Book Image

Mastering macOS Programming.

By : Gregory Casamento
Book Image

Mastering macOS Programming.

By: 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

Presenting open and save dialog boxes


Before we wrap up this chapter, let's look at offering the user a way to choose the location in which a file is to be saved, and to load a file from any location in the file hierarchy.

This goes beyond what is included in the Foundation framework; we need Cocoa, so we need to modify the CustomFileManager  import statement as follows:

import Cocoa 

Creating the Open dialog box could hardly be easier. Add the following method to the CustomFileManager class, using a new extension:

extension CustomFileManager 
{ 

  func openFile() -> URL? 
  { 
    let myFileDialog = NSOpenPanel() 
    myFileDialog.runModal() 
    return myFileDialog.url 
  }  

} 

As you can see, this returns the URL of the file chosen by the user.

The dialog box should look familiar:

Note that there is no New Folder button, because we are searching for a file, not saving one. Also note that the Open button is grayed out as long as a directory is selected. This is also because we are searching...