I’ve had luck using dispatch queues to accomplish recurring events,
specifically dispatch_after. For example:
- (void) doStuffAfterDelay
{
dispatch_queue_t theQueue = dispatch_queue_create("Recurring work queue",
DISPATCH_QUEUE_SERIAL);
dispatch_time_t futureTime = dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 *
NSEC_PER_SEC));
dispatch_after(futureTime, theQueue,
^{
DoStuff();
[self doStuffAfterDelay];
;});
}
You can also use an NSTimer that repeats, such as:
NSTimeInterval delaySecs = 5;
self.timer = [NSTimer scheduledTimerWithTimeInterval:delaySecs
target:self selector:@selector(doStuff:)
userInfo:nil repeats:YES];
Hope this helps.
Doug Hill
> On May 13, 2016, at 12:34 PM, Carl Hoefs <newsli...@autonomy.caltech.edu>
> wrote:
>
> I want a method running on a background thread to reissue itself after it is
> done processing. How can I do this?
>
> I'm using the following code but it runs just once and is never heard from
> again...
>
> // initial invocation from main thread
> [self performSelectorInBackground:@selector(_checkSensor:) withObject:@50];
>
>
> // target method on background thread
> -(void)_checkSensor:(NSNumber *)delaySecs
> {
> // check sensor...
> // processing...
>
> // reschedule
> [NSObject cancelPreviousPerformRequestsWithTarget:self selector:_cmd
> object:nil];
> [self performSelector:_cmd withObject:nil afterDelay: delaySecs];
> }
>
> As a test, the above works if run on the main thread, so I'm guessing it has
> something to do with there being no runloop after the background thread
> exits.
> -Carl
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