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Wally Wang - Beginning iPhone Development with SwiftUI: Exploring the iOS SDK

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Wally Wang Beginning iPhone Development with SwiftUI: Exploring the iOS SDK
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Tame the power of Apples new user interface toolkit, SwiftUI. Integrate all the interface elements iOS users have come to know and love, such as buttons, switches, pickers, toolbars, and sliders with less effort and more efficiency. Youll also learn about touch gestures, lists, and grids for displaying data on a user interface. And youll even go beyond those simple controls to liven up any user interface with simple animation techniques. Spice your designs up with movement, scaling, and resizing, including spring and bounce effects!

Youll start with basic designs and then explore more sophisticated ones. Assuming little or no working knowledge of the Swift programming language, and written in a friendly, easy-to-follow style, this book offers a comprehensive course in iPhone and iPad programming. The book starts with a gentle introduction to using Xcode and then guides you though the creation of your first simple application. Youll create user interfaces for that application using multiple screens in two different waysusing Navigation View and Tab Bars.

Beginning iPhone Development with Swift UI covers the basic information you need to get up and running quickly to turn your great ideas into working iOS apps with stunningly interactive interfaces using SwiftUI. Once youre ready, move on to Pro iPhone Development with Swift UI to learn more of the unique aspects of iOS programming and the Swift language.

What You Will Learn

  • Discover the basics of designing a user interface using SwiftUI
  • Build cool, crisp user interfaces that use animation
  • Display data in lists and outlines
  • Organize user interfaces in forms and groups

Who This Book is For

Aspiring iOS app developers new to the Apple Swift programming language and/or the iOS SDK.

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Book cover of Beginning iPhone Development with SwiftUI Wally Wang - photo 1
Book cover of Beginning iPhone Development with SwiftUI
Wally Wang
Beginning iPhone Development with SwiftUI
Exploring the iOS SDK
6th ed.
Logo of the publisher Wally Wang San Diego CA USA ISBN - photo 2
Logo of the publisher
Wally Wang
San Diego, CA, USA
ISBN 978-1-4842-7817-8 e-ISBN 978-1-4842-7818-5
https://doi.org/10.1007/978-1-4842-7818-5
Wally Wang 2022
This work is subject to copyright. All rights are solely and exclusively licensed 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.
The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use.
The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, expressed or implied, with respect to the material contained herein or for any errors or omissions that may have been made. The publisher remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

This Apress imprint is published by the registered company APress Media, LLC part of Springer Nature.

The registered company address is: 1 New York Plaza, New York, NY 10004, U.S.A.

Any source code or other supplementary material referenced by the author in this book is available to readers on GitHub: https://github.com/Apress/Beginning-iPhone-Development-with-SwiftUI. For more detailed information, please visit http://www.apress.com/source-code.

Table of Contents
About the Author
Wally Wang

is a former Windows enthusiast who took one look at Vista and realized that the future of computing belonged to the Mac. Hes written more than 40 computer books, including Microsoft Office for Dummies, Beginning Programming for Dummies, Steal This Computer Book, My New Mac, and My New iPad. In addition to programming the Mac and iPhone/iPad, he also performs stand-up comedy, having appeared on A&Es An Evening at the Improv and having performed in Las Vegas at the Riviera Comedy Club at the Riviera Hotel & Casino. When hes not writing computer books or performing stand-up comedy, he enjoys blogging about screenwriting at his site, The 15 Minute Movie Method, where he shares screenwriting tips with other aspiring screenwriters who all share the goal of breaking into Hollywood.

About the Technical Reviewer
Wesley Matlock

is a published author of books about iOS technologies. He has more than 20 years of development experience in several different platforms. He first started doing mobile development on the Compaq iPAQ in the early 2000s. Today, Wesley enjoys developing on the iOS platform and bringing new ideas to life for Major League Baseball in the Denver metro area.

The Author(s), under exclusive license to APress Media, LLC, part of Springer Nature 2022
W. Wang Beginning iPhone Development with SwiftUI https://doi.org/10.1007/978-1-4842-7818-5_1
1. Understanding iOS Programming
Wally Wang
(1)
San Diego, CA, USA
All programming involves the same task of writing commands for a computer to follow. To learn iOS programming, you need to learn three different skills:
  • How to write commands in the Swift programming language

  • How to use Apples software frameworks

  • How to create user interfaces in Xcode

You need to write commands in the Swift programming language to make your app do something unique. Then you rely on Apples software frameworks to handle common tasks such as detecting touch gestures or accessing the camera. Finally, you use Xcode to design your apps user interface.

You want to rely on Apples software frameworks as much as possible because this lets you perform common tasks without writing (and testing) your own Swift code. By relying on Apples software frameworks, you can focus solely on the unique features of your app rather than the mundane details of making an app use different hardware features of an iPhone or iPad.

Ideally, you want your user interface to look good by adapting to all different screen sizes such as an iPhone, iPad, or iPod Touch. The user interface lets you display information to the user and retrieve information from the user. The best user interface is one that doesnt require even thinking about.

Essentially, every iOS app consists of three parts as shown in Figure :
  • Your code to make an app do something useful

  • A user interface that you can design visually in Xcode

  • Access to hardware features of an iOS device through one or more of Apples iOS framework

Figure 1-1 The three parts of an iOS app Apple provides dozens of frameworks - photo 3
Figure 1-1

The three parts of an iOS app

Apple provides dozens of frameworks for iOS (and their other operating systems as well such as macOS, watchOS, and tvOS). By simply using Apples frameworks , you can accomplish common tasks by writing little code of your own. Some of Apples available frameworks include
  • SwiftUI User interface and touch screen support

  • ARKit Augmented reality features

  • Core Animation Displays animation

  • GameKit Creates multiplayer interactive apps

  • Contacts Accesses the Contacts data on an iOS device

  • SiriKit Allows the use of voice commands through Siri

  • AVKit Allows playing of audio and video files

  • MediaLibrary Allows access to images, audio, and video stored on an iOS device

  • CallKit Provides voice calling features

Apples frameworks essentially contain code that you can reuse. This makes apps more reliable and consistent while also saving developers time by using proven code that works correctly. To see a complete list of Apples available software frameworks, visit Apples Developer Documentation site ( https://developer.apple.com/documentation ).

Apples frameworks can give you a huge head start in creating an iOS app, but you still need to provide a user interface so users can interact with your app. While you could create a user interface from scratch, this would also be tedious, time-consuming, and error-prone. Even worse, if every app developer created a user interface from scratch, no two iOS apps would look or work exactly the same, confusing users.

Thats why Apples Xcode compiler helps you design user interfaces with standard features used in most apps such as views (windows on the screen), buttons, labels, text fields, and sliders. In Xcode, each window of a user interface is called a view. While simple iOS apps may consist of a single view (think of the calculator app on an iPhone), more sophisticated iOS apps consist of multiple views.

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