Re: Synchronizing iOS redraw
Re: Synchronizing iOS redraw
- Subject: Re: Synchronizing iOS redraw
- From: Matt Neuburg <email@hidden>
- Date: Mon, 8 Nov 2010 08:33:34 -0800
On Sun, 7 Nov 2010 21:04:36 -0800, Rick Mann <email@hidden> said:
>I have a need to synchronize the actual display update of a UIView hierarchy with real time. In my case, I update the display once per second, and I want the display to update *on* the second.
>
>Since I don't really have control of when the draw happens, I don't know how to do this. I update all the various UILabels in my view, and then exit the current iteration of the run loop. Some time later iOS completes drawing and the display updates.
To force a view to update right now instead of waiting for the next "redraw moment" (as I call it), you might be able to take advantage of the "back door" rule that says that a transaction block that orders an animation to a layer, if the block is not preceded by any changes to the layer, will cause animation to begin immediately when the CATransaction class method +commit+ is called, without waiting for the redraw moment. m.
--
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