ReactiveCocoa interval (polling) signal

ReactiveIntervalPoller.m

    @weakify(self);

    RACSignal *timerSignal = [RACSignal
            interval:10 onScheduler:[RACScheduler mainThreadScheduler]];

    self.somethingSignal = [timerSignal
            map:^id(id value) {

                @strongify(self);
                return self.something;

            }];