iPhone :How to display some default image until original images are not loaded from the JSON?

Question

I am loading images using the JSON.

But it makes app slow as it use to wait until all images are downloaded in app.

To avoid this situation I want to put some default image. And when app downloads image it should replace that default image.

I am not using table view. I am displaying this images in coverflow.

How do I get this ?

are you using a tableview? then search for "lazy loading" of images - that'll do. — Philipp Kyeck, Jul 20 '11 at 06:45
i've never done anything with coverflow, but this should also work for CF: http://stackoverflow.com/questions/531482/lazy-load-images-in-uitableviewcell — Philipp Kyeck, Jul 20 '11 at 06:51

score 0 · Accepted Answer · answered Jul 20 '11 at 06:45

This sample demonstrates a multi-stage approach to loading and displaying a UITableView. It begins by loading the relevant text from an RSS feed so the table can load as quickly as possible, and then downloads the images for each row asynchronously so the UI is more responsive.

http://developer.apple.com/library/ios/#samplecode/LazyTableImages/Introduction/Intro.html

score 0 · Answer 2 · answered Jul 20 '11 at 06:53

check out Web Image https://github.com/rs/SDWebImage/

it has:

setImageWithURL:placeholderImage:

method which you can use like:

 [imageview setImageWithURL:[NSURL URLWithString:@"http://www.domain.com/path/to/image.jpg"]
           placeholderImage:[UIImage imageNamed:@"placeholder.png"]];

score 0 · Answer 3 · answered Jul 20 '11 at 07:19

0

Also check out TTImageView from the Three20 library.

answered Jul 20 '11 at 07:19

TomL

759
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score 0 · Answer 4 · answered Nov 29 '11 at 10:13

0

Set the property

photoView.defaultImage = defaultImage;

defaultImage(on right ) is the UIImage

answered Nov 29 '11 at 10:13

Rahul Chavan

480
3
6

iPhone :How to display some default image until original images are not loaded from the JSON?

4 Answers4