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Jayant Varma - SwiftUI for Absolute Beginners

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SwiftUI for Absolute Beginners
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Jayant Varma
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Apress
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Dive into the world of developing for all of Apple platforms with SwiftUI, Apples new framework that makes writing applications faster and easier with fewer lines of code. This book teaches the basics of SwiftUI to help you write amazing native applications using XCode.
For developers already familiar with ReactNative, this book reviews the declarative, state-based DSL that manages the UI and updates it automatically will feel just like what theyre used to. Youll see how SwiftUI reduces the number of lines of code required to achieve the same effects by over 60% and provides a much better experience.
Like the announcement of Swift in 2014, SwiftUI is expected to fundamentally change the way developing programmers approach coding iPhone and iPad applications. This book examines how SwiftUI lowers the entry barrier for developers to write amazing cross-platform applications for iOS and iPadOS as well as WatchOS, Mac OS, and TVOS.
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Jayant Varma

SwiftUI for Absolute Beginners

Program Controls and Views for iPhone, iPad, and Mac Apps

Jayant Varma

Melbourne, VIC, Australia

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub via the books product page, located at www.apress.com/978-1-4842-5515-5 . For more detailed information, please visit http://www.apress.com/source-code .

ISBN 978-1-4842-5515-5 e-ISBN 978-1-4842-5516-2

https://doi.org/10.1007/978-1-4842-5516-2

Jayant Varma 2019

This work is subject to copyright. All rights are reserved by the Publisher, whether the whole or part of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed.

Trademarked names, logos, and images may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, logo, or image we use the names, logos, and images only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. The use in this publication of trade names, trademarks, service marks, and similar terms, even if they are not identified as such, is not to be taken as an expression of opinion as to whether or not they are subject to proprietary rights.

While the advice and information in this book are believed to be true and accurate at the date of publication, neither the authors nor the editors nor the publisher can accept any legal responsibility for any errors or omissions that may be made. The publisher makes no warranty, express or implied, with respect to the material contained herein.

Distributed to the book trade worldwide by Springer Science+Business Media New York, 233 Spring Street, 6th Floor, New York, NY 10013. Phone 1-800-SPRINGER, fax (201) 348-4505, e-mail orders-ny@springer-sbm.com, or visit www.springeronline.com. Apress Media, LLC is a California LLC and the sole member (owner) is Springer Science + Business Media Finance Inc (SSBM Finance Inc). SSBM Finance Inc is a Delaware corporation.

This book is dedicated to my parents

Acknowledgments

Writing a book is not exactly an easy task and more so when the technology is new and does not have a lot of information available. This has been a challenging journey also given the fact that every fortnight there were changes to the API that broke some of the earlier code or changed the way something was done. This book could be completed due to the support by my family, more so my lovely wife Monica who has supported me pulling late nighters and weekends trying out new features of SwiftUI and making sure that it all works and remains current.

A special thanks to my parents that always believed in me and to that effect this is going to be my 7th published book.

Thanks also to Aaron and Jessica at Apress, reaching out to Aaron for a new book pitch and get this process started was quite easy, he got things organised even while he was travelling and responded between his flights. Thanks to Jessica, who as usual made the process easy and a breeze and for all the quick responses and support at all aspects of the process.

Thanks to the Technical reviewer to go through the text and code and highlight the little changes that were missed and special thanks to the team that made this wonderful framework at Apple.

Table of Contents

About the Author and About the Technical Reviewer

About the Author

Jayant Varma

is a Developer, Consultant and author that has over 25 years of experience in developing and delivering applications, of which the last decade was focussed solely on iOS. He has worked on many iOS applications that span indie games to Enterprise level applications used by several users from the App store and via Enterprise builds. He loves to be hands on, being closer to the code and manages teams of iOS developers that work at different Enterprise level organisations in Melbourne, Australia. He has worked with/ made apps for NBN, Telstra, Westpac to name a few. He has written several books related to iOS development on topics like Lua, Swift, Objective-C, Xcode, Bash and now SwiftUI. His early days can be dated back to working with Z80 assembly, dBase, Clipper, FoxPro, Visual Basic and even RPG on AS/400.

He has experience in several domains. His love of code can see him dive deep hands-on into code. He is involved with the community and speaks at meetups and conferences, has worked in 3 major universities in Australia and teaches Swift to budding developers. He has also taught Swift to an Apple Education cohort.

He can be reached on Linked in at https://www.linkedin.com/in/jayantvarma/

About the Technical Reviewer

Mehul Mohan

is an independent developer and security researcher who likes to work with code and create things with it. He runs codedamn ( https://www.youtube.com/codedamn ) as the platform to share his work with others, and also runs codedamn.com as an independent developer platform for learning and connecting. Hes mostly into JavaScript and its runtimes but is eager to explore other interesting technologies. WWDC19 scholar, SwiftUI video series, and author of two books, you can find him using the handle @mehulmpt almost everywhere.

Jayant Varma 2019

J. Varma SwiftUI for Absolute Beginners https://doi.org/10.1007/978-1-4842-5516-2_1

1. What Is SwiftUI

Jayant Varma

(1)

Melbourne, VIC, Australia

In this chapter, we'll review the principles of SwiftUI and why it came into being. You'll see the advantages that it offers over traditional methodologies of development and how easy it is to write UI without having to worry much about it in a much more declarative manner.

The Beginnings

Every year, WWDC is always a source of exciting stuff for developers; everyone waits with baited breath to see what new tech is being introduced by Apple. Historically, WWDC, which is the Developers Conference, has been the forum where numerous new and interesting technologies have been previewed for release in some time. The most current groundbreaking piece of tech released by Apple was in 2014 when Apple released Swift, an alternative to the aging Objective-C. This not only had an easier syntax and was based on modern programming fundamentals but was also open sourced. Five years have passed since then and several books and apps are now created using Swift. This year in 2019, at WWDC, Apple released something that got developers all excited once again, called SwiftUI (Figure ). Though this is still a new technology and at the time of writing the book still in beta, it can have some changes which would only add more functionality to the existing repertoire of SwiftUI.

Figure 1-1 Applications built using SwiftUI on Mac iOS and WatchOS In a - photo 3

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