woodycatliu

響應式編程 Reactive Programming

此篇將以 Swift 的角度去簡化 RP 理論的解釋

對於 iOS/OS 開發前端，這兩年很頻繁的會聽到這個名詞。
尤其是 Apple 推出 SwiftUI 與 Combine 以後，似乎 RxSwift 已經變成不是選修條件，越來越多公司在職缺條件中 Combine 或 RxSwift 是必要條件。
註：Combine/ RXSwift 是 RP 的高階封裝框架。

什麼是響應式編程(RP) ?

相信很多人 Google 之後會更加模糊，尤其是閱讀完 Wikipedia 艱深又空洞的理論介紹後，只看到一堆專業術語跟更多沒見過的名詞。

woodycatliu

Countdown Timer Publisher (Swift5.2)

In the past we had to set the countdown by Timer.TimePublisher.

We maybe coding to like bellow.

let timer = Timer.publish(every: 0.01, on: .main, in: .common)
    .autoconnect()
 .map { _ in return 0.01 }

woodycatliu

Redux and TCA Learning Record 2

---

Pervious ParseTCA, I created some encapsulation to reproduce how TCA to implement in binding to ViewStore and Store.

Today, I will try to refactor them to more complete, like composable action and flexibility.

Step 1.

Refocator Reducer

// refactor after: 

woodycatliu

Redux and TCA Learning Record 1

---

TCA

We can use Store and compose a new ViewStore to binding a smaller UI Block in subView or subViewController. How does TCA implements in binding each other ?

I crate some code to reproduce it.

Implement

woodycatliu

The Composable Architecture (可组装架构)

The Composable Architecture (简写为TCA) 让你用统一、便于理解的方式来搭建应用程序，它兼顾了组装，测试，以及功效。你可以在 SwiftUI，UIKit，以及其他框架，和任何苹果的平台（iOS、macOS、tvOS、和 watchOS）上使用 TCA。

• 什么是TCA?
• 更多
• 示例
• 基本用法
• 补充性的库
• 常见问题

woodycatliu

import Combine

extension Publisher where Self.Output: Encodable {
    
    func safeInUserDefaultFirst(_ key: String) -> AnyPublisher<Self.Output, Self.Failure> {
        return flatMap { (output)-> Just<Self.Output> in
            let data = try? JSONEncoder().encode(output)
            UserDefaults.standard.set(data, forKey: key)
            return Just(output)
        }.eraseToAnyPublisher()

woodycatliu

//
//  KitProviderLayout.swift
//
//  Created by Woody on 2022/2/11.
//

import UIKit

#if canImport(SwiftUI) && DEBUG
class ViewLayout {

woodycatliu

//
//  KitProviderLayout.swift
//
//  Created by Woody on 2022/2/11.
//

import UIKit

#if canImport(SwiftUI) && DEBUG
class ViewLayout {

woodycatliu

//  DownsampingImageView
//
//  Created by Woody on 2022/1/28.
//

import UIKit

fileprivate var WidthScale: (_ r: CGFloat, _ l: CGFloat)-> CGFloat = {
    return Scale($0, $1)
}

woodycatliu

Swift 5.3 Combine

With RxSwift, it can support bind to a function/closure to more readability.

Example

textField.rx.text.orEmpty.asObservable()
            .subscribeOn(MainScheduler.instance)
            .bind(onNext: receiveText(_:))
 .disposed(by: disBag)