Tae Tae - 11 months ago 56
Objective-C Question

Return a custom cell from cellForRowAtIndexPath:

I ran into a trouble and I'm looking for help.

I need to save a identifier in a cell, so I did a subclass
of UITableViewCell and added to it the identifier property. In my view
controller I create the cells as follow:

- (SidebarCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
UITableViewCell* tableViewCell = [super tableView:tableView cellForRowAtIndexPath:indexPath];
SidebarCell * cell = (SidebarCell *)tableViewCell;
Category *category = [categoryDataController.categories objectAtIndex:indexPath.row];
cell.textLabel.text = category.name;

if (category.checked == 1) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
} else {
cell.accessoryType = UITableViewCellAccessoryNone;

return cell;

The problem is that when I select one of the cells, the method
cellForRowAtIndexPath: returns an UTableViewCell object instead
of a SidebarCell, so I don't have access to the identifier property:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
[tableView deselectRowAtIndexPath:[tableView indexPathForSelectedRow] animated:NO];
SidebarCell *cell = (SidebarCell *)[tableView cellForRowAtIndexPath:indexPath]; // Trying to cast from UITableViewCell to SidebarCell

if (cell.accessoryType == UITableViewCellAccessoryNone) {
cell.accessoryType = UITableViewCellAccessoryCheckmark;
[CategoryDataController updateRow:cell.identifier status:1]; // Here the app crashes
} else if (cell.accessoryType == UITableViewCellAccessoryCheckmark) {
cell.accessoryType = UITableViewCellAccessoryNone;
[CategoryDataController updateRow:cell.identifier status:0];

is there a way for cellForRowAtIndexPath: to return an Sidebarcell object?

Thanks beforehand.


The SidebarCell.h

#import <UIKit/UIKit.h>

@interface SidebarCell : UITableViewCell

@property (nonatomic) NSInteger identifier;



#import "SidebarCell.h"

@implementation SidebarCell

@synthesize identifier;

- (id)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
return self;

- (void)setSelected:(BOOL)selected animated:(BOOL)animated
[super setSelected:selected animated:animated];

// Configure the view for the selected state


The error:

2012-04-24 09:21:08.543 Dongo[2993:11603] -[UITableViewCell identifier]: unrecognized selector sent to instance 0x6d87d50
2012-04-24 09:21:08.571 Dongo[2993:11603] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[UITableViewCell identifier]: unrecognized selector sent to instance 0x6d87d50'
*** First throw call stack:
(0x14b1052 0x1a65d0a 0x14b2ced 0x1417f00 0x1417ce2 0x116bc 0x48e71d 0x48e952 0xd1686d 0x1485966 0x1485407 0x13e87c0 0x13e7db4 0x13e7ccb 0x239d879 0x239d93e 0x3fea9b 0x2e85 0x2715 0x1)
terminate called throwing an exception(lldb)


You should leave the tableView:cellForRowAtIndexPath: method signature intact: it should return (UITableViewCell *) and not your custom cell class. Since your SidebarCell is a subclass of UITableViewCell, it should all "just work". No need to call super or any of that:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
    SidebarCell *cell = [tableView dequeueReusableCellWithIdentifier:@"CellIdentifier"];
    if (cell == nil) {
        cell = [[SidebarCell alloc] initWithStyle:UITableViewCellStyleDefault
    // ... set up the cell here ...
    return cell;

In other methods, the cast should work just as you have it:

SidebarCell *cell = (SidebarCell *)[tableView cellForRowAtIndexPath:indexPath];