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[iOS] Swift 界 Then 的作者又一力作，RxTodo 教你如何进阶 RxSwift 和 MVVM

RxTodo

RxTodo is an iOS application developed usingRxSwift and MVVM design pattern. This project is for whom having trouble with learning RxSwift and MVVM due to lack of references. (as I did :grin: )

Features

MVVM design pattern
UsingRxDataSources
Observing model create/update/delete across the view controllers
Navigating between view controllers
Immutable models and view models

Philisophy

View doesn't have control flow. View cannot modify the data. View only knows how to map the data.

Bad

viewModel.title     .map { $0 + "!" } // Bad: View should not modify the data     .bindTo(self.titleLabel)

Good

viewModel.title     .bindTo(self.titleLabel)

View doesn't know what ViewModel does. View can only communicate to ViewModel about what View did.

Bad

viewModel.login() // Bad: View should not know what ViewModel does (login)

Good

self.loginButton.rx_tap     .bindTo(viewModel.loginButton)     // "Hey I clicked the login button"  self.usernameInput.rx_controlEvent(.EditingDidEndOnExit)     .bindTo(viewModel.usernameInputDidReturn)     // "Hey I tapped the return on username input"

Model is hidden by ViewModel. ViewModel only exposes the minimum data so that View can render.

Bad

class ProductViewModel {     let product: Driver<Product> // Bad: ViewModel should hide Model }

Good

class ProductViewModel {     let productName: Driver<String>     let formattedPrice: Driver<String>     let formattedOriginalPrice: Driver<String>     let originalPriceHidden: Driver<Bool> }