Blocks instead of performSelector:withObject:afterDelay:

Question

I often want to execute some code a few microseconds in the future. Right now, I solve it like this:

- (void)someMethod
{
    // some code
}

And this:

[self performSelector:@selector(someMethod) withObject:nil afterDelay:0.1];

It works, but I have to create a new method every time. Is it possible to use blocks instead of this? Basically I'm looking for a method like:

[self performBlock:^{
    // some code
} afterDelay:0.1];

That would be really useful to me.

user_220847 · Answer

Here's a simple technique, based on GCD, that I'm using:

void RunBlockAfterDelay(NSTimeInterval delay, void (^block)(void))
{
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC*delay),
      dispatch_get_current_queue(), block);
}

I'm not a GCD expert, and I'd be interested in comments on this solution.

Blocks instead of performSelector:withObject:afterDelay:

6 Answers