Reputation: 5023

Slow loading the images from URL in UITAbleView.

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 imageWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://calcuttans.com/palki/wp-content/uploads/2009/02/kidscover-small.png"]]];

In Table view, UIButton i'm setting the background image.

Please Can you provide the sample.

FYI : I'm used the LazzyTable sample program but it's not much helpful. Can you suggest any other samples.

Upvotes: 0

Answers (9)

A. Trejo

Reputation: 660

With AFNetworking it is more easy.

//AFNetworking

#import "UIImageView+AFNetworking.h"

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

Upvotes: 0

Vinayak Kini

Reputation: 2919

//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];
}

Upvotes: 2

Midhun MP

Reputation: 107121

There are some open source libraries available for this:

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

Upvotes: 3

Guo Luchuan

Reputation: 4731

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

Upvotes: 2

Hermann Klecker

Reputation: 14068

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/

Upvotes: 1

Vitalii Ivanov

Reputation: 3251

Load image asynchronously

NSURL* url = [NSURL URLWithString:@"http://calcuttans.com/palki/wp-content/uploads/2009/02/kidscover-small.png"];
    NSURLRequest* request = [NSURLRequest requestWithURL:url];


[NSURLConnection sendAsynchronousRequest:request
        queue:[NSOperationQueue mainQueue]
        completionHandler:^(NSURLResponse * response,
            NSData * data,
            NSError * error) {
    if (!error){
            NSImage* image = [[NSImage alloc] initWithData:data];
        // do whatever you want with image
    }

}];

Upvotes: 17