how to do multi-threading to load the image faster to tableView - ios

Question

-(void)viewDidLoad {
[super viewDidLoad]; // Do any additional setup after loading the view from its nib. self.navigationItem.title = #"New Arrivals";
[super viewDidLoad]; idsArray=[[NSMutableArray alloc]init]; namesArray=[[NSMutableArray alloc]init]; imagesArray=[[NSMutableArray alloc]init];
// create the URL we'd like to query
NSURL *myURL = [[NSURL alloc]initWithString:#"http://www.bikrionline.com/nwarvl-json.php"];
// we'll receive raw data so we'll create an NSData Object with it NSData *myData = [[NSData alloc]initWithContentsOfURL:myURL];
// now we'll parse our data using NSJSONSerialization if ([myData length]>0) { id myJSON = [NSJSONSerialization JSONObjectWithData:myData options:NSJSONReadingMutableContainers error:nil]; NSArray *jsonArray = (NSArray *)myJSON; for (int i=0 ; i<[jsonArray count] ; i++) { NSMutableString *urlString = [[NSMutableString alloc]initWithString:#"http://www.bikrionline.com/products/zmphotos/"]; NSString * name = [[[jsonArray objectAtIndex:i]objectForKey:#"prodname"]retain]; [namesArray addObject:name]; [idsArray addObject:[[jsonArray objectAtIndex:i]objectForKey:#"prodid"]]; [urlString appendString:[[jsonArray objectAtIndex:i]objectForKey:#"imageurl"]]; UIImage *imageObj = [self getImageFromUrl:urlString]; urlString = nil; [imagesArray addObject:imageObj]; } }
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
CustomCellView *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
NSArray *arrNib = [[NSBundle mainBundle] loadNibNamed:#"CustomCellView" owner:self options:nil];
cell = [arrNib objectAtIndex:0];
}
cell.imgName.text = [namesArray objectAtIndex:indexPath.row];
cell.custImageView.image=[imagesArray objectAtIndex:indexPath.row];
return cell;
}

Answer 1

You can use some Lib like SDWebImage or Afnetworking. Libs support lazy load image and auto cache this image.
All you need to do:
[cell.imageView setImageWithURL:[NSURL URLWithString:#"url of image"]
placeholderImage:nil];

Answer 2

This is looking a similar question like lazy loading of an image: Check iOS lazy-loading of table images and Loading images on scrollview using lazy loading
for your answer