Programming iOS 14 Using Swift UI Get Started With Swift 5 and Xcode - Programming Ebook

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Thursday, December 10, 2020

Programming iOS 14 Using Swift UI Get Started With Swift 5 and Xcode

Programming iOS 14 Using Swift UI Get Started With Swift 5 and Xcode
Programming iOS 14 


Book Details 
             TitleProgramming iOS 14 Using Swift UI Get Started With Swift 5 and Xcode
         Author: Gary Elmer
    Language: English
        SubjectSwift / Computers & Technology / Programming / Apple Programming
No. of pages: 141
         Format: PDF

CHAPTER ONE

WELCOME TO SWIFTUI

Apple announced the Swift programming language at its 2014 Worldwide Developers Conference (WWCD). Before Swift, Apple used the Objective – C programming language to develop apps for all of its devices (iOS, tvOS, watchOS, maOS and the iPadOS). Apple uses SwiftUI, as a substitute to Objective-C, as an innovative means of designing responsive user interfaces across all of their platforms. Although Swift can be used on many platforms, it is especially a handy program of choice for building applications on Apple devices – ranging from devices that run on WatchOS, MacOS, tvOS and the most popular OS that runs iPhone (iOS). Swift UI understands what a device user doesn’t understand. SwiftUI understands what every button on your device is working for and how it can be tapped, and it also entails how device users’ enter texts on their devices.

SwiftUI By Tutorials Ray Wenderlich

For developers, developing an app is the act of writing Swift codes to control SwiftUI. Swift is a language that says “I want a text field here, a button over there and an image at this place” while the SwiftUI is the exact part of the whole design that actually knows how draw that text at the exact place, hot to make that button and exactly how show that image at the right place.

In summary, Swift is an exciting programming language that you can use to build apps for Apple Watch, iPhone, iPad, Mac, Apple TV and lots more.

This guide will take you on an expensive tour to building the latest Apple’s iOS 14 applications using the SwiftUI, Xcode 12 (which is the latest Xcode) and the Swift 5 Programming language (Swift 5.3).

Before we go in depth into the real deal of designing iOS 14 with Swift, let us take a brief look at the Swift 5.3 programming language as it is an updated Swift language compared to the 4.2 released in 2017.

THE SWIFT 5.3 PROGRAMMING LANGUAGE

The Swift 5.3 Basic

Why Swift?

Swift, Apple’s newest programming language, has been designed for iOS, watchOS, tvOS and macOS app development. Most readers who have used Objective-C programming language before will find Swift language very familiar.

Swift has its own types of all of the basic C and Objective-C types; ranging from Int for integers, Bool for Boolean values, String for textual data and the Double and Float for floating-point values.

Like the C programming language, Swift deploys variables to refer to values and store them. Swift, like most programming languages, makes good use of variables that don’t change values. Constants are variables with unchanging values. Swift’s constants are actually more useful and powerful than the constant in C language. Swift utilizes constants all through to make codes used in the development of apps clearer and safer in usage and intent.

Along with some familiar types common to both Swift and many popular languages in programming, Swift now introduces advanced types called tuples which was not obtainable in Objective C programming language (Apple uses the objective C language before Swift in 2014). With Tuples, you will be able to build and use values that have been grouped. A tuple, normally, can be utilized to return many values from any function as one compound value.

Swift also brings, with its many features, an optional type that help to handle the lack of a value. The optionals imply either “there is presence of a value which is equal to X” or “no value exists”. The optionals in the Swift language are much like the nil with pointers for the Objective-C programming, only that the optional is applicable for any type, and not only for classes. Unlike the nil pointers in the Objective-C, the Swift’s optionals are much safer and expressive and they are at the interface of many of Swift’s most useful features.

Swift can be regarded as a type-safe programming language; this implies that the language gives you a clear shot of the categories of values that can actually work with your code. Let us say some areas in your code need a String data type, safety will not allow you to mistakenly give it an Int data type. In the same vein, the type safety capability in Swift prevents users from

mistakenly giving an optional String data type to a particular piece of code needing a non-optional String. With the type safety in Swift, it becomes especially very easy to see and fix errors in codes during the development phase once they are spotted. 



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