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];
});
}
});
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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