I am working on an iPhone app.In this app I need to display many images in uitableview.I am able to load the image in the background thread.But can anyone suggest how can I cache the downloaded image in background thread.I am able to cache the image but it is happenening in foreground not in background.Thats why the UI gets blocked until the caching completes.Thanks in advance.
Hi you can try SDWebImage Cache, it is very easy to use and it will do caching part.
The caching interval is set to one week, you can check it in SDImageCache.m.
Related
I am developing a shopping app using web API,
But getting issues like whenever app open
It will take to much time to load products.
Maybe from product image will take time to render
, any idea how to resolve this issue
U can improve a performance of your app by doing following steps
Use pagination(i.e load 10 or 15 product from web api) on scroll
Maintain low size images at server so it could load fast.
Show a busy image while the actual image is downloading, and when the image is downloaded, remove busy image and show the actual image.
1 - use ion-infinite-scroll
2 - lazy load the images
3 - use image cache
In my application users can add up to 8 images taken by the camera and upload them to the server one-by-one.
My problem is that even when taking the first picture i get an memory warning, which of course forces the app to release any view not visible.
What is the best practice approach to handling pictures?
How do I hold them until they're uploaded, without running out of memory?
My objective is to avoid any memory warnings.
Thanks in advance.
/Esben
After clicking images store images into Document directory. It is most safe option to store
images and then use it. Find some tutorial and after click image send image to document
directory and then fetch from directory and use it. Hope it helps you.
Proceed Following steps.
I am faced like this problem, now it's working for me use following steps.
Select image and and display to UIImageView. then Upload to server.
Release UIImageView.
Again take picture and upload to server.
For the iPhone 5.0 (ARC) I am getting lot of image(image url's) and text data from server in a json form. My requirement is to load the first five images from the server and when the user scrolls down the next five images load and so on. I need to show it in a UITableViewCell. By doing this I can reduce the network calls and make the application faster on the device.
Currently, I am using a background thread to load images, but they continuously load in the background. I don't want to do it like this.
I strongly encourage you to use the AFNetworking framework (that is really great and complete for all network-related tasks).
It comes with a category on UIImageView that allows you to set the UIImageView's image directly from an NSURL, managing everything for you in the background, like downloading the image or fetching it from its cache, cancelling the request if you change the URL later to avoid useless requests, etc.
Then in your tableView:cellForRowAtIndexPath: you can simply write this kind of code:
[cell.imageView setImageWithURL:yourURL];
And you're done. It will work even when the recycling mechanism of the UITableView is in action when you scroll, which would be quite a pain to manage using other methods.
Take a look at SDWebImage. It's a really neat library to download images asynchronously and also caches them.
I get the text form the sever like this:
test_abc
http://www.xxx.a.jpg
test_aaa
http://www.xxx.b.jpg
test_ccc
I want to split the string to ["test_abc", "http://www.xxx.a.jpg", "test_aaa", "http://www.xxx.b.jpg", "test_ccc"] and then display them in a UITableViewCell,before the images will be downloaded, I used a LoadingIndicator as placeholder, when the images will be downloaded, display the images and modify the height of the cell to display the whole images.
Can someone help me do this?
Try looking into Three20
An open source library written by the guy who wrote the official "Facebook" app for iOS. Moreover, the code of the facebook app is based on that library.
You may use SDWebImage, and you don't have to worry about cache, etc..
Web Image
This library provides a category for UIImageVIew with support for remote images coming from the web.
It provides:
An UIImageView category adding web image and cache management to the Cocoa Touch framework
An asynchronous image downloader
An asynchronous memory + disk image caching with automatic cache expiration handling
A guarantee that the same URL won't be downloaded several times
A guarantee that bogus URLs won't be retried again and again
Performances!
I am looking for a direction on a background image upload on the iPhone, background meaning in my app while other interface items are processing and views are changing.
I was thinking that there would be a way in the appDelegate to spawn a process to upload the file, then have a delegate return the status.
Has anyone seen an example of this?
I plan on using ASIHTTPRequest in my app to handle communications to web servers in the background.