漫談 iOS 架構：MVC / MVVM / VIPER 與 Redux - Nelson
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{%hackmd FGRWt1UuTFKk0wSbGgg-SA %}

> 請從這裡開始

## YouTube
{%youtube qDyb6AkX0s0%}

## Slide
[{%slideshare nelson0805/common-ios-architecture-from-mvc-to-viper-with-redux %}](https://)

[文字稿在這裡](https://chiahsien.github.io/post/common-ios-architecture-from-mvc-to-viper-with-redux/)

[TOC]

## Why this topic?
通常是接手別人的 code

團隊成員變多之後要如何應對與維護

from startup found buggy code

all articles start with "mvc sucks" without any reason

## From MVC to VIPER

* Series of refactoring
* Pick one that suit your team
* 不一定哪一種比較好
### MVC


Model
- Data structdfive view controller

con<font color=red>**troll**</font>er

### 如何解決 MASSIVE VIEW CONTROLLER
#### MVP and MVVM


Presenter / ViewModel
- API
- business logic
- data conversion
- data source

重點在於將不屬於 viewController 的事情拆解出來
可以是 presenter 的 MVP or viewModel 的 MVVM

MVP ≈ MVVM

MVVM: 利用 data binding(ex: RxSwift, combine)更新 model
MVP: 利用 block, delegate 更新 model

Weakness:
- Hard to reuse
- Lack of flexibility
- Hard to cowork
- conflict in storyboard when coworking

### UI Navigation Solution ~~ Coordinator


* coordinator: 可以想成一組 module / feature 的入口
* VC 間應該互相獨立，靠 coordinator 做聯繫

* Coordinator
* Create and setup VCs
* Manage VC's flow
* Manage child cooridinators
* 只負責 UI Navigation


### VIPER
> every project will end up as viper, maybe

Model => Entity
View
Presenter
Coordinator=> Router
Manager/Service => Interactor
就是 VIP

MVC -> VIPER：就是不停 Refactoring。

## State Management
上吧 singleton （GG），但如果不想用這種方式的話呢？

## Redux

[ReSwift](https://github.com/ReSwift/ReSwift) just copy from front-End, almost the same 🤬🤬🤬🤬🤬
* A state management framework
* Single source of truth
* Single place to modify state (只有一個(人)可以修改)
* Unidirctional data flow (單向資料流)

Reducer: 判斷 state 的地方

redux in viper: `interactor + entity`
## Summary
* A series of refactoring
* Find a pattern that suit your team
* Both VM and Presenter are great
* 👍**Recommend Coordinator for beginner** (很推薦，效果好，技術門檻低，可以融入其他架構)
* Manage state with care

## Others

「因為聽了 weak self 才知道這場」 +1, -1

> 本日經典名言：「資深工程師的生活就是這麽樸實無華，且枯燥。」


> Refactoring is usually motivated by noticing a code smell. - wiki [Code_refactoring](https://en.wikipedia.org/wiki/Code_refactoring)
>

聽完覺得是talk show 的 +1 -> 1

###### tags:`iPlayground2019`