Using Hooks in iOS App Development CA.swift #14

Introduction ・Takuma Osada ・CyberAgent 21 New Grad ・GitHub: @ostk0069 ・Twitter: @ostk0069

Agenda 1. Simple Conclusion 2. What’s Hooks? 3. Introduction of Hooks API 4. Advantages & Drawbacks 5. Final Conclusion

Agenda 🙅 Deep Look in SwiftUI-Hooks Codes

Simple Conclusion

Simple Conclusion Not 👎 but also not 😆

Simple Conclusion This is just my opinion 😓

What’s Hooks?

What’s Hooks? Hooks are a new addition in React 16.8. (Feb 2019) They let you use state and other React features without writing a class. React Hooks API Reference

What’s Hooks? YouTube: React Today and Tomorrow and 90% Cleaner with React Hooks 🔥 Wrapper Hell 📦 Huge Components 😓 Confusing Classes Hooks Solves...

What’s Hooks? SwiftUI-Hooks Released 0.0.1 by ra1028 (May 2021) ra1028/SwiftUI-Hooks

What’s Hooks? Hooks also used in Flutter as well rrousselGit/flutter_hooks

Introduction of Hooks API

Introduction of Hooks API ・useState ・useEffect ・useLayoutEffect ・useMemo ・useRef ・useReducer ・useEnvironment ・usePublisher ・usePublisherSubscribe ・useContext

Introduction of Hooks API ・useState ・useEffect ・useLayoutEffect ・useMemo ・useRef ・useReducer ・useEnvironment ・usePublisher ・usePublisherSubscribe ・useContext

Introduction of Hooks API useState A hook to use a Binding wrapping current state to be updated by setting a new state to wrappedValue. Triggers a view update when the state has been changed.

Introduction of Hooks API useState SwiftUI + Hooks SwiftUI

Introduction of Hooks API useEffect A hook to use a side effect function that is called the number of times according to the strategy specified by computation. Optionally the function can be cancelled when this hook is unmount from the view tree or when the side-effect function is called again. Note that the execution is deferred until after all the hooks have been evaluated.

Introduction of Hooks API useEffect SwiftUI SwiftUI + Hooks

Introduction of Hooks API useRef A hook to use a mutable ref object storing an arbitrary value. The essential of this hook is that setting a value to current doesn't trigger a view update.

Introduction of Hooks API useRef SwiftUI + Hooks SwiftUI

Introduction of Hooks API usePublisher A hook to use the most recent status of asynchronous operation of the passed publisher. The publisher will be subscribed at the first computation and will be re-subscribed according to the strategy specified with the passed computation. Triggers a view update when the asynchronous status has been changed.

Introduction of Hooks API usePublisher SwiftUI + Hooks SwiftUI

Advantages & Drawbacks

Advantages & Drawbacks Advantages ✔ Less Codes, Less Classes & Struct ✔ Linter works on Top Level Codings ✔ Enable to use Minimum & Partial

Advantages & Drawbacks Drawbacks ✖ Very few Documents & Samples ✖ More cost for Learnings ✖ Compared with React & Flutter, Insufficient Conclusive to use ✖ Existence of The Composable Architecture

Final Conclusion

Final Conclusion Not 👎 but also not 😆 ↓ Lots of benefits using Hooks in React & Flutter. How about using in SwiftUI...?

Appendix https://github.com/ra1028/SwiftUI-Hooks https://reactjs.org/docs/hooks-intro.html https://reactjs.org/docs/hooks-reference.html https://pub.dev/packages/flutter_hooks https://logmi.jp/tech/articles/324180

Thanks ✌ CA.swift #14