Don't trigger RACSignal side effects until it has completed - ios

Question

I'm trying to create signal that will trigger it side effects on first subscription, and replay events for any further subscriptions. Once the signal sends complete or error I would like to re trigger side effect for next subscription. I've come up with this as solution, but I'm wondering if there is more elegant way to solve this.
#interface ViewController ()
#property (nonatomic, assign) NSUInteger counter;
#property (nonatomic, strong) RACSignal *defferedIncrement;
#end
#implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[[self defferedIncrement] subscribeNext:^(id x) {
NSLog(#"Count: %#", x);
}];
[[self defferedIncrement] subscribeNext:^(id x) {
NSLog(#"Count: %#", x);
}];
}
- (IBAction)buttonDidTap:(id)sender {
[[self defferedIncrement] subscribeNext:^(id x) {
NSLog(#"Count: %#", x);
}];
}
- (RACSignal *)realIncrement
{
return [RACSignal createSignal:^RACDisposable *(id<RACSubscriber> subscriber) {
RACDisposable *disposable = [RACDisposable new];
if (disposable.disposed) { return disposable; }
++self.counter;
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(3 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
[subscriber sendNext:#(self.counter)];
[subscriber sendCompleted];
});
return disposable;
}];
}
- (RACSignal *)defferedIncrement
{
if (!_defferedIncrement) {
_defferedIncrement = [[RACSignal defer:^RACSignal *{
return [[self realIncrement] finally:^{
_defferedIncrement = nil;
}];
}] replayLazily];
}
return _defferedIncrement;
}
#end