Images in UITableView keep re-loading and wrong images flash while scrolling

Question

i have created a UITableView which populates each cell from URL requests. I have used \'dispatch_queue\' to prevent the UItableView from freezing. For some reason when i s

Answer 1

You should consider using this library SDWebImage, available here https://github.com/rs/SDWebImage for that kind of problems. It handles asynchronous download and cache for remote images very easily.

The simpliest installation is done by using CocoaPods

CocoaPods (http://cocoapods.org) is a dependency manager for Objective-C, which automates and simplifies the process of using 3rd-party libraries in your projects. See the Get Started section for more details.

Use in your Podfile

platform :ios, '6.1'
pod 'SDWebImage', '~>3.6'

After installing the dependency for SDWebImage, just simply use the following lines in your view controller :

#import 

...

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *MyIdentifier = @"MyIdentifier";

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:MyIdentifier];

    if (cell == nil)
    {
        cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault
                                       reuseIdentifier:MyIdentifier] autorelease];
    }

    // Here we use the new provided setImageWithURL: method to load the web image
    [cell.imageView setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
                   placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

    cell.textLabel.text = @"My Text";
    return cell;
}