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Swift Cookbook

You're reading from   Swift Cookbook Over 60 proven recipes for developing better iOS applications with Swift 5.3

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Product type Paperback
Published in Feb 2021
Publisher Packt
ISBN-13 9781839211195
Length 500 pages
Edition 2nd Edition
Languages
Tools
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Authors (3):
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Keith Moon Keith Moon
Author Profile Icon Keith Moon
Keith Moon
Keith D. Moon Keith D. Moon
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Keith D. Moon
Chris Barker Chris Barker
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Chris Barker
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Toc

Table of Contents (14) Chapters Close

Preface 1. Swift Building Blocks 2. Mastering the Building Blocks FREE CHAPTER 3. Data Wrangling with Swift Control Flow 4. Generics, Operators, and Nested Types 5. Beyond the Standard Library 6. Building iOS Apps with Swift 7. Swift Playgrounds 8. Server-Side Swift 9. Performance and Responsiveness in Swift 10. SwiftUI and Combine Framework 11. Using CoreML and Vision in Swift 12. About Packt 13. Other Books You May Enjoy

How it works...

In Step 1, we create our howLongUntilChristmas function, then in Step 2we get the currently set calendar and time zone as they will be needed for the date calculations to come:

let calendar = Calendar.current
let timeZone = TimeZone.current

While retrieving the current time zone is self-explanatory, it is not immediately obvious what the Calendar type represents and why we need to retrieve it.

How dates are represented is not as universally agreed as you might believe. Certain time components are mostly universal, such as the length of years and days, as they are connected to astronomical events, such as the time it takes for the Earth to perform one revolution of the Sun, and for the Earth to complete one rotation around its own axis, respectively. However, other time components, such as months and weeks and how the years are numbered, are rooted in the culture that created them.

The calendar used throughout Europe and most of the world is known as...
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