为什么我的UITableViewCell指示空值

Question

I am trying to get a UITableViewCell to use to change its title and contents. However, I'm having trouble getting the tableViewCell because when I call the following method

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

inside of this method:

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ // 3
    static NSString *CellIdentifier = @"Flickr Photo Cell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; // Why is cell NULL?
    if(cell == nil){
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}

I can see in the debugger after setting a breakpoint that the value is (null):

And in my storyboard I set the cell identifier to be Flickr Photo Cell

Answer 1

Did you register a nib or cell class with that identifier before attempting to dequeue the cell? Registration is usually done in viewDidLoad :

- (void)viewDidLoad {
    [super viewDidLoad];
    UINib *cellNib = [UINib nibWithNibName:@"NameOfFlickrPhotoCellNib" bundle:nil];
    [self.tableView registerNib:cellNib forCellReuseIdentifier:@"Flickr Photo Cell"];
}

Answer 2

you can create you cell by code:

 -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ // 3
static NSString *CellIdentifier = @"Flickr Photo Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
// Why is cell NULL?
if(!cell){
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
//here configure you cel..Be carefully this cell doen't anything of you storyboard cell.
NSLog(@"Cell is not nil:%@",[cell description]);
return cell;
}

or using Storyboard (or xib)

 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"reuseINSTORYBOARD" forIndexPath:indexPath];

// Configure the cell...

return cell;
}