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Home > Mobile > iOS Development > Swift 4 Programming Cookbook
Swift 4 Programming Cookbook
Swift 4 Programming Cookbook

Swift 4 Programming Cookbook: 50 task-oriented recipes to maximise Swift 4 productivity

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Swift 4 Programming Cookbook

Building on the Building Blocks

In this chapter, we will cover the following recipes:

  • Bundling variables into tuples
  • Ordering your data with arrays
  • Containing your data with sets
  • Storing key-value pairs with Dictionaries
  • Subscripts for custom types
  • Changing your name with typealias
  • Getting property changing notifications using property observers
  • Controlling access with access control
  • Extending functionality with extensions

Introduction

The last chapter gave us the basic types that form the building blocks of the Swift language. Now we will build on top of this knowledge to create more complex structures using functionalities provided by the Swift standard library.

All the code for this chapter can be found in the GitHub repository at https://github.com/SwiftProgrammingCookbook/BuildingOnTheBuildingBlocks.

Bundling variables into tuples

A tuple is a combination of two or more values that can be treated as one. If you have ever wished you could return more than one value from a function or method, you should find tuples very interesting.

Getting ready

Create a new playground and add the following statement:

import Foundation

This example uses one function from Foundation. We will delve into Foundation in more detail in Chapter 5, Beyond the Standard Library, but for now, we just need to import it.

How to do it...

Let's say that we are building an app that pulls together...

Ordering your data with arrays

In this chapter, and the last, we were introduced to many different Swift constructs: classes, structs, enums, closures, protocols, and tuples. Yet, rarely will we be dealing with these on their own; we will likely have many instances of these constructs, and we need a way to collect multiple instances in useful data structures. We will examine three collection data structures provided by Swift: arrays, sets, and Dictionaries (often called hash tables in other languages):

In the next few recipes, we'll look at how to use them to store and access elements, and examine their relative characteristics.

How to do it...

First, let's investigate arrays, which are an ordered list of elements...

Containing your data with sets

The next collection type we will look at is a set. Sets differ from arrays in two important ways. The elements in a set are stored unordered, and each unique element is only held once. In this recipe, we will look at how we can create and manipulate sets.

How to do it...

Let's take a look at the following steps:

  1. First, let's look at how sets only store unique elements:
let fibonacciArray: Array<Int> = [1, 1, 2, 3, 5, 8, 13, 21, 34] 
let fibonacciSet: Set<Int> = [1, 1, 2, 3, 5, 8, 13, 21, 34] 
print(fibonacciArray.count) // 10 
print(fibonacciSet.count) // 9
  1. Elements can be inserted and removed, and you can check whether a set contains an element using the following:
var...

Storing key-value pairs with Dictionaries

The last collection type we will look at is the Dictionary, which is a familiar construct in programming languages, where it is sometimes referred to as a hash table. A dictionary holds a collection of pairings between a key and a value. The key can be any element that conforms to the Hashable protocol (just like elements in a set), and the value can be any type. The contents of a Dictionary are not stored in order, unlike an array; instead, the key is used both when storing a value and as a lookup when retrieving a value.

Getting ready

In this recipe, we will use a Dictionary to store details of people at a place of work. We need to store and retrieve a person's information based...

Subscripts for custom types

From the last few recipes on collection types, we have seen, that their elements are accessed through subscripts. However, it's not just collection types that can have subscripts; your own custom types can provide subscript functionality too.

Getting ready

Let's create a simple game of tic-tac-toe, also known as Noughts and Crosses. To do this, we need a three-by-three grid of positions, with each position being filled by either a nought from Player 1, a cross from Player 2, or nothing. We can store these positions in an array of arrays.

The initial game setup code uses the constructs we covered earlier, so we won't go into its implementation. Enter the following code into a new playground...

Changing your name with typealias

The typealias declaration allows you to create an alias for a type; it does exactly what it says on the tin. You can specify a name that can be used in place of any given type definition. If this type is quite complex, a typealias can be a useful way to simplify its use.

How to do it...

Let's take look at the following steps to understand how to use typealias:

  1. First, let's create something to store in an array--in this instance, a Pug struct:
struct Pug { 
    let name: String 
}
  1. Now we can create an array that will contain instances of a Pug struct:
let pugs = [Pug]()
As you may or may not know, the collective noun for a group of pugs is called a grumble.
https://www.reference...

Getting property changing notifications using property observers

You may often find that you would like to know when a property changes its value; maybe you want to update the value of another property, or inform a delegate. In Objective-C, this was often accomplished by writing your own getter and setter, or using Key-Value observing (KVO), but we have native support for property observers in Swift.

Getting ready

To examine property observers, we should create an object with a property that we want to observe. Let's create an object to manage users and a property to hold the current user's name:

class UserManager { 
    var currentUserName: String = "Emmanuel Goldstein" 
}

We want to present some friendly...

Controlling access with access control

Swift provides fine-grained access control, allowing you to specify the visibility that your code has to the other areas of code. This enables you to be explicit about the interface you provide to other parts of the system, encapsulating implementation logic and helping to separate the areas of concern.

Swift has five access levels:

  • Private: Only accessible within the existing scope (defined by curly brackets) or extensions in the same file
  • File private: Accessible to anything in the same file, but nothing outside the file
  • Internal: Accessible to anything in the same module, but nothing outside the module
  • Public: Accessible both inside and outside the module, but cannot be subclassed or overwritten outside of the defining module
  • Open: Accessible everywhere, with no restrictions on its use

These can be applied to types, properties, and functions...

Extending functionality with extensions

Extensions let us add functionalities to the existing classes, structs, enums, and protocols. This can be especially useful when the original type is provided by an external framework, and therefore you aren't able to add a functionality directly.

Getting ready

Imagine that we often need to obtain the first word from a given string. Rather than repeatedly writing the code to split the string into words and then retrieving the first word, we can extend the functionality of String to provide its own first word.

How to do it...

...
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Key benefits

  • Write robust and efficient code and avoid common pitfalls using Swift 4
  • Get a comprehensive coverage of the tools and techniques needed to create multi-platform apps with Swift 4
  • Packed with easy-to-follow recipes, this book will help you develop code using the latest version of Swift

Description

Swift 4 is an exciting, multi-platform, general-purpose programming language. Being open source, modern and easy to use has made Swift one of the fastest growing programming languages. If you interested in exploring it, then this book is what you need. The book begins with an introduction to the basic building blocks of Swift 4, its syntax and the functionalities of Swift constructs. Then, introduces you to Apple's Xcode 9 IDE and Swift Playgrounds, which provide an ideal platform to write, execute, and debug the codes thus initiating your development process. Next, you'll learn to bundle variables into tuples, set order to your data with an array, store key-value pairs with dictionaries and you'll learn how to use the property observers. Later, explore the decision-making and control structures in Swift and learn how to handle errors in Swift 4. Then you'll, examine the advanced features of Swift, generics and operators, and then explore the functionalities outside of the standard library, provided by frameworks such as Foundation and UIKit. Also, you'll explore advanced features of Swift Playgrounds. At the end of the book, you'll learn server-side programming aspect of Swift 4 and see how to run Swift on Linux and then investigate Vapor, one of the most popular server-side frameworks for Swift.

Who is this book for?

If you are looking for a book to help you learn about the diverse features offered by Swift 4 along with tips and tricks to efficiently code and build applications, then this book is for you. Basic knowledge of Swift or general programming concepts will be beneficial.

What you will learn

  • Explore basic to advanced concepts in Swift 4 Programming
  • Unleash advanced features of Apple s Xcode 9 IDE and Swift Playgrounds
  • Learn about the conditional statements, loops, and how to handle errors in Swift
  • Define flexible classes and structs using Generics, and learn about the advanced operators, and create custom operators
  • Explore functionalities outside of the standard libraries of Swift
  • Import your own custom functionality into Swift Playgrounds
  • Run Swift on Linux and investigate server-side programming with the server side framework Vapor
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Publication date : Sep 28, 2017
Length: 384 pages
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Language : English
ISBN-13 : 9781786460899
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Category :
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Concepts :
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ISBN-13 : 9781786460899
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Category :
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Languages :
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Concepts :
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Tools :
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Table of Contents

8 Chapters
Swift Building Blocks Chevron down icon Chevron up icon
Swift Building Blocks
Introduction
Your first Swift program
Strings, Ints, Floats, and Bools
Optionals, unwrap, and force unwrap
Functions
Object classes
Structs
Enumerations
Closures
Protocols
Building on the Building Blocks Chevron down icon Chevron up icon
Building on the Building Blocks
Introduction
Bundling variables into tuples
Ordering your data with arrays
Containing your data with sets
Storing key-value pairs with Dictionaries
Subscripts for custom types
Changing your name with typealias
Getting property changing notifications using property observers
Controlling access with access control
Extending functionality with extensions
Data Wrangling with Swift Control Flow Chevron down icon Chevron up icon
Data Wrangling with Swift Control Flow
Introduction
Making decisions with if/else
Switch it up
For the love of loops
While loops
Try, throw, do and, catch - Swift error handling
Checking up front with guard
Doing it later with defer
Bailing out with fatalError and precondition
Generics, Operators, and Nested Types Chevron down icon Chevron up icon
Generics, Operators, and Nested Types
Introduction
Using generics with types
Using generics with functions
Using generics with protocols
Advanced operators
Option set
Create custom operators
Nested types
Beyond the Standard Library Chevron down icon Chevron up icon
Beyond the Standard Library
Introduction
Foundation
Networking
JSON
XML
Cocoa Touch
Swift Playgrounds Chevron down icon Chevron up icon
Swift Playgrounds
Introduction
Using Swift Playgrounds for UI
Import Resources into Playgrounds
Import Code into Playgrounds
Multi-Page Playgrounds
Server-Side Swift Chevron down icon Chevron up icon
Server-Side Swift
Introduction
Swift on Ubuntu
Building a REST API using Vapor
Persistence with Vapor using Postgres
Hosting your Vapor app on Heroku
Performance and Responsiveness in Swift Chevron down icon Chevron up icon
Performance and Responsiveness in Swift
Introduction
Value and reference semantics
Dispatch Queues
Concurrent queues and dispatch groups
Operations

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Customer reviews

Rating distribution
Full star icon Full star icon Full star icon Full star icon Half star icon 4.4
(5 Ratings)
5 star 60%
4 star 20%
3 star 20%
2 star 0%
1 star 0%
m c m Jul 19, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
cooking
Amazon Verified review Amazon
Mark Bridges Oct 31, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Really great book for anyone wanting to learn more about Swift, or iOS in general for that matter. Everything’s split up into small ordered ‘recipes’ so it’s easy to quickly refer to things you want to know a bit more about. I feel as though I finally have a clear understanding of the difference between the ‘heap’ and the ‘stack’.
Amazon Verified review Amazon
Kathleen M Moon Aug 29, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
easy to follow - very helpful
Amazon Verified review Amazon
Lionel Carre Mar 16, 2018
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Je suis au chapitre 4, j'ai trouvé une petite erreur mais j'ai beaucoup appris. Il me faudra un autre livre pour la programmation des fonctions OS. Mais pour la programmation Swift 4, ce livre est suffisant
Amazon Verified review Amazon
mrbennopolis Nov 04, 2017
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Overall it's a good book, Mr Moon clearly knows the material and has a more sophisticated pedagogical style as these types of writers go. However, the book has typo after typo after typo. To the extent that it's rather annoying and even confuses the concepts he is attempting to convey at points. I don't know if Packt has never heard of copy editing or just don't have any employees who know how to do it. Out of the 100 or so technical books I've read in my life this quite easily is the one with the most grammatical errors. Hopefully they can get their act together reduce this sort of thing going forward. I wouldn't let this stop you from buying the book but it will be a significant annoyance as you work through it.
Amazon Verified review Amazon

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Cancellation Policy for Published Printed Books:

You can cancel any order within 1 hour of placing the order. Simply contact customercare@packt.com with your order details or payment transaction id. If your order has already started the shipment process, we will do our best to stop it. However, if it is already on the way to you then when you receive it, you can contact us at customercare@packt.com using the returns and refund process.

Please understand that Packt Publishing cannot provide refunds or cancel any order except for the cases described in our Return Policy (i.e. Packt Publishing agrees to replace your printed book because it arrives damaged or material defect in book), Packt Publishing will not accept returns.

What is your returns and refunds policy? Chevron down icon Chevron up icon

Return Policy:

We want you to be happy with your purchase from Packtpub.com. We will not hassle you with returning print books to us. If the print book you receive from us is incorrect, damaged, doesn't work or is unacceptably late, please contact Customer Relations Team on customercare@packt.com with the order number and issue details as explained below:

  1. If you ordered (eBook, Video or Print Book) incorrectly or accidentally, please contact Customer Relations Team on customercare@packt.com within one hour of placing the order and we will replace/refund you the item cost.
  2. Sadly, if your eBook or Video file is faulty or a fault occurs during the eBook or Video being made available to you, i.e. during download then you should contact Customer Relations Team within 14 days of purchase on customercare@packt.com who will be able to resolve this issue for you.
  3. You will have a choice of replacement or refund of the problem items.(damaged, defective or incorrect)
  4. Once Customer Care Team confirms that you will be refunded, you should receive the refund within 10 to 12 working days.
  5. If you are only requesting a refund of one book from a multiple order, then we will refund you the appropriate single item.
  6. Where the items were shipped under a free shipping offer, there will be no shipping costs to refund.

On the off chance your printed book arrives damaged, with book material defect, contact our Customer Relation Team on customercare@packt.com within 14 days of receipt of the book with appropriate evidence of damage and we will work with you to secure a replacement copy, if necessary. Please note that each printed book you order from us is individually made by Packt's professional book-printing partner which is on a print-on-demand basis.

What tax is charged? Chevron down icon Chevron up icon

Currently, no tax is charged on the purchase of any print book (subject to change based on the laws and regulations). A localized VAT fee is charged only to our European and UK customers on eBooks, Video and subscriptions that they buy. GST is charged to Indian customers for eBooks and video purchases.

What payment methods can I use? Chevron down icon Chevron up icon

You can pay with the following card types:

  1. Visa Debit
  2. Visa Credit
  3. MasterCard
  4. PayPal
What is the delivery time and cost of print books? Chevron down icon Chevron up icon

Shipping Details

USA:

'

Economy: Delivery to most addresses in the US within 10-15 business days

Premium: Trackable Delivery to most addresses in the US within 3-8 business days

UK:

Economy: Delivery to most addresses in the U.K. within 7-9 business days.
Shipments are not trackable

Premium: Trackable delivery to most addresses in the U.K. within 3-4 business days!
Add one extra business day for deliveries to Northern Ireland and Scottish Highlands and islands

EU:

Premium: Trackable delivery to most EU destinations within 4-9 business days.

Australia:

Economy: Can deliver to P. O. Boxes and private residences.
Trackable service with delivery to addresses in Australia only.
Delivery time ranges from 7-9 business days for VIC and 8-10 business days for Interstate metro
Delivery time is up to 15 business days for remote areas of WA, NT & QLD.

Premium: Delivery to addresses in Australia only
Trackable delivery to most P. O. Boxes and private residences in Australia within 4-5 days based on the distance to a destination following dispatch.

India:

Premium: Delivery to most Indian addresses within 5-6 business days

Rest of the World:

Premium: Countries in the American continent: Trackable delivery to most countries within 4-7 business days

Asia:

Premium: Delivery to most Asian addresses within 5-9 business days

Disclaimer:
All orders received before 5 PM U.K time would start printing from the next business day. So the estimated delivery times start from the next day as well. Orders received after 5 PM U.K time (in our internal systems) on a business day or anytime on the weekend will begin printing the second to next business day. For example, an order placed at 11 AM today will begin printing tomorrow, whereas an order placed at 9 PM tonight will begin printing the day after tomorrow.


Unfortunately, due to several restrictions, we are unable to ship to the following countries:

  1. Afghanistan
  2. American Samoa
  3. Belarus
  4. Brunei Darussalam
  5. Central African Republic
  6. The Democratic Republic of Congo
  7. Eritrea
  8. Guinea-bissau
  9. Iran
  10. Lebanon
  11. Libiya Arab Jamahriya
  12. Somalia
  13. Sudan
  14. Russian Federation
  15. Syrian Arab Republic
  16. Ukraine
  17. Venezuela