Crash with 'Could not load NIB in bundle ' while reloadRowsAtIndexPaths - ios

Question

In my app I need to expand the tableviewcell when the user taps on a particular button(which is like a toggle, tapping will expand the row and taping other time will collapse the row) in that cell. So I have implemented the custom delegate method to know which cell need to get reloaded and reload that particular cell with 'reloadRowsAtIndexPaths'.
It works fine while tapping the button for first time, and even for the second time, but its getting crashed by the third time saying 'Could not load NIB in bundle: 'NSBundle </Users/path/myApp.app> (loaded)' with name 'ContactCell''.
My question is reloading of the cell which works for first time and second time why its crashing for third time?
My Code:
[contactTableView beginUpdates]; // Inside the custom delegate method
[contactTableView reloadRowsAtIndexPaths:[NSArray arrayWithObject:indexpath] withRowAnimation:UITableViewRowAnimationNone]; // indexpath is which i get from cell through custom delegate method
[contactTableView endUpdates];
ContactTableCell *cell; //Inside the cellForRowAtIndexPath
static NSString *CellIdentifier = #"ContactCell";
cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
// load a new cell from the nib file
[[NSBundle mainBundle] loadNibNamed:#"ContactCell" owner:self options:nil];
cell = self.contactCell;
cell.delegate = self;
cell.indexPath = indexPath;
self.contactCell = nil;
}
Why is it crashing?

Answer 1

Ok there are a couple of problems with this. Firstly, loading from the nib should not be in this class it should be in the ContactTableCell class in an init method (initWithNib or what you want to call it)
Your XIB needs to make sure that ContactTableCell is the custom class assigned to it also.
so your init with nib would go something like this
//in ContactTableCell.m
-(id)initWithNib{
self = [[[NSBundle mainBundle] loadNibNamed:#"ContactCell" owner:self options:nil] firstObject];
if(self){
//do extra customisation stuff/ set labels etc.
}
return self;
}
Then you would call
if (cell == nil) {
// load a new cell from the nib file
cell = [[ContactTableCell alloc] initWithNib];
cell.delegate = self;
cell.indexPath = indexPath;
}

Answer 2

Register you nib in viewDidLoad once.
NSString *cellIdentifier=#"cellIdentifier";
UINib *nib=[UINib nibWithNibName:cellIdentifier bundle:[NSBundle mainBundle]];
[self.yourTableView registerNib:nib forCellReuseIdentifier: cellIdentifier];
Hope this will work