Asynchronously set images in tableview

Question

I have a TableView using custom cells. I initially was setting grabbing an image from a URL in the cellForRowAtIndexPath method

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Answer 1

Step 1: Have a cache containing images. Either just in memory, better on disk.

Step 2: When you need an image, call a method which either returns an image from the cache, or returns a default image and starts a download.

Step 3: When a download finishes, add the image to the cache. Then find out which rows need the image. Reload all the rows that reload the image.

The download should be done asynchronously using GCD. I would really recommend that you add the download code into a separate, reusable method so that you can handle download errors. Even if you don't do it now, you will do it later.