Book Image

Mastering macOS Programming.

By : Stuart Grimshaw, Gregory Casamento
Book Image

Mastering macOS Programming.

By: Stuart Grimshaw, Gregory Casamento

Overview of this book

macOS continues to lead the way in desktop operating systems, with its tight integration across the Apple ecosystem of platforms and devices. With this book, you will get an in-depth knowledge of working on macOS, enabling you to unleash the full potential of the latest version using Swift 3 to build applications. This book will help you broaden your horizons by taking your programming skills to next level. The initial chapters will show you all about the environment that surrounds a developer at the start of a project. It introduces you to the new features that Swift 3 and Xcode 8 offers and also covers the common design patterns that you need to know for planning anything more than trivial projects. You will then learn the advanced Swift programming concepts, including memory management, generics, protocol orientated and functional programming and with this knowledge you will be able to tackle the next several chapters that deal with Apple’s own Cocoa frameworks. It also covers AppKit, Foundation, and Core Data in detail which is a part of the Cocoa umbrella framework. The rest of the book will cover the challenges posed by asynchronous programming, error handling, debugging, and many other areas that are an indispensable part of producing software in a professional environment. By the end of this book, you will be well acquainted with Swift, Cocoa, and AppKit, as well as a plethora of other essential tools, and you will be ready to tackle much more complex and advanced software projects.
Table of Contents (28 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Dedication
Preface
18
LLDB and the Command Line

Customizing operators


In addition to the operators provided by the Swift language, we can both override existing operators and, where necessary, create new ones.

Adding operator implementations to types

This sounds so complicated, but it is, in fact, really easy. All we need to do is define an implementation of any given operator for any given type.

Note

For the time being, we'll use a custom type, although what we are doing can be used equally effectively for Swift and Cocoa types.

We'll start by defining a custom type:

struct GridMovement 
{ 
  let rows: Int 
  let cols: Int 
} 

Now that we have it, we notice that it would make perfect sense to be able to apply some basic arithmetical operators to our type. We could add these to the main type declaration, but convention (young though it is) suggests we put it in an extension:

extension GridMovement 
{ 
  static func + (lhs: GridMovement, 
                 rhs: GridMovement) -> GridMovement 
  { 
    let rows = lhs.rows + rhs.rows 
    let cols...