Book Image

Swift High Performance

By : Kostiantyn Koval
Book Image

Swift High Performance

By: Kostiantyn Koval

Overview of this book

Swift is one of the most popular and powerful programming languages for building iOS and Mac OS applications, and continues to evolve with new features and capabilities. Swift is considered a replacement to Objective-C and has performance advantages over Objective-C and Python. Swift adopts safe programming patterns and adds modern features to make programming easier, more flexible, and more fun. Develop Swift and discover best practices that allow you to build solid applications and optimize their performance. First, a few of performance characteristics of Swift will be explained. You will implement new tools available in Swift, including Playgrounds and REPL. These will improve your code efficiency, enable you to analyse Swift code, and enhance performance. Next, the importance of building solid applications using multithreading concurrency and multi-core device architecture is covered, before moving on to best practices and techniques that you should utilize when building high performance applications, such as concurrency and lazy-loading. Finally, you will explore the underlying structure of Swift further, and learn how to disassemble and compile Swift code.
Table of Contents (15 chapters)
Swift High Performance
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Making a Swift application


The first step in creating a good application architecture is to create the application itself. We will be creating an iOS journal application used to make daily notes. We are not going to cover any iOS-specific topics, so you can use the same code and create OS X applications as well.

Go ahead! Open Xcode and create a new iOS single-view project application. Now, we are ready for coding.

First, let's create a Person type, for the owner of the journal, and a journal entry type. We will use the Class type to create both Person and JournalEntry. Both classes are very simple—just a bunch of properties and an initializer:

class Person {
  var firstName: String
  var lastName: String

  init (firstName: String, lastName: String) {
    self.firstName = firstName
    self.lastName = lastName
  }
 }

class JournalEntry {
  var title: String
  var text: String
  var date: NSDate
  
  init (title: String, text: String) {
    self.title = title
    self.text = text
    date...