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Home > Mobile > iOS Development > Swift Cookbook
Swift Cookbook
Swift Cookbook

Swift Cookbook: Over 50 hands-on recipes to help you create apps, solve problems, and build your portfolio of projects in Swift

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Swift Cookbook

Chapter 2. Standard Library and Collections

In this chapter, we will cover the following topics:

  • Creating HTML manually
  • Printing your object description
  • Quizzing the user
  • Searching for perfect numbers
  • Sorting an array of products
  • Finding the way out
  • Working with sets
  • Creating your own set
  • Organizing a dinner room

Introduction

It's important to know the usage of collections and standard library, mainly for those people who come from Objective-C because there are some changes here.

In this chapter, we will create some apps to use these features. After these recipes, you should have good knowledge about the Swift programming language.

As mentioned in the previous chapter, most of our recipes will be created on iOS, but you can develop them on Mac OS X if you want.

Creating HTML manually

HTML started as a simple format for displaying web pages and links. Nowadays, this format has become very common and it is used everywhere. There are even frameworks such as PhoneGap that create applications with this file type.

In this recipe, we will create HTML using only strings; the main idea is to know about string manipulation. In this case, we will create the HTML code for a visiting card.

Getting ready

Open your Xcode and create a single view project called Chapter2 HTML.

How to do it...

Let's create HTML manually by following these steps:

  1. Let's click on the storyboard and add the following layout:
    How to do it...
  2. Then, connect the text fields with the following properties on the view controller:
    @IBOutlet var nameTextField: UITextField!
@IBOutlet var addressTextField: UITextField!
@IBOutlet var postCodeTextField: UITextField!
@IBOutlet var phoneTextField: UITextField!
  3. Link these properties with the corresponding text field on the view, and before creating an action button...

Printing your object description

The idea of this recipe is to see the Swift way to create a string using variable values. In Objective-C, we have a class method called stringWithFormat, but this method isn't used in Swift with the same frequency as it is used in Objective-C because now we have interpolation. In this example, we will create an app, which will show to the user three possible products. When the user chooses one of them, the app must show the information of this product and also its price if it's available.

How to do it...

  1. Create a new single view project called Chapter2 Product Value. Now, let's click on the storyboard and add three buttons, as shown here:
    How to do it...
  2. Once you've done this, you can add a new swift file called Product. Now, we will create a class with a product name, its price, and the manufacturer name.

    In this case, the only information that can be omitted is the product price; the other attributes are not optional. This means that we will need an initializer...

Quizzing the user

Sometimes, we need to add some icons on our application, but depending on the icon you want, it's not necessary to add an image; you can use Unicode characters. Let's create a quiz app using strings alone.

The idea for this app is to create an app where the user needs to answer a question in 12 seconds. After the last quiz, the app will show to the user his score, such as the number of well-answered and badly-answered questions.

Getting ready

Once we know the concept of this program, let's create a new project and name it Chapter 2 Unicode.

How to do it...

To create a quiz app, follow these steps:

  1. First, let's create a new file called Quiz and add a class with a question to it, with three possible answers and the right answer, as follows:
    class Quiz {
    var question:String
    // First possible answer
    var ①:String
    // second possible answer
    var ②:String
    // third possible answer
    var ③:String
    // Right answer
   ...

Searching for perfect numbers

Believe it or not, when computers were born as giant calculators, and until now, their main function was to do powerful calculation. Let's add a little bit of math to our Swift project to create an app that will look for the first perfect number and show it to the user.

The main question you probably have now is: what's a perfect number? A perfect number is a positive integer that is equal to the sum of its divisors. For example, 6 is a perfect number because if you sum its divisors (1 + 2 + 3), its result is 6.

In this recipe, we will learn how to use the range operators.

Getting ready

Let's start by creating a new Swift project called Chapter2 Perfect Number.

How to do it...

Follow these steps to search for perfect numbers:

  1. Click on the storyboard and create a layout similar to the one shown here:
    How to do it...
  2. Now, let's link the text fields with the following properties:
        @IBOutlet var startText: UITextField!
    @IBOutlet var endText: UITextField!
  3. Good...

Sorting an array of products

In this recipe, we will learn how to manage an array in Swift. Here, we will create an array of products (very typical), add products to it, remove unavailable products, and sort the array by price.

Getting ready

Create a new Swift single view project called Chapter 2 SortingProduct.

How to do it...

Let's create and sort an array of products by following these steps:

  1. Before we start with the view part, let's create the model part of our application. In our case, we will create the Product class. So, create a new file called Product.swift and type the following code:
    class Product: Printable {
    var name:String
    var price:Double
    var available:Bool
    
    init(name:String, price:Double, available:Bool){
        self.name = name
        self.price = price
        self.available = available
    }
    
    var description: String {
        return "\(self.name): \(self.price)£ available: \(self.available)"
    }
}
  2. As you can see, the idea...

Introduction

It's important to know the usage of collections and standard library, mainly for those people who come from Objective-C because there are some changes here.

In this chapter, we will create some apps to use these features. After these recipes, you should have good knowledge about the Swift programming language.

As mentioned in the previous chapter, most of our recipes will be created on iOS, but you can develop them on Mac OS X if you want.

Creating HTML manually

HTML started as a simple format for displaying web pages and links. Nowadays, this format has become very common and it is used everywhere. There are even frameworks such as PhoneGap that create applications with this file type.

In this recipe, we will create HTML using only strings; the main idea is to know about string manipulation. In this case, we will create the HTML code for a visiting card.

Getting ready

Open your Xcode and create a single view project called Chapter2 HTML.

How to do it...

Let's create HTML manually by following these steps:

  1. Let's click on the storyboard and add the following layout:

  2. Then, connect the text fields with the following properties on the view controller:

    @IBOutlet var nameTextField: UITextField!
@IBOutlet var addressTextField: UITextField!
@IBOutlet var postCodeTextField: UITextField!
@IBOutlet var phoneTextField: UITextField!

  3. Link these properties with the corresponding text field on the view, and before creating an action button, we will...

Printing your object description

The idea of this recipe is to see the Swift way to create a string using variable values. In Objective-C, we have a class method called stringWithFormat, but this method isn't used in Swift with the same frequency as it is used in Objective-C because now we have interpolation. In this example, we will create an app, which will show to the user three possible products. When the user chooses one of them, the app must show the information of this product and also its price if it's available.

How to do it...

  1. Create a new single view project called Chapter2 Product Value. Now, let's click on the storyboard and add three buttons, as shown here:

  2. Once you've done this, you can add a new swift file called Product. Now, we will create a class with a product name, its price, and the manufacturer name.

    In this case, the only information that can be omitted is the product price; the other attributes are not optional. This means that we will need an initializer with at least...

Quizzing the user

Sometimes, we need to add some icons on our application, but depending on the icon you want, it's not necessary to add an image; you can use Unicode characters. Let's create a quiz app using strings alone.

The idea for this app is to create an app where the user needs to answer a question in 12 seconds. After the last quiz, the app will show to the user his score, such as the number of well-answered and badly-answered questions.

Getting ready

Once we know the concept of this program, let's create a new project and name it Chapter 2 Unicode.

How to do it...

To create a quiz app, follow these steps:

  1. First, let's create a new file called Quiz and add a class with a question to it, with three possible answers and the right answer, as follows:

    class Quiz {
    var question:String
    // First possible answer
    var ①:String
    // second possible answer
    var ②:String
    // third possible answer
    var ③:String
    // Right answer
    var 👌:Int
    
    init(question:String,...
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Description

If you are an experienced Objective-C programmer and are looking for quick solutions to many different coding tasks in Swift, then this book is for you. You are expected to have development experience, though not necessarily with Swift.

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Apr 30, 2015
Length: 392 pages
Edition : 1st
Language : English
ISBN-13 : 9781784391898
Vendor :
Apple
Category :
Mobile
Languages :
Swift
Concepts :
iOS Development

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Product Details

Publication date : Apr 30, 2015
Length: 392 pages
Edition : 1st
Language : English
ISBN-13 : 9781784391898
Vendor :
Apple
Category :
Mobile
Languages :
Swift
Concepts :
iOS Development

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Table of Contents

12 Chapters
1. Getting Started with Xcode and Swift Chevron down icon Chevron up icon
1. Getting Started with Xcode and Swift
Introduction
Installing Xcode from the App Store
Downloading the Xcode image
Starting a Swift project
Using Swift project options
Creating conditional code
Adding a developer account
Compiling from the command line
Using Swift as an interpreter
Adding a control version system to an existing project
2. Standard Library and Collections Chevron down icon Chevron up icon
2. Standard Library and Collections
Introduction
Creating HTML manually
Printing your object description
Quizzing the user
Searching for perfect numbers
Sorting an array of products
Finding the way out
Working with sets
Creating your own set
Organizing a dinner room
3. Using Structs and Generics Chevron down icon Chevron up icon
3. Using Structs and Generics
Introduction
Creating an exam app
Checking the right answer
Avoiding copying of structs
Creating a generic array initializer
Creating a priority list
Creating a protocol for the priority queue
4. Design Patterns with Swift Chevron down icon Chevron up icon
4. Design Patterns with Swift
Introduction
Writing into a log file
Creating a factory of musical notes
Simulating a home automation
Delivering some pizzas
5. Multitasking Chevron down icon Chevron up icon
5. Multitasking
Introduction
Working of a device while you navigate
Creating an SEO app
Being aware of cyclones
Links on our website
6. Playground Chevron down icon Chevron up icon
6. Playground
Introduction
Creating the first playground
Watching some graphics
Watching the temperature
Stretching an image
Beautifying your text
Receiving JSONs
Dangerous moves
7. Swift Debugging with Xcode Chevron down icon Chevron up icon
7. Swift Debugging with Xcode
Introduction
The Tax income simulator
The best checker movement
Debugging with LLDB
Profiling an app
8. Integrating with Objective-C Chevron down icon Chevron up icon
8. Integrating with Objective-C
Introduction
Calling a cab
Hiring a van
Porting from one language to another
Replacing the UI classes
Upgrading the app delegate
Creating a framework
9. Dealing with Other Languages Chevron down icon Chevron up icon
9. Dealing with Other Languages
Introduction
Using your old address book
Compressing a message
Using assembly code with Swift
Sharing C++ code with Swift
10. Data Access Chevron down icon Chevron up icon
10. Data Access
Introduction
Creating an SQLite database
Checking where your IP is from
Tracking your phone activity
Controlling your stock
Voting devices
11. Miscellaneous Chevron down icon Chevron up icon
11. Miscellaneous
Introduction
The geekest keyboard
Time to take your pill
Adding effects to your photos
Being a film critic
Leaving breadcrumbs
Exchanging money
Index Chevron down icon Chevron up icon
Index

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Rating distribution
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(1 Ratings)
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William C Turner May 26, 2015
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This is a book that I was waiting for. I had preordered it. When it was released I was not disappointed. Like all the books I published by Packt Publishing, it is well written, and has an excellent presentation. The subject matter is presented in an understandable manner with excellent examples and code that really works. With a new language like Swift, there is a real need for training that addresses real world examples. This is such a book. Cecil Costa knows his subject and more importantly he knows how to present it in clear examples that are complex enough to have meaning. The book is fascinating and I found I learned something with nearly every page. The book will also serve as a reference book that I know I will go back to many times for clear examples of best practices. I highly recommend this book for anyone wishing to develop apps for IOS using Swift. It is reasonably price and tremendous value for money.
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About the author

Profile icon Costa
Costa
Cecil Costa, also know as Eduardo Campos in Latin countries, is a Euro-Brazilian freelance developer who has been learning about computers since getting his first PC 286 in 1990. From then on, he kept learning about programming languages, computer architecture, and computer science theory. Learning is his passion as well as teaching; this is the reason why he worked as a trainer a books author. He has been giving on-site courses for companies such as Ericsson, Roche, TVE (a Spanish television channel), and lots of other companies. He is also the author of the book Swift Cookbook first edition, Swift 2 Blueprints and Reactive Swift Programming. Nowadays, Cecil Costa teaches through online platforms, helping people from every part of the world. In 2008, he founded his own company, Conglomo Limited (www.conglomo.es), which offers development and training programs both on site and online. Over his professional career, he has created projects by himself and also worked for different companies, from small to big ones, such as IBM, Qualcomm, Spanish Lottery, and DIA%. He develops a variety of computer languages (such as Swift, C++, Java, Objective-C, JavaScript, Python, and so on) in different environments (iOS, Android, Web, Mac OS X, Linux, Unity, and so on) because he thinks that a good developer needs to learn every kind of programming language to open his mind, and only then will he really know what development is. Nowadays, Cecil is based in the UK, where he is progressing in his professional career, working as an iOS Team Lead. I would like to thank mr George Boole for making everything true or false and to Leonard Kleinrock for creating the idea of internet.
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Our eBooks are currently available in a variety of formats such as PDF and ePubs. In the future, this may well change with trends and development in technology, but please note that our PDFs are not Adobe eBook Reader format, which has greater restrictions on security.

You will need to use Adobe Reader v9 or later in order to read Packt's PDF eBooks.

What are the benefits of eBooks? Chevron down icon Chevron up icon
  • You can get the information you need immediately
  • You can easily take them with you on a laptop
  • You can download them an unlimited number of times
  • You can print them out
  • They are copy-paste enabled
  • They are searchable
  • There is no password protection
  • They are lower price than print
  • They save resources and space
What is an eBook? Chevron down icon Chevron up icon

Packt eBooks are a complete electronic version of the print edition, available in PDF and ePub formats. Every piece of content down to the page numbering is the same. Because we save the costs of printing and shipping the book to you, we are able to offer eBooks at a lower cost than print editions.

When you have purchased an eBook, simply login to your account and click on the link in Your Download Area. We recommend you saving the file to your hard drive before opening it.

For optimal viewing of our eBooks, we recommend you download and install the free Adobe Reader version 9.