Waiting for UIWebView with Dispatch Semaphores
Waiting for UIWebView with Dispatch Semaphores
- Subject: Waiting for UIWebView with Dispatch Semaphores
- From: Jeff Kelley <email@hidden>
- Date: Tue, 21 Dec 2010 11:52:36 -0500
I’m trying to create a synchronous method on iOS (4.2.1) to create a
thumbnail image for a PowerPoint file. To accomplish this, I want to
load the file into a web view, then wait for it to load, then render
its context into a new graphics context and save it to an image.
Here’s what I have so far:
http://pastie.org/1395434
I’ve tried adding the web view as a subview of the UIWindow to force
it to render, but that didn’t seem to matter. The problem is line 26:
waiting for the semaphore to be signaled blocks the thread, and the
web view won’t load. None of the delegate methods will ever be called
while I’m blocking.
Is there a way to synchronously wait for the web view? All
combinations of splitting things off on separate threads fall apart
when I try to wait for the image to be created.
Thanks in advance for any suggestions.
Jeff Kelley
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