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Wouldn’t the touchesBegan:withEvent always fire “before” or “after” each iteration of the CADisplayLink callback?
Edit: Here’s my CADisplayLink instantiation:
CADisplayLink *aDisplayLink = [CADisplayLink displayLinkWithTarget:self selector:@selector(tick:)]; [aDisplayLink addToRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
Assuming that the display link is connected to the main run loop then yes — it would be impossible for the two to occur at the same time. Cocoa’s run loops queue up messages to send, then send them one at a time.