Program crashes at dequeueReusableCellWithIdentifier: - iphone

Question

I have a program in which there is a tableViewController which has 1 section and 3 rows. Whenever I run the app, it always crashes at dequeueReusableCellWithIdentifier: method. I inserted a breakpoint and NSLog() to zero in the this method. I also set the Cell Identifier of the prototype cell in storyboard to Cell. But the program still crashes. Here's an method that is causing the problem:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"indexPath.section = %d, indexPath.row = %d", indexPath.section, indexPath.row);
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil)
{
NSLog(#"in nil");
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
return cell;
}
The crash log reads:
MyAppTake4[7463:707] indexPath.section = 0, indexPath.row = 0
2012-11-05 23:21:20.747 MyCardAppTake4[7463:707] -[UITableView dequeueReusableCellWithIdentifier:forIndexPath:]: unrecognized selector sent to instance 0xfbc9000
2012-11-05 23:21:20.753 MyCardAppTake4[7463:707] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableView dequeueReusableCellWithIdentifier:forIndexPath:]: unrecognized selector sent to instance 0xfbc9000'
*** First throw call stack:
(0x3254788f 0x3459d259 0x3254aa9b 0x32549915 0x324a4650 0x7e2f7 0x31fceefb 0x31fcdfd9 0x31fcd763 0x31f71f15 0x324a61fb 0x3420aaa5 0x3420a6bd 0x3420e843 0x3420e57f 0x342064b9 0x3251bb1b 0x32519d57 0x3251a0b1 0x3249d4a5 0x3249d36d 0x315f4439 0x31f9ccd5 0x7d9f9 0x7d994)
terminate called throwing an exception(lldb)
I am interested in identifying the exact cause of error so that I do not make this mistake again.
Thanks for your help.

Answer 1

Thats because [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath]; was added in iOS 6 but not recognized by iOS 5. For iOS 5 compatibility use below method instead:
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

Answer 2

Did you register the class of the cell or the nib first?
From the Apple docs:
Important: You must register a class or nib file using the registerNib:forCellReuseIdentifier: or registerClass:forCellReuseIdentifier: method before calling this method.
(btw that method is only available in iOS 6)
If you're using iOS 6, then you can use the new simpler paradigm:
In viewDidLoad, register the class, in your case, that's just the UITableViewCell class:
[self.tableView registerClass:[UITableViewCell class] forCellReuseIdentifier:#"Cell"];
Then, you can just do it like this in cellForRowAtIndexPath:
- (UITableViewCell *) tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"Cell" forIndexPath:indexPath];
cell.textLabel.text = self.myArray[indexPath.row];
return result;
}

Answer 3

Since forIndexPath method is for ios6, I recommend you to use this snipet. Find below.
UITableViewCell *cell = [table_view dequeueReusableCellWithIdentifier:#"cell"];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"cell"];
// **initialize** your stuff here **with their respected tag**
}
else
{
// **get** your stuff back using their tags
}
// **assign** your valiues here
return cell;
Enjoy Programming

Answer 4

I had this exception, and realised that it was caused by my stupid mistake. I had created a blank .xib file (to have a custom "Loading" cell in my UITableView), but had then drag'n'dropped a View into it. Doh!
The result was the exception message which you're seeing, plus this in the Output window:
2014-04-25 20:45:12.953 Languages[36256:60b] *** Terminating app due to uncaught
exception 'NSInternalInconsistencyException', reason: 'invalid nib registered
for identifier (LoadingCell) - nib must contain exactly one top level object
which must be a UITableViewCell instance'
The solution, of course, was to add a Table View Cell to my .xib file, copy the other UI components into it, and just leave that Table View Cell as the "root" element in the file.

Answer 5

Another cause for this error can be-
invalid nib registered for identifier (Cell) - nib must contain exactly one top level object which must be a UICollectionReusableView instance
I had a UIView in my xib instead of a collectionViewCell. Hope this helps.