This document summarizes RxSwift operators for connecting multiple observers to a shared data stream ("hot" observables) such as multicast, publish, replay, connect, refCount, share, and shareReplay. It explains how these operators work, including how they transform "cold" observables into "hot" observables that can be subscribed to multiple times, how they manage subscriptions and sharing of values, and provides examples of how to use these operators in RxSwift.

1. Hot
@ RxSwift

2. https://speakerdeck.com/ukitaka/cold-at-she-nei-rxswiftmian-qiang-hui

3. Hot

4. Cold → Hot

5. ( )Hot
Hot
Hot
• multicast / publish
• replay / replayAll
• connect / refCount
• share / shareReplay
• shareReplayLatestWhileConnected

7. publish()

8. Question1

10. 1,2,3

11. Sequence Map Hot
subscribe

12. Sequence Map Hot
subscribe

13. Answer
…

14. A.

15. !?

16. ( )Hot
Hot
Hot
• multicast / publish
• replay / replayAll
• connect / refCount
• share / shareReplay
• shareReplayLatestWhileConnected

17. Hot 1
ConnectableObservable

18. publish() …

19. ConnectableObservable
• connect()
• connect() Hot
• connect() Observer

20. ConnectableObservable

21. • observer Hot
connect()
observer subscribe

22. (ConnectableObservable )

23. ConnectableObservable Operator
• multicast()
• publish()
• replay(bufferSize:)
• replayAll()

24. multicast()
• Hot Subject
• multicast() Subject
Operator

25. multicast()

26. publish()
• PublishSubject multicast

27. • ReplaySubject multicast
replay(bufferSize:) / replayAll()

28. ConnectableObservable
• Cold Observable multicast() /
publish() / replay(bufferSize:) / replayAll()
ConnectableObservable
• ConnectableObservable connect()
Hot Observable

29. …

30. ConnectableObservable

31. Hot Operator

32. ( )Hot
Hot
Hot
• multicast / publish
• replay / replayAll
• connect / refCount
• share / shareReplay
• shareReplayLatestWhileConnected

33. share()

34. share()
ConnectableObservable
Observable
Hot

35. Question2

37. Answer
…

38. A.

39. ) ?

40. Hot 2
: RefCount

41. share()

42. refCount()
• refCount() ConnectableObservable
Operator

43. refCount()
• Hot
• Hot subscribe
refCount
Hot subscribe

44. refCount()
• subscribe
connect()

45. Question3

47. Answer
…

48. A. 1,2,3

49. Hot
( )

50. Operator

51. shareReplay(bufferSize:)
• share + replay
• share = publish + refCount
• shareReplay = publish + refCount + replay
• Hot subscribe
replay

52. shareReplay(bufferSize:)
• RxSwift Example
•
shareReplay(1) (
)
• RxSwift v2.5.0 shareReplay 1
share

53. shareReplayLatestWhileConnected()
•
•
RxSwift(RxCocoa) Driver
• ShareReplay1 connect
1 .Completed replay
.Completed
• Driver

54. Hot
Hot
• ConnectableObservable connect()
• RefCount 1 subscribe