Slow loading the images from URL in UITAbleView.

Question

I\'m loading the images from URL in UITableView. But it\'s very slow when loading an view. Here\'s an example,

UIImage *image = nil;
image = [UIImage imageW         


        

Answer 1

You've to use NSOperationQueue to make your tableview efficient.

Check this icodeblog tutorial and raywenderlich tutorial

Answer 2

Have a look at this tutorial. It helped me a lot. When I was using it I was quite new to iOS in general and it was helpful not only with respect to loading images from the web.

http://www.markj.net/iphone-asynchronous-table-image/

Answer 3

if you load the image all download from the internet every time , it must be very slow.

I think you shuold exist your download image to the filePath , and when you will load the image , you can check whether the image has been downloaded before , if not ,then download. if it has been downloaded , you can use imageWithContentsOfFile: method to load the image

Answer 4

//Make use of dispatch queue for faster processing of data. add this in viewDidLoad

    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), ^{
    NSData * data=[NSData dataWithContentsOfURL:[NSURL URLWithString:imageUrl]];
    [self performSelectorOnMainThread:@selector(setImage:) withObject:data waitUntilDone:YES];
});

//once data is got set the image and reload tableview

-(void)setImage:(NSData *)responseData
{
image = [UIImage imageWithData:responseData];
[tableView reloadData];
}

Answer 5

With AFNetworking it is more easy.

//AFNetworking

#import "UIImageView+AFNetworking.h"

[cell.iboImageView setImageWithURL:[NSURL URLWithString:server.imagen] placeholderImage:[UIImage imageNamed:@"qhacer_logo.png"]];

Answer 6

There are some open source libraries available for this:

1. HJCache
2. SDWebImage

These libraries download image in a asynchronous manner and cache it for further use.