Custom UITableView not refreshing cells - objective-c

Question

I am creating a custom UITableViewCells. I am using a NIB file as the cell. Its displaying some data from REST API's. The problem I am having is when I scroll down & then back up, the cells are not refreshed. It shows the data from when I scrolled down. Here's my code -
MyViewController.h
#interface FLOViewController : UIViewController <UISearchBarDelegate,
UITableViewDelegate,
UITableViewDataSource>
{
UISearchBar *sBar;
UITableView *searchResTable;
NSArray *searchRes;
UITableViewCell *resultsOne;
}
#property (nonatomic, retain) IBOutlet UILabel *photos;
#property(nonatomic, retain) IBOutlet UITableView *searchResTable;
#property (nonatomic, retain) NSArray *searchRes;
/* Search Results Templates */
#property (nonatomic, assign) IBOutlet UITableViewCell *resultsOne;
MyViewController.m
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if(self.searchRes == nil)
return nil;
static NSString *cId = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cId];
if(cell == nil)
{
NSLog(#"CREATING NEW CELL");
[[NSBundle mainBundle] loadNibNamed:#"ResultsOne" owner:self options:nil];
cell = self.resultsOne;
self.resultsOne = nil;
}
cell.selectionStyle = UITableViewCellSelectionStyleNone;
//from here on displaying images etc from REST API.
UIImageView *uPhoto = (UIImageView *)[cell viewWithTag:2];
NSString *photoURL = [[self.searchRes objectAtIndex:[indexPath row]] objectForKey:#"originator_photo_url"];
if(photoURL)
{
[UIView beginAnimations:#"fadeIn" context:NULL];
[UIView setAnimationDuration:0.5];
NSString *urlString = [NSString stringWithString:photoURL];
[uPhoto setImageWithURL:[NSURL URLWithString:urlString]
placeholderImage:[UIImage imageNamed:[NSString stringWithFormat:#"ph%d.png",[indexPath row]]]];
[UIView commitAnimations];
}
//similarly display other sections in the cell...
Why are the contents of my cell not refreshing? Even when I put in completely new data (through search from REST API's) some of the cells still show old views in the tablecells.
UPDATE: If I comment out UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cId]; then the problem is solved. i.e. I dont see repetition of cell content on scrolling.
Because I am creating custom ImageViews in UITableViewCell do i need to do something special to clear out the cell content before new content can be added??

Answer 1

To me it looks like you forgot to reset the uPhoto-UIImageView, in case the photoURL is nil. This brings in cached data.
if (photoURL) {
...
}
else {
uPhoto.image = nil;
}

Answer 2

You are using
static NSString *cId = #"Cell";
Let's try different identifier for each cell. I face this problem and solve it by using different cell identifier like
static NSString *cId =[NSString StringWithFormat : #"Cell_%d_%d",[indexPath section], [indexPath row] ];
I think it may solve your problem.