Why my tableview is slow?

Question

im making a tableview loaded with some NSArrays, the cell contains two labels and a background image view loaded with a URL image. The problem is that the scrolling of the table

Answer 1

You are calling [NSData dataWithContentsOfURL:[NSURL URLWithString:_ImageUrl[row]]] from cellForRowAtIndexPath , which is not good idea. Because it'll go to the server every time a UITableViewCell is loaded.

You must use Asynchronous image loading & cache. These libraries might help you : (My personal favourite is SDWebImage)

1) https://github.com/rs/SDWebImage

2) https://github.com/nicklockwood/AsyncImageView

And more, you can refer to the sample code by Apple about LazyTableImages - https://developer.apple.com/library/ios/samplecode/LazyTableImages/Introduction/Intro.html

UPDATE:

For SDWebImage follow this guide. It's very good.

http://iosmadesimple.blogspot.in/2013/04/lazy-image-loading.html