为标识符注册的无效nib（（null）） - nib必须只包含一个顶级

Question

I'm using a custom UITableViewCell . When I try to run my code, I got this exception stack and I can't understand the source of the problem:

terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'invalid nib registered for identifier ((null)) - nib must contain exactly one top level object which must be a UITableViewCell instance'

Please note I am not using Storyboard.

EDIT:

This is my relevant code which cause the problem according to the breakpoint:

[tableviewSupport registerNib:[UINib nibWithNibName:@"HotelCell" bundle:[NSBundle mainBundle]] forCellReuseIdentifier:CustomCellCId];

Answer 1

Another solution:

I had UITableViewCell, but in my XIB there was an extra object, a label which I had misplaced.

So check your XIB carefully to make sure there is only one object in the object table on the left side.

Answer 2

I'm not quite sure what you are trying to do in your provided code. You will unload your nib in tableView:cellForRowAtIndexPath:. You can use the below code:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    // Assuming you set a reuse identifier "cellId" in the nib for your table view cell...
    HotelCell *cell = (HotelCell *)[tableView dequeueReusableCellWithIdentifier:@"cellId"];
    if (!cell) {
        // If you didn't get a valid cell reference back, unload a cell from the nib
        NSArray *nibArray = [[NSBundle mainBundle] loadNibNamed:@"HotelCell" owner:nil options:nil];
        for (id obj in nibArray) {
            if ([obj isMemberOfClass:[HotelCell class]]) {
                // Assign cell to obj
                cell = (HotelCell *)obj;
                break;
            }
        }
     }

     return cell;
}

Now, based on the error you posted, iOS is expecting a single object in the array, so the for loop may be unnecessary. I've done this by checking if [nibArray count] == 1 and then grabbing the objectAtIndex:0 and assigning it to cell instead of looping, and this works as well. But, if one day Apple decides to stick something else in that nibArray, a for loop protects you against that.

Answer 3

This may not be the answer to the OP's question, but I had the same error with a different solution, so I'll answer this question for the sake of Googlers who come hereafter.

I did have a single UITableViewCell (actually, my own subclass) in my XIB -- so I couldn't understand why it wasn't working.

The key seems to be:

When you've created a XIB file with a single UITableViewCell or subclass (eg if you drag on a UITableViewCell from the library on the lower right), Interface Builder shows you an option under the "Table View Cell" section of the Inspector tab.

I usually used to create a UIView and changing its type to my UITableViewCell subclass, so I had never noticed that option.

It is there that you need to type the identifier (as well as in your registerNib:withReuseIdentifer: call).

More frustrating for me when experiencing this was that it didn't crash EVERY time, only the first time. Weird.

Answer 4

在我的例子中，我在tableviewcell中设置了一个具有名称类的属性（例如：@property（强，非原子）IBOutlet UILabel *类），这给出了上面提到的错误，然后名称“class”不是客观c类型，更改（class = classabc）解决上述问题。