Book Image

Reactive Programming with Swift

By : Cecil Costa
Book Image

Reactive Programming with Swift

By: Cecil Costa

Overview of this book

<p><span id="description" class="sugar_field">Reactive programming helps you write applications that are more powerful and efficient. You can write more software, help more people, and create applications that scale. Reactive programming is a growing paradigm that we will help you set to work in Swift.</span></p> <p><span class="sugar_field"><span id="description" class="sugar_field"> Reactive Programming with Swift guides you through migrating from the traditional way of developing to the new ReactiveCocoa framework, which uses Swift as its main programming language. You will learn how to develop with this framework, debug code, create unit tests, use additional frameworks, and convert a traditional framework into a ReactiveCocoa one.</span></span></p> <p><span class="sugar_field"><span id="description" class="sugar_field"><span id="description" class="sugar_field"> Starting with a crash course on the fundamental concepts of Reactive programming, we’ll set you up so you’re ready to create reactive applications. We’ll then move on to topics such as Graphical events, Streaming, and Core data, which will help you dive deeper with advanced programming. The concept of switching your programming concepts from imperative to functional reactive programming will also be covered. By the end of this book, you will be able to successfully create highly functional apps using Swift.</span> </span></span></p>

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Reactive Programming with Swift
Cecil Costa
Apr, 2016 | 238 pages
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Table of Contents (14 chapters)
Reactive Programming with Swift
Reactive Programming with Swift
Credits
Credits
About the Author
About the Author
About the Reviewer
About the Reviewer
www.PacktPub.com
www.PacktPub.com
Preface
Preface
Free Chapter
1
Introduction to Reactive Programming
Introduction to Reactive Programming
What is reactive programming?
Paradigms - declarative versus imperative
What is functional programming?
Swift - interactive, safe, and fast
The ReactiveCocoa project
The future of reactive programming
Summary
2
Installing ReactiveCocoa and Using It with Playground
Installing ReactiveCocoa and Using It with Playground
The ReactiveCocoa website
Exploring ReactiveCocoa
Installing ReactiveCocoa via CocoaPods
Using Playground
Summary
3
Performing UI Events with ReactiveCocoa
Performing UI Events with ReactiveCocoa
An overview of the project
Setting up the project
Creating a validator class
Validating text fields
Enabling and disabling the button
Using UIDatePicker
Selecting the gender of the user
Adding more information
Getting the right input type
Using bidirectional channels
Displaying your horoscope
Summary
4
Network and Change Propagation
Network and Change Propagation
Overviewing the project
Setting up the project
Searching for a movie
Filling in the table view
Model-View-ViewModel bindings
Displaying movie posters
Improving your code for a second scene
Filling in the movie form
Implementing the genre signal
Changing a few details in the first scene
Summary
5
Enhance Your Application Using RAC Extensions
Enhance Your Application Using RAC Extensions
An overview of the project
Setting up the project and installing extensions
Mocking up the first scene
Retrieving information from GPS
Taking pictures with a camera
Using gesture recognizers
Storing pictures
Storing coordinates
Showing coordinates
Summary
6
Using the ReactiveCocoa 4 Style
Using the ReactiveCocoa 4 Style
An overview of the project
Setting up the project
Developing the Currency class
Creating the Currency Manager
Creating the Product class
Implementing a shopping cart
Resuming the ViewController class
Creating the checkout scene
Testing the application
Summary
7
Testing Your Application
Testing Your Application
Checking the expected results
Creating unit tests
Testing the UI
Profiling with Instruments
Summary
8
Migrating a Real Application to ReactiveCocoa
Migrating a Real Application to ReactiveCocoa
Knowing the application
Creating a new framework
Replacing the airplane delegate
Reorganizing the signals
Checking the dark side
Splitting the signal again
Waiting for 10 seconds
Reversing the geolocation
Avoiding repeated calls
Summary

Using Playground

Since Swift was released, Xcode comes with a feature called Playground. This is used to test Swift code in real time in a way that allows you to see the results without the need to execute the whole application.

The advantage of using Playground is that it is much faster to test than if you create new applications or unit tests when you have small tasks, such as testing the result of a signal or mutable property.

In this section, we are going to use Playground to test the ReactiveCocoa framework.

Start by creating a new Single View Application called RAC Playground. As usual, check whether Swift is the main programming language for this project:

Choose your favorite way of installing ReactiveCocoa and then install it (time to practice!). Once everything is done, select the ReactiveCocoa project from Project Navigator (not your application), and add a playground to it by using the command + N shortcut in order to add a new file. When the dialog requesting you to choose a template...

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