How to customize a UITableViewCell without any freezing in UITableView - iphone

Question

I have customized the table view cell, created nib file and its corresponding .h and .m file. Everything works fine except slowness while scrolling, what could be the problem how can I avoid the freezing?
And
obj = [self.listData objectAtIndex: [indexPath row]];
if (obj != nil) {
static NSString *CellIdentifier;
if (obj->status == status1) {
CellIdentifier = #"Cell_italic";
} else if (obj->status == status2) {
CellIdentifier = #"Cell_cent";
} else {
CellIdentifier = #"Cell";
}
custom_cell *cell = (custom_cell*) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"custom_cell" owner:self options:nil];
cell = [nib objectAtIndex:0];
char file_path[MAX_PATH]; // Holds file path.
memset(file_path, 0, MAX_PATH);
// Get path
// Set Image
UIImage *cellImage = [UIImage imageWithContentsOfFile:fle_path];
if (cellImage != nil) {
[cell.image_view setImage:cellImage];
}
NSString *combined_name = [NSString stringWithCString:obj->combined_name encoding:NSASCIIStringEncoding];
NSString *email = [NSString stringWithCString:obj->email encoding:NSASCIIStringEncoding];
// Set name
if (obj->status == status1)
{
cell.name_label.text = combined_name;
cell.name_label.font = [UIFont fontWithName:#"Georgia-Italic" size:18];
cell.email_label.text = email;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
return cell;
}
. . .
. . .
}
dequeueReusableCellWithIdentifier is always returning nil, Is it right? Without customization I have seen it was not nil many times, now it always returning nil.

Answer 1

image loading each-time that's why Table scroll freezing in UITableView you can implement lazy-loading many way refer bellow links and demos may be its helps you :-
https://developer.apple.com/library/ios/#samplecode/LazyTableImages/Introduction/Intro.html
https://github.com/rs/SDWebImage //README Section says,how to use it in your app.
https://github.com/nicklockwood/AsyncImageView/
you can also load image in Background Process using UI thread
dispatch_queue_t backgroundQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
dispatch_queue_t mainQueue = dispatch_get_main_queue();
dispatch_async(backgroundQueue,^{
// background process
image = [NSData dataWithContentsOfFile:imageName];
dispatch_async(mainQueue,^{
// always update GUI from the main thread
// uiimageview.image = image.... etc
});
});