On Apr 25, 2012, at 6:07 PM, Kévin Vavelin <vavelinke...@gmail.com> wrote:
> Hi there,
>
> I've a question about the dispatch_timer function. I try to make a strobe
> flash on my iPhone app and for that i used an NSTimer but a friend of mine
> say that it's better to use dispatch function. So i was looking and try to
> implement something. I explain my code before post anything :
> I have a UISlider in another view (settings.strobeValue) and get his value
> for settings the timer. And i called changeStrobeState in another function
> who wll be called by dispatch function. But when i hit the button on my view
> and send my dispatch code, no work at all... So there is the code :
>
> -(void)changeStrobeState
> {
> if (NO == [[NSUserDefaults standardUserDefaults]
> boolForKey:@"buttonStrobeState"])
> {
> [deviceCapture lockForConfiguration:nil];
> [deviceCapture setTorchMode:AVCaptureTorchModeOff];
> [deviceCapture unlockForConfiguration];
> }
> else
> {
> [deviceCapture lockForConfiguration:nil];
> [deviceCapture setTorchMode:AVCaptureTorchModeOn];
> [deviceCapture unlockForConfiguration];
> }
> BOOL state = [[NSUserDefaults standardUserDefaults]
> boolForKey:@"buttonStrobeState"];
> [[NSUserDefaults standardUserDefaults] setBool:!state
> forKey:@"buttonStrobeState"];
>
> }
>
>
> - (dispatch_source_t)setupStrobeTimer {
> static dispatch_once_t onceToken;
> dispatch_once(&onceToken, ^{
> dispatch_queue_t queue =
> dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
> _strobeTimer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0,
> 0, queue);
> if (_strobeTimer) {
> dispatch_source_set_timer(_strobeTimer,
> dispatch_walltime(DISPATCH_TIME_NOW, settings.strobeValue * NSEC_PER_SEC),
> settings.strobeValue * NSEC_PER_SEC,
> 6ull * NSEC_PER_SEC);
> __block ViewController *blockSelf = self;
> dispatch_source_set_event_handler(_strobeTimer, ^{
> [blockSelf changeStrobeState];
> });
Kévin,
Your code is not calling dispatch_resume() on the timer source. Please review
the man page and/or other documentation.
davez
> }
> });
> return _strobeTimer;
> }
>
> Can you help me ?
>
> Thanks for reading and sorry 'cause my english is not perfect and it's
> actually 3 AM here :)
>
> Cheers,
> Vavelin Kevin
> Twitter | Blog | Viadeo
>
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