ReactiveSwift

Intro to ReactiveSwift

Transcript

1. Teddy Ku January 27, 2017 ReactiveSwift
2. What is • 2012: built for Github desktop app • Streams of values over time • Why? • ReactiveX: RxJava, Rx.NET • Reduce state, reduce bugs ReactiveCocoa
3. • 2016: ReactiveCocoa split -> ReactiveSwift and ReactiveCocoa • Pure Swift rewrite • Type safety • Performance: didSet instead of What isReactiveSwift?
4. • UITextFieldDelegate? • UITextFieldTextDidChange notification? • textField.addTarget(self, action: #selector(textFieldDidChange),
5. Too much state
6. Signals = Events over time
7. Less state, less bugs
8. Signals
9. EMAIL PASSWORD PASSWORD BUTTON ENABLED bind Signals
10. T EMAIL PASSWORD PASSWORD BUTTON ENABLED foo@bar.com bind Signals
11. T T EMAIL PASSWORD PASSWORD BUTTON ENABLED foo@bar.com bind *************** Signals
12. T T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED foo@bar.com bind *************** *************** Signals
13. T T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED F TTF foo@bar.com bind *************** *************** Signals
14. T TTF T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED F TTF T foo@bar.com bind *************** *************** Signals
15. T TTF T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED F TTF T T TTT foo@bar.com bind *************** *************** Signals
16. T TTF T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED F TTF T T TTT Translate to ReactiveSwift 1. Take latest string values 2. Check if each is not empty 3. Combine latest booleans 4. Return true if all not empty
17. T TTF T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED F TTF T T TTT |> is equivalent to Translate to ReactiveSwift 1. Take latest string values 2. Check if each is not empty 3. Combine latest booleans 4. Return true if all not empty
18. Behavior is defined linearly and concisely
19. Live demo
20. 1. Take latest string values 2. Validate email and password 3. Validate passwords match 4. Combine all validation results 5. BUT: don’t show errors if all fields aren’t filled out yet Error Validation
21. Live demo
22. RxMarbles T TTF T T TTT EMAIL PASSWORD PASSWORD BUTTON ENABLED F TTF T T TTT HTTP://RXMARBLES.COM/#COMBINELATEST
23. Recap • Less state, less bugs • Define behavior linearly & concisely • Types: Signal, Event https://github.com/tkuichooseyou/ReactiveSwiftTalk
24. Bonus • Signals representing other async events • Network Requests • Loading from disk • Sockets - real time updates • Throttle • Retry • Cancel network requests