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POThe right approach to loading dynamic content into a UITableView in iOS
 

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  1. POThe right approach to loading dynamic content into a UITableView in iOS
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    <p>ok, I've read tons of bits and pieces on the subject of loading dynamic content (from the web) into a UITableView and the problem with calculating cell height upfront. I've tried different simple implementations but the problem persists... </p> <p>Assuming I need to read a JSON file from the web, parse it into 'item' objects, each with variable size image and various text labels, <strong>here is what I believe would be the right approach to avoid long hang time of the app while everything is loading</strong>:</p> <ol> <li>on app load read JSON file and parse into items array</li> <li>provide only small part of the items array to the tableview (about 10 items) - since I need to load the images associated with each item to calculate cell height - I don't want the view to go through the whole items list and load all images - this hangs the app until every image is loaded</li> <li>display the tableview with the available cells (assuming I load a few 'spare' ones, user can even scroll to more items)</li> <li>in the background using Grand Central Dispatch download images for all/some of the remaining items and then reload the tableview with the new data (repeat step 4 if item list is very long)</li> </ol> <p>Step 2 above is necessary since I have no way to calculate the cell height without loading the images first, and since tableview first calculates height of all cells it may take a very long time to download all images for all items.</p> <p>Would you say this is the right approach? am I missing something?</p>
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