UITableView with infite scrolling and lazy loading

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I’m not sure if I totally grok the fullness of your question, but here are some things that I did when confronted with a similar problem.

  • I used -tableView:cellForRowAtIndexPath: as my cue to load more data from the web. I picked a number (in my case 10), when indexPath.row + 10 >= self.data.count load more data.

    • I needed to call -tableView:cellForRowAtIndexPath: anyway.
    • I didn’t force a callback into the tighter loop of -scrollViewDidScroll:.

  • I subclassed UIImageView with a class that would async load images which I called URLImageView.

    • In -tableView:cellForRowAtIndexPath:, I assigned a URL to the URLImageView instance.
    • That assignment caused a background operation that would either load from disk or load from the web.
    • The operation was cancelable, so I didn’t keep working on an image that no longer needed loading.

I had a table view with hundreds (but not thousands) of images. I only had 2 or 3 table cells on the screen at once.

  • I used -refreshData: it worked like a champ.
  • I even got URLImageView to fade in the image. It was a very nice effect.

I hope that helps.

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