Converting non-main runloop tasks to GCD
-
13-10-2019 - |
문제
I have a task that runs periodically and it was originally designed to run on a separate run loop than the main runloop using NSThread and NSTimer.
What's the best way to adapt this to take advantage of GCD?
Current code:
-(void)initiateSomeTask
{
[NSThread detachNewThreadSelector:@selector(startTimerTask)
toTarget:self withObject:nil];
}
-(void)startTimerTask
{
// We won't get back the main runloop since we're on a new thread
NSRunLoop *myRunLoop = [NSRunLoop currentRunLoop];
NSPort *myPort = [NSMachPort port];
[myRunLoop addPort:myPort forMode:NSDefaultRunLoopMode];
NSTimer *myTimer = [NSTimer timerWithTimeInterval:10 /* seconds */
target:self selector:@selector(doMyTaskMethod)
userInfo:nil repeats:YES];
[myRunLoop addTimer:myTimer forMode:NSRunLoopCommonModes];
[myRunLoop run];
}
Is there anything I can do besides replace detachNewThreadSelector
with dispatch_async
?
해결책
You can replace the use of NSTimer with use of dispatch_source_create with DISPATCH_SOURCE_TYPE_TIMER. You won't need a run loop then.
Back in the original case, though, you don't really need to make a thread or use dispatch to run a timer. Kind of the point of run loops is that you don't need to make a thread to do something simple like a timer.
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