Smooth scrolling of UITableView - ios

Question

I have a smooth scrolling problem with the UITableView. Can anyone help me where is the problem? The code I have written is this-
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CustomTableCell";
LabTestCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"CustomTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}//cell.txtHeading.text=#"hello";
cell.txtHeading.text=[[_ResponseDic valueForKey:#"title"]objectAtIndex:indexPath.row];
cell.txtdescribtion.text=[[_ResponseDic valueForKey:#"description"]objectAtIndex:indexPath.row];
cell.txtPrice.text=[[_ResponseDic valueForKey:#"purchase_price"]objectAtIndex:indexPath.row];
cell.txtLabName.text=[[_ResponseDic valueForKey:#"brand"]objectAtIndex:indexPath.row];
NSString *path=#"https://www.fingerfry.com/pharmgo/uploads/product_image/";
NSString *url=[path stringByAppendingString:[[_ResponseDic valueForKey:#"main_image"]objectAtIndex:indexPath.row]];
NSData* imageData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:url]];
UIImage* image = [[UIImage alloc] initWithData:imageData];
cell.image.image=image;
return cell;
}

Answer 1

If you load the image in cellForRowAtIndexPath, use Asynchronous method backgroundly load the images, use this below code,
dispatch_queue_t image_queue = dispatch_queue_create("com.company.app.imageQueue", NULL);
dispatch_queue_t main_queue = dispatch_get_main_queue();
NSString *path=#"https://www.fingerfry.com/pharmgo/uploads/product_image/";
NSString *url=[path stringByAppendingString:[[_ResponseDic valueForKey:#"main_image"]objectAtIndex:indexPath.row]];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES);
NSString *cachePath = [paths objectAtIndex:0];
NSString *dataPath = [cachePath stringByAppendingPathComponent:url];
NSFileManager *fileManager = [NSFileManager defaultManager];
if ( [fileManager fileExistsAtPath:dataPath] )
{
UIImage *image = [UIImage imageWithContentsOfFile:dataPath];
[cell.imgView setImage:image];
}
else
{
[cell.imgView setImage:[UIImage imageNamed:#"images.png"]];
dispatch_async(image_queue, ^{
NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];
UIImage *image = [UIImage imageWithData:imageData];
[UIImagePNGRepresentation(image) writeToFile:dataPath atomically:YES];
dispatch_async(main_queue, ^{
[cell.imgView setImage:image];
});
});
}
I have the same issue, i had put the above code in cellForRowAtIndexPath, its working normal scrolling, hope its helpful

Answer 2

First install the pod:
pod 'SDWebImage/WebP', '~>3.7' in pod file.
Then you have to import:
#import <SDWebImage/UIImageView+WebCache.h>
Write below code:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"CustomTableCell";
LabTestCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:#"CustomTableCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
}//cell.txtHeading.text=#"hello";
cell.txtHeading.text=[[_ResponseDic valueForKey:#"title"]objectAtIndex:indexPath.row];
cell.txtdescribtion.text=[[_ResponseDic valueForKey:#"description"]objectAtIndex:indexPath.row];
cell.txtPrice.text=[[_ResponseDic valueForKey:#"purchase_price"]objectAtIndex:indexPath.row];
cell.txtLabName.text=[[_ResponseDic valueForKey:#"brand"]objectAtIndex:indexPath.row];
[cell.image sd_setImageWithURL:[NSURL URLWithString:[obj valueForKey:IMAGE_KEY]] placeholderImage:nil options:SDWebImageRefreshCached completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType, NSURL *imageURL) {
}];
return cell;
}
Reference link :
https://github.com/rs/SDWebImage