The  quot simple solution quot  looks also much different when your cells reside inside a Storyboard instead of Xib s  Watch out for the placeholders  Keep also in mind that interface builder files have version wise variations and need to be set to a version that your targeted OS version supports  Even if you may be lucky that the particular feature you placed in your Xib is not changed since the last IB version and does not throw errors yet  So a Xib made with IB set to be compatible to iOS 13  but used in a target that is compiled on an earlier version iOS 12 4 will cause also trouble and can end up with Assertion failure

User · Answer

Working with Swift 3 0   override func viewDidLoad     super viewDidLoad    self myList register UINib nibName   MyTableViewCell   bundle  nil   forCellReuseIdentifier   Cell        public func tableView   tableView  UITableView  cellForRowAt indexPath  IndexPath  - gt  UITableViewCell   let cell   myList dequeueReusableCell withIdentifier   Cell   for  indexPath as IndexPath  as  MyTableViewCell  return cell

User · Answer

I ll just add that Xcode 4 5 includes the new dequeueReusableCellWithIdentifier forIndexPath  in its default template code - a potential gotcha for developers expecting the older dequeueReusableCellWithIdentifier  method

User · Answer

In Swift this problem can be solved by adding the following code in your      viewDidLoad   method   tableView registerClass UITableViewCell classForKeyedArchiver    forCellReuseIdentifier   your reuse identifier

User · Answer

In your storyboard you should set the  Identifier  of your prototype cell to be the same as your CellReuseIdentifier  Cell   Then you won t get that message or need to call that registerClass  function

User · Answer

Ran into this error bc cell re-use identifier was wrong-- a rookie mistake but it happens  1   Makes SURE cell re-use idenifier has no misspellings or missing letters  2   Along same line  don t forget capitalization counts  3   Zeroes are not  O s  Ohs

User · Answer

In my case  the crash happened when I calleddeselectRowAtIndexPath   The line was  tableView deselectRowAtIndexPath indexPath animated YES    Changing it to  self tableView deselectRowAtIndexPath indexPath animated YES   FIXED MY PROBLEM    Hope this helps anyone

User · Answer

FWIW  I got this same error when I forgot to set the cell identifier in the storyboard   If this is your issue then in the storyboard click the table view cell and set the cell identifier in the attributes editor   Make sure the cell identifier you set here is the same as   static NSString  CellIdentifier     YourCellIdenifier

User · Answer

Just a supplement of the answers  There may be a time you set all things right  but you may accidentally add some other UIs in you  xib  like a UIButton  Just delete the extra UI  it works

User · Answer

This might seem stupid to some people but it got me  I was getting this error and the problem for me was that I was trying to use static cells but then dynamically add more stuff  If you are calling this method your cells need to be dynamic prototypes  Select the cell in storyboard and under the Attributes inspector  the very first thing says  Content  and you should select dynamic prototypes not static

User · Answer

I give you the answer in both Objective C and Swift Before that I want to say      If we use the dequeueReusableCellWithIdentifier forIndexPath  we must register a class or nib file using the registerNib forCellReuseIdentifier  or registerClass forCellReuseIdentifier  method before calling this method as    Apple Documnetation Says   So we add registerNib forCellReuseIdentifier  or registerClass forCellReuseIdentifier       Once we registered a class for the specified identifier and a new cell must be created  this method initializes the cell by calling its initWithStyle reuseIdentifier  method  For nib-based cells  this method loads the cell object from the provided nib file  If an existing cell was available for reuse  this method calls the cell   s prepareForReuse method instead     in viewDidLoad method we should register the cell  Objective C  OPTION 1    self tableView registerClass  UITableViewCell class  forCellReuseIdentifier   cell      OPTION 2    self tableView registerNib  UINib nibWithNibName   CustomCell  bundle nil  forCellReuseIdentifier   cell      in above code nibWithNibName   CustomCell  give your nib name instead of my nib name CustomCell  SWIFT    OPTION 1   tableView registerClass UITableViewCell self  forCellReuseIdentifier   cell     OPTION 2   tableView registerNib UINib nibName   NameInput   bundle  nil   forCellReuseIdentifier   Cell      in above code nibName  NameInput  give your nib name

User · Answer

I think this error is about registering your nib or class for the identifier   So that you may keep what you are doing in your tableView cellForRowAtIndexPath function and just add code below into your viewDidLoad    self tableView registerClass  UITableViewCell class  forCellReuseIdentifier   Cell      It s worked for me  Hope it may help

User · Answer

You re using the dequeueReusableCellWithIdentifier forIndexPath  method   The documentation for that method says this      Important  You must register a class or nib file using the registerNib forCellReuseIdentifier  or registerClass forCellReuseIdentifier  method before calling this method    You didn t register a nib or a class for the reuse identifier  Cell    Looking at your code  you seem to expect the dequeue method to return nil if it doesn t have a cell to give you   You need to use the dequeueReusableCellWithIdentifier  for that behavior   UITableViewCell  cell    tableView dequeueReusableCellWithIdentifier CellIdentifier     Notice that dequeueReusableCellWithIdentifier  and dequeueReusableCellWithIdentifier forIndexPath  are different methods  See doc for the former and the latter   If you want to understand why you d want to ever use dequeueReusableCellWithIdentifier forIndexPath   check out this Q amp A

User · Answer

I had the same issue  was having the same error and for me it worked like this    self tableView registerNib  UINib nibWithNibName CELL NIB HERE bundle  nil  forCellReuseIdentifier CELL IDENTIFIER HERE     Maybe it will be usefull for someone else

User · Answer

i had the same problem replacing with   static NSString  CellIdentifier     Cell       UITableViewCell  cell    tableView dequeueReusableCellWithIdentifier CellIdentifier       if  cell  nil            cell     UITableViewCell alloc initWithStyle UITableViewCellStyleSubtitle reuseIdentifier CellIdentifier            solved

User · Answer

Swift 2 0 solution   You need to go into your Attribute Inspector and add a name for your cells Identifier     Then you need to make your identifier match with your dequeue like this   let cell2   tableView dequeueReusableCellWithIdentifier  ButtonCell   forIndexPath  indexPath  as  ButtonCell   Alternatively  If you re working with a nib you may need to register your class in your cellForRowAtIndexPath   override func tableView tableView  UITableView  cellForRowAtIndexPath indexPath  NSIndexPath  - gt  UITableViewCell               tableView registerClass UITableViewCell self  forCellReuseIdentifier   SwitchCell           included for context                 let cell   tableView dequeueReusableCellWithIdentifier  SwitchCell   forIndexPath indexPath  as  SwitchCell            continue         Apples s UITableView Class Reference says      Prior to dequeueing any cells  call this method or the   registerNib forCellReuseIdentifier  method to tell the table view how   to create new cells  If a cell of the specified type is not currently   in a reuse queue  the table view uses the provided information to   create a new cell object automatically       If you previously registered a class or nib file with the same reuse   identifier  the class you specify in the cellClass parameter replaces   the old entry  You may specify nil for cellClass if you want to   unregister the class from the specified reuse identifier    Here s the code from Apples Swift 2 0 framework      Beginning in iOS 6  clients can register a nib or class for each cell     If all reuse identifiers are registered  use the newer -dequeueReusableCellWithIdentifier forIndexPath  to guarantee that a cell instance is returned     Instances returned from the new dequeue method will also be properly sized when they are returned    available iOS 5 0     func registerNib nib  UINib   forCellReuseIdentifier identifier  String    available iOS 6 0     func registerClass cellClass  AnyClass   forCellReuseIdentifier identifier  String

User · Answer

Although this question is fairly old  there is another possibility  If you are using Storyboards  you simply have to set the CellIdentifier in the Storyboard   So if your CellIdentifier is  Cell   just set the  Identifier  property    Make sure to clean your build after doing so  XCode sometimes has some issues with Storyboard updates

[ios] Assertion failure in dequeueReusableCellWithIdentifier:forIndexPath:

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