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Editorial Team
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Asked: 2026-06-13T11:39:01+00:00

I have an app that has to load and render a fair amount of

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I have an app that has to load and render a fair amount of content onto screen (mostly loading from a database).

I won’t post all the code here but in effect it simply builds up a set of UIView objects that are added to a UIScrollView object. Nothing too complicated, just loaded quite a lot of stuff. This currently takes a second or so render everything (running on the main thread).

I want to show an activity indicator whilst the loading is happening, and I think the best way to do this is to have the method that takes a long time happen on a background thread and “report back” when it is complete.

The question is this. I know all the actual drawing is done by the main thread, so is it possible to create a new thread and have that build up a set of UIView objects that are then drawn on screen?

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1 Answer

  1. Editorial Team

    there is a great WWDC2012 session video, that deals exactly with your use case:

    WWDC2012 Building Concurrent User Interfaces in iOS

    Basically the trick is to prepare and draw the views on another queue and ship it over to the main queue.

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