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Asked: 2026-05-20T17:51:51+00:00

Due to some self induced problems, I was able to crash my iPhone app

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Due to some self induced problems, I was able to crash my iPhone app and received the following error:

Tried to obtain the web lock from a thread other than the main thread or the web thread. This may be a result of calling to UIKit from a secondary thread. Crashing now...

Resolving this problem isn’t an issue, but the error message got me thinking…

I know what the main thread is, and I’m aware of how to switch contexts back to it. But, what is this “web thread”? I don’t think I’ve ever heard that terminology before.

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1 Answer

  1. Editorial Team

    The web thread is a single thread shared by all UIWebViews which temporarily blocks execution on the main thread while it’s performing requests.

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