Meituan Technology Team

Jul 16, 2015 · Mobile Development

Understanding RACSignal Subscription, Multicast, and Replay in ReactiveCocoa

The article breaks down RACSignal’s three‑step subscription flow, then explains how multicast and replay operators—built on RACSubject and RACReplaySubject—share a single source, buffer values, and ensure side‑effects like network requests execute only once regardless of how many subscribers attach.