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POiOS - dispatcherTimer blocking touches events?
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  1. POiOS - dispatcherTimer blocking touches events?
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    copied!<p>I am using the dispatcher source timer update a view at different frame rates. (8, 12 or 24 FPS) </p> <p>Here is the code that initializes the dispatcherTimer and the function used to create the timer.<br> (this function is directly taken from apple doc in the subsection "creating a timer": <a href="http://developer.apple.com/library/mac/#documentation/General/Conceptual/ConcurrencyProgrammingGuide/GCDWorkQueues/GCDWorkQueues.html" rel="nofollow">http://developer.apple.com/library/mac/#documentation/General/Conceptual/ConcurrencyProgrammingGuide/GCDWorkQueues/GCDWorkQueues.html</a>) </p> <p>call:</p> <pre><code> self.dispatchTimer = [self createDispatchTimerWithInterval:self.project.frameDuration * NSEC_PER_SEC leeway:0.0 * NSEC_PER_SEC queue:dispatch_get_main_queue() block:displayFrame]; </code></pre> <p>function:</p> <pre><code>- (dispatch_source_t)createDispatchTimerWithInterval:(uint64_t)interval leeway:(uint64_t)leeway queue:(dispatch_queue_t)queue block:(dispatch_block_t)block { dispatch_source_t timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue); if (timer) { dispatch_source_set_timer(timer, dispatch_walltime(NULL, 0), interval, leeway); dispatch_source_set_event_handler(timer, block); dispatch_resume(timer); } return timer; } </code></pre> <p>My view updates perfectly, but the touch events are not caught. My first bet would be that the block "displayFrame" takes too much processing time because if I reduce the frameDuration to 0.5 second or so, the touch events are caught. </p> <p>I only tested this on iOS 4 with a iPad 2. </p> <p>Any help or hint would be greatly appreciated! </p> <p>Etienne</p> <p><strong>UPDATE</strong></p> <p>I have asked a similar question on the apple developper forum, here is the answer I got: <a href="https://devforums.apple.com/thread/156633?tstart=0" rel="nofollow">https://devforums.apple.com/thread/156633?tstart=0</a></p>
 

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