Rupert  Beatty

Rupert Beatty

1665721320

RxSwift: Reactive Programming in Swift

RxSwift

Rx is a generic abstraction of computation expressed through Observable<Element> interface, which lets you broadcast and subscribe to values and other events from an Observable stream.

RxSwift is the Swift-specific implementation of the Reactive Extensions standard.

RxSwift Observable Example of a price constantly changing and updating the app's UI

While this version aims to stay true to the original spirit and naming conventions of Rx, this project also aims to provide a true Swift-first API for Rx APIs.

Cross platform documentation can be found on ReactiveX.io.

Like other Rx implementations, RxSwift's intention is to enable easy composition of asynchronous operations and streams of data in the form of Observable objects and a suite of methods to transform and compose these pieces of asynchronous work.

KVO observation, async operations, UI Events and other streams of data are all unified under abstraction of sequence. This is the reason why Rx is so simple, elegant and powerful.

I came here because I want to ...

... understand

... install

... hack around

... interact

... compare

... understand the structure

RxSwift is as compositional as the asynchronous work it drives. The core unit is RxSwift itself, while other dependencies can be added for UI Work, testing, and more.

It comprises five separate components depending on each other in the following way:

┌──────────────┐    ┌──────────────┐
│   RxCocoa    ├────▶   RxRelay    │
└───────┬──────┘    └──────┬───────┘
        │                  │        
┌───────▼──────────────────▼───────┐
│             RxSwift              │
└───────▲──────────────────▲───────┘
        │                  │        
┌───────┴──────┐    ┌──────┴───────┐
│    RxTest    │    │  RxBlocking  │
└──────────────┘    └──────────────┘
  • RxSwift: The core of RxSwift, providing the Rx standard as (mostly) defined by ReactiveX. It has no other dependencies.
  • RxCocoa: Provides Cocoa-specific capabilities for general iOS/macOS/watchOS & tvOS app development, such as Shared Sequences, Traits, and much more. It depends on both RxSwift and RxRelay.
  • RxRelay: Provides PublishRelay, BehaviorRelay and ReplayRelay, three simple wrappers around Subjects. It depends on RxSwift.
  • RxTest and RxBlocking: Provides testing capabilities for Rx-based systems. It depends on RxSwift.

Usage

Here's an exampleIn Action
Define search for GitHub repositories ...
let searchResults = searchBar.rx.text.orEmpty    .throttle(.milliseconds(300), scheduler: MainScheduler.instance)    .distinctUntilChanged()    .flatMapLatest { query -> Observable<[Repository]> in        if query.isEmpty {            return .just([])        }        return searchGitHub(query)            .catchAndReturn([])    }    .observe(on: MainScheduler.instance)
... then bind the results to your tableview
searchResults    .bind(to: tableView.rx.items(cellIdentifier: "Cell")) {        (index, repository: Repository, cell) in        cell.textLabel?.text = repository.name        cell.detailTextLabel?.text = repository.url    }    .disposed(by: disposeBag)

Requirements

  • Xcode 12.x
  • Swift 5.x

For Xcode 11 and below, use RxSwift 5.x.

Installation

RxSwift doesn't contain any external dependencies.

These are currently the supported installation options:

Manual

Open Rx.xcworkspace, choose RxExample and hit run. This method will build everything and run the sample app

CocoaPods

# Podfile
use_frameworks!

target 'YOUR_TARGET_NAME' do
    pod 'RxSwift', '6.5.0'
    pod 'RxCocoa', '6.5.0'
end

# RxTest and RxBlocking make the most sense in the context of unit/integration tests
target 'YOUR_TESTING_TARGET' do
    pod 'RxBlocking', '6.5.0'
    pod 'RxTest', '6.5.0'
end

Replace YOUR_TARGET_NAME and then, in the Podfile directory, type:

$ pod install

XCFrameworks

Each release starting with RxSwift 6 includes *.xcframework framework binaries.

Simply drag the needed framework binaries to your Frameworks, Libraries, and Embedded Content section under your target's General tab.

Note: If you're using RxCocoa, be sure to also drag RxCocoaRuntime.xcframework before importing RxCocoa.

XCFrameworks instructions

Carthage

Add this to Cartfile

github "ReactiveX/RxSwift" "6.5.0"
$ carthage update

Carthage as a Static Library

Carthage defaults to building RxSwift as a Dynamic Library.

If you wish to build RxSwift as a Static Library using Carthage you may use the script below to manually modify the framework type before building with Carthage:

carthage update RxSwift --platform iOS --no-build
sed -i -e 's/MACH_O_TYPE = mh_dylib/MACH_O_TYPE = staticlib/g' Carthage/Checkouts/RxSwift/Rx.xcodeproj/project.pbxproj
carthage build RxSwift --platform iOS

Swift Package Manager

Note: There is a critical cross-dependency bug affecting many projects including RxSwift in Swift Package Manager. We've filed a bug (SR-12303) in early 2020 but have no answer yet. Your mileage may vary. A partial workaround can be found here.

Create a Package.swift file.

// swift-tools-version:5.0

import PackageDescription

let package = Package(
  name: "RxTestProject",
  dependencies: [
    .package(url: "https://github.com/ReactiveX/RxSwift.git", .exact("6.5.0"))
  ],
  targets: [
    .target(name: "RxTestProject", dependencies: ["RxSwift", "RxCocoa"])
  ]
)
$ swift build

To build or test a module with RxTest dependency, set TEST=1.

$ TEST=1 swift test

Manually using git submodules

  • Add RxSwift as a submodule
$ git submodule add git@github.com:ReactiveX/RxSwift.git
  • Drag Rx.xcodeproj into Project Navigator
  • Go to Project > Targets > Build Phases > Link Binary With Libraries, click + and select RxSwift, RxCocoa and RxRelay targets

References

Download Details:

Author: ReactiveX
Source Code: https://github.com/ReactiveX/RxSwift 
License: MIT license

#swift #ios #reactive 

What is GEEK

Buddha Community

RxSwift: Reactive Programming in Swift
Houston  Sipes

Houston Sipes

1600430400

10 Free Online Resources To Learn Swift Language

Swift is a fast and efficient general-purpose programming language that provides real-time feedback and can be seamlessly incorporated into existing Objective-C code. This is why developers are able to write safer, more reliable code while saving time. It aims to be the best language that can be used for various purposes ranging from systems programming to mobile as well as desktop apps and scaling up to cloud services.

Below here, we list down the 10 best online resources to learn Swift language.

(The list is in no particular order)

#developers corner #free online resources to learn swift language #learn swift #learn swift free #learn swift online free #resources to learn swift #swift language #swift programming

Top Swift Development Companies | Top Swift Developers - TopDevelopers.co

A thoroughly researched list of top Swift developers with ratings & reviews to help find the best Swift development companies around the world.

#swift development service providers #best swift development companies #top swift development companies #swift development solutions #top swift developers #swift

Hire Dedicated Swift Developers

Want to create a native iOS application for your Startup?

Hire Dedicated Swift Developers for end-to-end services like development, migration, upgrade, testing, and support & maintenance. Trust HourlyDeveloper.io our Swift development team for iOS device apps that are high on performance and security.

Consult with experts:- https://bit.ly/2C5M6cz

#hire dedicated swift developers #swift developers #swift development company #swift development services #swift development #swift

4 Fun Reasons to Avoid Using “Primitive” Swift Types in Your Code

Here is a list of four fun reasons you should avoid using data types such as Int and String to pass along and process the data in your Swift code. And a list of alternatives to use instead, so you can write much better code with just a few small changes to your current habits.

Note: I’ll troll around a bit because technical articles can be boring.

Note that I use the word Fun in a slightly sarcastic way, as in: “Losing is Fun”.

1. Primitive types aren’t documenting your code

When you see a function definition like this one, do you instantly know what both of the String will actually be?

func getData(for identifier: String) -> String {

Here, String can be anything, both the input String and the output String. If you’re developing the code alone, you will probably remember what is the typical content of those two.

I say probably, because as any developer knows — by Monday you may not remember what the code written on Friday does. It’s something I can promise you. Give this project a few months of a break and it will be easier for you to write the thing from scratch than to try to understand “what the poet had in mind”.

To (try to) ensure the inputs and outputs stay at least a bit clear, you will need to add comments to explain the details of what you expect those Strings to actually contain.

From the above function definition alone we only know we’re looking for some identifier. We may understand from the context of the app what that may be, but what is the result of this function exactly?

Will it give us some kind of person’s name? Or maybe a large chunk of JSON data? Maybe a specific number of animal emojis such as a 🐐 and a 🐠? For no reason. But a String can be all those, so make sure that your code will handle every possible case now. I think you see my point.

In reality, nobody knows what those are until they check the actual code of the function.

We have powerful IDEs (such as Xcode), which provide developers with previews of possible completions. They are useless in this case. Imagine what you would think if you were working on someone else’s code and you stumbled upon the above definition as an Xcode suggestion. My guess is: some rude words will be included in your reaction.

You can’t understand what is happening until you check the code or documentation. And chances are, if you see this kind of String usage, you won’t find any docs for that package or pod or repository. **And also, most docs can’t be trusted because we don’t like to write docs, maintain docs and keep up with the changes in the code. **There is nothing that would force developers to keep the docs and comments in sync.

#swift #swift-programming #programming-languages #ios-app-development #programming

Rowena  Waters

Rowena Waters

1662005160

RxSwift: Reactive Programming in Swift

Rx is a generic abstraction of computation expressed through Observable<Element> interface, which lets you broadcast and subscribe to values and other events from an Observable stream.

RxSwift is the Swift-specific implementation of the Reactive Extensions standard.

RxSwift Observable Example of a price constantly changing and updating the app's UI

While this version aims to stay true to the original spirit and naming conventions of Rx, this projects also aims to provide a true Swift-first API for Rx APIs.

Cross platform documentation can be found on ReactiveX.io.

Like other Rx implementation, RxSwift's intention is to enable easy composition of asynchronous operations and streams of data in the form of Observable objects and a suite of methods to transform and compose these pieces of asynchronous work.

KVO observation, async operations, UI Events and other streams of data are all unified under abstraction of sequence. This is the reason why Rx is so simple, elegant and powerful.

I came here because I want to ...

... understand

... install

... hack around

... interact

... compare

... understand the structure

RxSwift is as compositional as the asynchronous work it drives. The core unit is RxSwift itself, while other dependencies can be added for UI Work, testing, and more.

It comprises five separate components depending on each other in the following way:

┌──────────────┐    ┌──────────────┐
│   RxCocoa    ├────▶   RxRelay    │
└───────┬──────┘    └──────┬───────┘
        │                  │        
┌───────▼──────────────────▼───────┐
│             RxSwift              │
└───────▲──────────────────▲───────┘
        │                  │        
┌───────┴──────┐    ┌──────┴───────┐
│    RxTest    │    │  RxBlocking  │
└──────────────┘    └──────────────┘
  • RxSwift: The core of RxSwift, providing the Rx standard as (mostly) defined by ReactiveX. It has no other dependencies.
  • RxCocoa: Provides Cocoa-specific capabilities for general iOS/macOS/watchOS & tvOS app development, such as Shared Sequences, Traits, and much more. It depends on both RxSwift and RxRelay.
  • RxRelay: Provides PublishRelay, BehaviorRelay and ReplayRelay, three simple wrappers around Subjects. It depends on RxSwift.
  • RxTest and RxBlocking: Provides testing capabilities for Rx-based systems. It depends on RxSwift.

Usage

Here's an exampleIn Action
Define search for GitHub repositories ...
let searchResults = searchBar.rx.text.orEmpty    .throttle(.milliseconds(300), scheduler: MainScheduler.instance)    .distinctUntilChanged()    .flatMapLatest { query -> Observable<[Repository]> in        if query.isEmpty {            return .just([])        }        return searchGitHub(query)            .catchAndReturn([])    }    .observe(on: MainScheduler.instance)
... then bind the results to your tableview
searchResults    .bind(to: tableView.rx.items(cellIdentifier: "Cell")) {        (index, repository: Repository, cell) in        cell.textLabel?.text = repository.name        cell.detailTextLabel?.text = repository.url    }    .disposed(by: disposeBag)

Requirements

  • Xcode 12.x
  • Swift 5.x

For Xcode 11 and below, use RxSwift 5.x.

Installation

RxSwift doesn't contain any external dependencies.

These are currently the supported installation options:

Manual

Open Rx.xcworkspace, choose RxExample and hit run. This method will build everything and run the sample app

CocoaPods

# Podfile
use_frameworks!

target 'YOUR_TARGET_NAME' do
    pod 'RxSwift', '6.5.0'
    pod 'RxCocoa', '6.5.0'
end

# RxTest and RxBlocking make the most sense in the context of unit/integration tests
target 'YOUR_TESTING_TARGET' do
    pod 'RxBlocking', '6.5.0'
    pod 'RxTest', '6.5.0'
end

Replace YOUR_TARGET_NAME and then, in the Podfile directory, type:

$ pod install

XCFrameworks

Each release starting with RxSwift 6 includes *.xcframework framework binaries.

Simply drag the needed framework binaries to your Frameworks, Libraries, and Embedded Content section under your target's General tab.

Note: If you're using RxCocoa, be sure to also drag RxCocoaRuntime.xcframework before importing RxCocoa.

XCFrameworks instructions

Carthage

Add this to Cartfile

github "ReactiveX/RxSwift" "6.5.0"
$ carthage update

Carthage as a Static Library

Carthage defaults to building RxSwift as a Dynamic Library.

If you wish to build RxSwift as a Static Library using Carthage you may use the script below to manually modify the framework type before building with Carthage:

carthage update RxSwift --platform iOS --no-build
sed -i -e 's/MACH_O_TYPE = mh_dylib/MACH_O_TYPE = staticlib/g' Carthage/Checkouts/RxSwift/Rx.xcodeproj/project.pbxproj
carthage build RxSwift --platform iOS

Swift Package Manager

Note: There is a critical cross-dependency bug affecting many projects including RxSwift in Swift Package Manager. We've filed a bug (SR-12303) in early 2020 but have no answer yet. Your mileage may vary. A partial workaround can be found here.

Create a Package.swift file.

// swift-tools-version:5.0

import PackageDescription

let package = Package(
  name: "RxTestProject",
  dependencies: [
    .package(url: "https://github.com/ReactiveX/RxSwift.git", .exact("6.5.0"))
  ],
  targets: [
    .target(name: "RxTestProject", dependencies: ["RxSwift", "RxCocoa"])
  ]
)
$ swift build

To build or test a module with RxTest dependency, set TEST=1.

$ TEST=1 swift test

Manually using git submodules

  • Add RxSwift as a submodule
$ git submodule add git@github.com:ReactiveX/RxSwift.git
  • Drag Rx.xcodeproj into Project Navigator
  • Go to Project > Targets > Build Phases > Link Binary With Libraries, click + and select RxSwift, RxCocoa and RxRelay targets

References


Download Details:

Author: ReactiveX
Source code: https://github.com/ReactiveX/RxSwift

License: MIT license
#swift #RxSwift