UITableViewCells not getting reused when scrolling - ios

Question

I'm building an app where a screen should show a tableview where in the tableview first two row are two different custom cells and the rest are different custom cells. So I have did this in my cellForRowAtIndexPath:
My Code:
if (indexPath.row == 0 && !isSearchEnabled) {
FirstRowViewCell *cell;
static NSString *CellIdentifier = #"FirstCell";
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.firstCell;
//cell.delegate = self;
//cell.indexPath = indexPath;
self.firstCell = nil;
}
return cell;
} else if (indexPath.row == 1 && !isSearchEnabled) {
SecondRowViewCell *cell;
static NSString *CellIdentifier = #"SecondCell";
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.secondCell;
//cell.delegate = self;
//cell.indexPath = indexPath;
self.secondCell = nil;
}
return cell;
}else {
static NSString *CellIdentifier = #"ContactCell";
ContactTableCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
[[NSBundle mainBundle] loadNibNamed:#"ContactCell" owner:self options:nil];
// load a new cell from the nib file
cell = self.contactCell;
cell.delegate = self;
cell.indexPath = indexPath;
self.contactCell = nil;
}
return cell;}
but its lagging when scrolling the tableview. When I checked with the Time Profiler in instruments its showing that cellForRowAtIndexPath especially the
[[NSBundle mainBundle] loadNibNamed:#"ContactCell" owner:self options:nil];
is taking much time to load which causes lag. My question is, do the cell getting reused or not, because the above line getting executed for each and every cell even we are scrolling to the top. Please help me to get through the lag problem. Thanks!

Answer 1

try this may be it will helps
static NSString *simpleTableIdentifier = #"ContactCell";
ContactCell *cell = (ContactCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"ContactCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}
return cell;

Answer 2

You are creating cells that do not have the reuseIdentifier set. reuseIdentifier is a readonly property of UITableViewCell. What you should do instead is register the nib with the tableview, perhaps in the viewDidLoad or viewWillAppear method of your UIViewController.
UINib *cellNib = [UINib nibWithNibName:#"ContactCell" bundle:nil];
[tableView registerNib:nib forCellReuseIdentifier:CellIdentifier];
Once you do this, dequeueReusableCellWithIdentifier: will always return a valid cell, whether it is instantiating it or reusing it for you.
You can refer to this Apple documentation: UITableView, UITableViewCell, and UINib.