Run NSTimer in background thread to call method on completion in main thread

Question

I have a static method that creates a NSTimer and runs it in the background thread, like so:

+ (void) callInBackgroundThread {
    NSTimer *timer = [NSTimer timerWithTimeInterval:0.2
                                            target:self
                                          selector:@selector(callToMainThread)
                                          userInfo:nil repeats:NO];
    [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
}

and then i call the main thread upon completion like so:

+ (void) callToMainThread{
    NSTimer *timer = [NSTimer timerWithTimeInterval:0
                                             target:self
                                           selector:@selector(foo1)
                                           userInfo:nil repeats:NO];
   [[NSRunLoop mainRunLoop] addTimer:timer forMode:NSDefaultRunLoopMode];
}

While this works i feel that this is quite sketchy and I wonder if there is a better way of doing this. I would appreciate suggestions, please note that the methods where are static.

Any help would be appreciated.

Regards

Answer 1

performSelectorOnMainThread:withObject:waitUntilDone: also works for classes!

+ (void) callToMainThread {
   [self performSelectorOnMainThread:@selector(foo1) withObject:nil waitUntilDone:NO];
}